CN110460641A - Data transmission method, apparatus and system - Google Patents

Abstract

The application discloses a data transmission method, device and system, belonging to the field of computer communication. The method includes: the first target server sends instruction information of the first initial server to the client; the client sends a secondary TCP request for establishing a secondary TCP link to the second initial server according to the instruction information, and the secondary TCP request carries the instruction information ; When the second initial server is different from the first initial server indicated by the indication information, the second TCP request is forwarded to the first initial server; the first initial server forwards the second TCP request to the first target server; the first target server is based on After receiving the second TCP request, send the response of the second TCP request to the client. This application guarantees the establishment of the MPTCP link.

Description

Data transmission method, device and system

technical field

The present application relates to the field of computer communication, in particular to a data transmission method, device and system.

Background technique

With the rise of mobile Internet communications, clients usually support data transmission over multiple links. For example, the various links may include a link based on a long term evolution (long term evolution, LTE) technology, a link based on a wireless fidelity (wirelessfidelity, WIFI) technology, and the like. Therefore, in order to reasonably utilize the various links, a multipath transport control protocol (multipath transport control, MPTCP) that uses multiple paths to transmit data concurrently emerges as the times require. Since the load balance (LB) technology is widely used in communication, MPTCP based on the LB technology also rises accordingly.

In the current MPTCP based on the four-layer LB technology, the data transmission system usually includes: a client, multiple initial servers, and multiple target servers. Wherein, the client can establish an MPTCP link with the target server, and the MPTCP link includes a primary transmission control protocol (transport control, TCP) link and a secondary TCP link established between the client and the target server. When the client establishes the main TCP link with the target server, the client can send the request of the main TCP link to an initial server randomly selected among multiple initial servers, and the initial server receiving the request will receive the request in the Send to a randomly selected target server among multiple target servers. Afterwards, the target server that receives the request sends a response to the request to the client, so that the client establishes a primary TCP link with the target server. After the client and the target server establish a primary TCP link, the client can also establish a secondary TCP link with the target server, and the client can send a request for the secondary TCP link to an initial server randomly selected among multiple initial servers , the initial server receiving the request resends the received request to a randomly selected target server among the multiple target servers. Afterwards, the target server that receives the request sends a response to the request to the client, so that the client establishes a secondary TCP link with the target server.

Since the MPTCP link requires all its TCP links to be links between the client and the same target server, and the request sent by the client for establishing the primary TCP link and the request for establishing the secondary TCP link in the related art The request may be forwarded to different initial servers, and then forwarded to different target servers. Therefore, the established primary TCP link and secondary TCP link may fail to form an MPTCP link.

Contents of the invention

The present application provides a data transmission method, device and system, which can solve the problem that the MPTCP link may not be formed in the related art.

In a first aspect, a data transmission method is provided, which is applied to a data transmission system, and the data transmission system includes a client, a plurality of initial servers, and a plurality of target servers, and the method includes: sending the first target server to the client Sending indication information of a first initial server, wherein both the first initial server and the first target server are located on the main transmission control protocol TCP link established by the client, and the first initial server is the Any initial server among the multiple initial servers; the client sends a secondary TCP request for establishing a secondary TCP link to a second initial server according to the indication information, wherein the second initial server is one of the multiple initial servers For any initial server in the server, the secondary TCP link and the primary TCP link belong to the same multipath transmission control protocol MPTCP link, and the secondary TCP request carries the indication information; for example, the secondary The TCP request includes an address identification field, and the address identification field carries indication information of the first initial server. When the second initial server is different from the first initial server indicated by the indication information, forward the secondary TCP request to the first initial server; the first initial server forwards the secondary TCP request to the first initial server; The request is forwarded to the first target server; based on receiving the secondary TCP request, the first target server sends a response to the secondary TCP request to the client.

In this way, since the first target server sends the indication information of the first initial server on the primary TCP link to the client, the client can carry the indication information in the secondary TCP request, so that the second initial server receives the After the TCP request, the secondary TCP request may be forwarded to the first initial server based on the indication information, so that the first initial server forwards the secondary TCP request to the server receiving the primary TCP request. It ensures that the target server on the primary TCP link and the target server on the secondary TCP link are the same target server, thereby ensuring the establishment of the MPTCP link and realizing load balancing under the MPTCP link.

It should be noted that, the above description takes the second initial server and the first initial server as an example, and when the second initial server is the same as the first initial server indicated by the indication information, the The secondary TCP request is forwarded to the first target server.

Optionally, before the first target server sends the indication information of the first initial server to the client, the client may send a main TCP request to the first target service, and the sending process includes: the client sending a primary TCP request for establishing the primary TCP link to the first initial server, and the first initial server forwards the primary TCP request to the first target server. It is worth noting that the above process of the first target server sending the indication information of the first initial server to the client may include: the first target server sending a response to the main TCP request to the client, The response of the main TCP request carries the indication information.

In this way, through the response of the main TCP request carrying the instruction information of the first initial server, there is no need to send the instruction information separately, saving network bandwidth and improving the compatibility of the data transmission method. Certainly, the above-mentioned process of the first target server sending the indication information of the first initial server to the client may also be: the first target server respectively sends to the client a response to the main TCP request that does not carry the above indication information, and this instruction.

Optionally, the indication information may be the identifier of the first initial server, or may be information indicating the identifier of the first initial server. This embodiment of the present application is described by taking the indication information including the identifier of the first initial server as an example. Exemplarily, the identifier of the initial server may be a user identification (UserIdentification, UID) of the initial server, and the UID may be data of any size, for example, 8-bit (bit) data. Wherein, each of the multiple target servers is configured with a corresponding relationship between the identifiers and addresses of the multiple initial servers. The address of the initial server may be an IP address or a Media Access Control Address (Media Access Control Address, MAC), which is not limited in this embodiment of the present application.

The process of the first initial server forwarding the main TCP request to the first target server may include: the first initial server processes the main TCP request, so that the processed main TCP The request carries the address of the first initial server. The first initial server sends the processed main TCP request to the first target server.

Further, before the first target server sends the indication information of the first initial server to the client, the method further includes: the first target server obtains the first initial server carried in the main TCP request. The address of the server. The first target server determines the identifier of the first initial server based on the address of the first initial server and the correspondence between identifiers and addresses of the plurality of initial servers.

Optionally, each of the multiple initial servers may also be configured with a corresponding relationship between identifiers and addresses of the multiple initial servers. When the above-mentioned second initial server is different from the first initial server indicated by the indication information, the process of the second initial server forwarding the secondary TCP request to the first initial server may include:

The second initial server first obtains the identifier of the first initial server carried in the secondary TCP request. Then, the second initial server determines the address of the first initial server based on the identifier of the first initial server and the correspondence between identifiers and addresses of the plurality of initial servers. Finally, the second initial server sends the secondary TCP request to the first initial server based on the address of the first initial server.

In this way, since each initial server can forward the secondary TCP request to the initial server on the primary TCP link according to the identification of the initial server on the primary TCP link carried in the secondary TCP request, so that all TCP requests are sent by The same origin server forwards to the destination server. Therefore, when the LB cluster is in the active-active mode, there is no need for additional information synchronization between the LB clusters in related technologies, which reduces the difficulty of implementing the LB cluster working in the active-active mode, and realizes the LB cluster in the active-active mode in the MPTCP scenario. Load balancing.

Optionally, the primary TCP request carries the key of the MPTCP, and the secondary TCP request carries token information for indicating the key, and the method further includes: sending Before the main TCP request is forwarded to the first target server, the first initial server establishes a correspondence between the key and the first target server. Correspondingly, before the first initial server forwards the secondary TCP request to the first target server, the first initial server searches for the corresponding relationship between the key and the first target server The first target server corresponding to the key indicated by the token information.

It should be noted that, since the client and the initial server in the data transmission system establish a communication connection through a transit device, therefore, the sending of the main TCP request by the client to the first initial server may include: the client passes through the transit The device sends the primary TCP request to the first initial server. Correspondingly, the process of the client sending a secondary TCP request to the second initial server according to the indication information may also include: the client sends a secondary TCP request to the second initial server through the transit device according to the indication information ask.

In a second aspect, a data transmission method is provided, the data transmission method is used for a client in a data transmission system, the data transmission system further includes: a plurality of initial servers and a plurality of target servers, and the method includes:

The client receives indication information of the first initial server among the multiple initial servers sent by the first target server among the multiple target servers, wherein both the first target server and the first initial server are located at the client Establish the master Transmission Control Protocol on the TCP link. The client sends a secondary TCP request for establishing a secondary TCP link to a second initial server according to the indication information, where the second initial server is any initial server among the plurality of initial servers, and the secondary The TCP link and the primary TCP link belong to the same MPTCP link, and the secondary TCP request carries the indication information. The client receives a response to the second TCP request sent by the first target server.

As an optional implementation manner, before the client receives the indication information of the first initial server sent by the first target server, the method further includes: the client sends an A master TCP request to establish the master TCP link.

The process for the client to receive the indication information of the first of the multiple initial servers sent by the first target server among the multiple target servers may include: the client receiving the main TCP request sent by the first target server A response of the main TCP request carries the indication information.

Optionally, since the communication connection between the client and the initial server is established through the transfer device in the data transfer system, the data transfer system further includes the transfer device. At this time, the process of the client sending the primary TCP request for establishing the primary TCP link to the first initial server may include: the client sends the Master TCP request. The process for the client to send a secondary TCP request for establishing a secondary TCP link to the second initial server according to the indication information may include: the client sends a request to the second initial server through the transit device according to the indication information TCP requests.

In a third aspect, a data transmission method is provided, the data transmission method is used for a third initial server in a data transmission system, the data transmission system includes a client, multiple initial servers, and multiple target servers, the third The initial server is any initial server among the plurality of initial servers, and the method includes: the third initial server receives a secondary TCP request for establishing a secondary TCP link sent by other devices, wherein the other devices include: The client or any server in the multiple initial servers except the third initial server, the secondary TCP request carries indication information, and the indication information is used to indicate that the multiple initial servers The initial server located on the primary TCP link established by the client in the server, the secondary TCP link and the primary TCP link belong to the same multipath transmission control protocol MPTCP link; the third initial server is at When it is different from the initial server indicated by the indication information, forward the secondary TCP request to the initial server indicated by the indication information.

Optionally, when the third initial server is the same as the initial server indicated by the indication information, forward the secondary TCP request to the first target server, and the first target server is the plurality of target servers The target server located on the primary TCP link.

Optionally, before the third initial server receives a secondary TCP request sent by other devices to establish a secondary TCP link, the method further includes: the third initial server receives a request sent by the client to establish the primary TCP link. For the main TCP request of the TCP link, the initial server indicated by the indication information is the third initial server; the third initial server forwards the main TCP request to the first target server.

Optionally, the indication information includes an identifier of the third initial server, and each of the plurality of target servers is configured with a correspondence between the identifiers and addresses of the plurality of initial servers;

The third initial server forwarding the main TCP request to the first target server includes: the third initial server processing the main TCP request, so that the processed main TCP request carries The address of the third initial server; the third initial server sends the processed main TCP request to the first target server.

Optionally, the indication information carries an identifier of the indicated initial server, and each of the plurality of initial servers is configured with a correspondence between the identifiers and addresses of the plurality of initial servers;

When the third initial server is different from the initial server indicated by the indication information, forwarding the secondary TCP request to the initial server indicated by the indication information includes: acquiring the indication by the third initial server The identification of the initial server carried in the information; the third initial server determines the initial server indicated by the indication information based on the acquired identification of the initial server and the correspondence between the identifications and addresses of the plurality of initial servers address; the third initial server sends the secondary TCP request to the initial server indicated by the indication information based on the address of the initial server indicated by the indication information.

Optionally, the primary TCP request carries the key of the MPTCP, and the secondary TCP request carries token information for indicating the key, and the method further includes: sending Before the primary TCP request is forwarded to the first target server, the third initial server establishes the corresponding relationship between the key and the first target server; Before forwarding to the first target server, the third initial server searches for the first key corresponding to the key indicated by the token information in the corresponding relationship between the key and the first target server. a target server.

Optionally, the data transmission system further includes a transfer device; the third initial server receives the main TCP request sent by the client to establish the main TCP link, including: the third initial server through the The transit device receives the main TCP request sent by the client.

The third initial server receives a secondary TCP request for establishing a secondary TCP link sent by other devices, including: when the other device is the client, the third initial server receives the client through the transit device A secondary TCP request sent by the peer to establish a secondary TCP link.

Optionally, the secondary TCP request includes an address identification field, and the address identification field carries the indication information.

In a fourth aspect, a data transmission method is provided, the data transmission method is used for a first target server in a data transmission system, the data transmission system includes a client, multiple initial servers, and multiple target servers, and the first A target server is a server located on the main TCP link established by the client among the plurality of target servers, and the method includes:

The first target server sends indication information of a first initial server to the client, where the first initial server is: an initial server located on the primary TCP link among multiple initial servers. The first target server receives a secondary TCP request for establishing a secondary TCP link sent by the first initial server, and the secondary TCP link and the primary TCP link belong to the same MPTCP link. The first target server sends a response to the secondary TCP request to the client based on the secondary TCP request.

Optionally, before the first target server sends the indication information of the first initial server to the client, the method further includes: the first target server receives the establishment of the Primary TCP request for the primary TCP link.

It is worth noting that the above process of the first target server sending the indication information of the first initial server to the client may include: the first target server sending a response to the main TCP request to the client, The response of the main TCP request carries the indication information.

In this way, through the response of the main TCP request carrying the instruction information of the first initial server, there is no need to send the instruction information separately, saving network bandwidth and improving the compatibility of the data transmission method.

Certainly, the above-mentioned process of the first target server sending the indication information of the first initial server to the client may also be: the first target server respectively sends to the client a response to the main TCP request that does not carry the above indication information, and this instruction.

Optionally, the indication information may be the identifier of the first initial server, or may be information indicating the identifier of the first initial server. This embodiment of the present application is described by taking the indication information including the identifier of the first initial server as an example. Exemplarily, the identifier of the initial server may be a user identification (UserIdentification, UID) of the initial server, and the UID may be data of any size, for example, 8-bit (bit) data.

Wherein, each of the multiple target servers is configured with a corresponding relationship between the identifiers and addresses of the multiple initial servers.

Then before the first target server sends the indication information of the first initial server to the client, the method further includes: the first target server first obtains the first initial server carried by the main TCP request the address of. Then, the first target server determines the identifier of the first initial server based on the address of the first initial server and the correspondence between the identifiers and addresses of the multiple initial servers.

In a fifth aspect, a data transmission system is provided, the data transmission system includes a client, multiple initial servers, and multiple target servers,

The first target server is used to send the indication information of the first initial server to the client, wherein both the first initial server and the first target server are located on the main transmission control protocol TCP link established by the client Above, the first initial server is any initial server among the plurality of initial servers; the client is configured to send a secondary TCP request for establishing a secondary TCP link to the second initial server according to the indication information, wherein , the second initial server is any initial server in the plurality of initial servers, the secondary TCP link and the primary TCP link belong to the same multipath transmission control protocol MPTCP link, and the secondary TCP request carrying the indication information; the second initial server is used to forward the secondary TCP request to the first initial server when it is different from the first initial server indicated by the indication information; the The first initial server is configured to forward the secondary TCP request to the first target server; the first target server is configured to send the secondary TCP request to the client based on receiving the secondary TCP request response.

Optionally, the second initial server is configured to forward the secondary TCP request to the first target server when it is the same as the first initial server indicated by the indication information.

Optionally, the client is configured to, before the first target server sends the indication information of the first initial server to the client, send the primary TCP link for establishing the primary TCP link to the first initial server. request; the first initial server is used to forward the main TCP request to the first target server;

The first target server is configured to send a response to the main TCP request to the client, where the response to the main TCP request carries the indication information.

Optionally, the indication information includes an identifier of the first initial server, and each of the plurality of target servers is configured with a correspondence between the identifiers and addresses of the plurality of initial servers;

The first initial server is used to process the main TCP request, so that the processed main TCP request carries the address of the first initial server; A target server sends the processed main TCP request;

The first target server is used to obtain the address of the first initial server carried in the main TCP request before the first target server sends the indication information of the first initial server to the client; The first target server is configured to determine the identifier of the first initial server based on the address of the first initial server and the correspondence between the identifiers and addresses of the plurality of initial servers.

Optionally, the indication information includes an identifier of the first initial server, and each of the plurality of initial servers is configured with a correspondence between the identifiers and addresses of the plurality of initial servers;

The second initial server is used to obtain the identifier of the first initial server carried in the secondary TCP request;

The second initial server is configured to determine the address of the first initial server based on the identifier of the first initial server and the correspondence between the identifiers and addresses of the plurality of initial servers;

The second initial server is configured to send the secondary TCP request to the first initial server based on the address of the first initial server.

Optionally, the address of the initial server includes an Internet Protocol IP address.

Optionally, the secondary TCP request includes an address identification field, and the address identification field carries indication information of the first initial server.

Optionally, the primary TCP request carries the MPTCP key, and the secondary TCP request carries token information indicating the key,

The first initial server is configured to establish a correspondence between the key and the first target server before the first initial server forwards the main TCP request to the first target server;

The first initial server is used to search the corresponding relationship between the key and the first target server before the first initial server forwards the secondary TCP request to the first target server. The first target server corresponding to the key indicated by the token information.

Optionally, the data transmission system further includes a transfer device;

The client is used to send the main TCP request to the first initial server, including: the client is used to send the main TCP request to the first initial server through the transit device;

The client is configured to send a secondary TCP request to the second initial server according to the indication information, including: the client is configured to send the secondary TCP request to the second initial server through the transit device according to the indication information.

In a sixth aspect, a data transmission device is provided for a client in a data transmission system, the data transmission system further includes: a plurality of initial servers and a plurality of target servers, and the data transmission device includes: a first receiving module, a sending module and Second receiving module.

The first receiving module is configured to receive indication information of the first initial server among the multiple initial servers sent by the first target server among the multiple target servers, wherein both the first target server and the first initial server are located in the main server established by the client Transmission Control Protocol TCP link;

A sending module, configured to send a secondary TCP request for establishing a secondary TCP link to a second initial server according to the instruction information, wherein the second initial server is any initial server in a plurality of initial servers, and the secondary TCP link is connected to the primary TCP link The paths belong to the same multipath transmission control protocol MPTCP link, and the secondary TCP request carries indication information;

The second receiving module is configured to receive a response to the secondary TCP request sent by the first target server.

Optionally, the data transmission device further includes: a sending main request module, configured to send to the first initial server before receiving indication information of the first initial server among the multiple initial servers sent by the first target server among the multiple target servers A master TCP request to establish a master TCP link.

The first receiving device is further configured to: receive a response to the main TCP request sent by the first target server, where the response to the main TCP request carries indication information.

Optionally, the data transmission system further includes a transfer device.

The module for sending the main request is also used for: sending the main TCP request to the first initial server through the transit device.

The sending module is further configured to: send a secondary TCP request to the second initial server through the transfer device according to the indication information.

In a seventh aspect, a data transmission device is provided, the data transmission device is used for a third initial server in a data transmission system, the data transmission system includes a client, a plurality of initial servers and a plurality of target servers, the third The initial server is any initial server among the multiple initial servers, and the device includes: a receiving module and a forwarding module.

A receiving module, configured to receive a secondary TCP request for establishing a secondary TCP link sent by other devices, wherein the other devices include: the client or the multiple initial servers except the third initial server Any server, the secondary TCP request carries indication information, and the indication information is used to indicate the initial server located on the primary TCP link established by the client among the multiple initial servers, the secondary TCP The link and the main TCP link belong to the same multipath transmission control protocol MPTCP link;

A forwarding module, configured to forward the secondary TCP request to the initial server indicated by the indication information when the third initial server is different from the initial server indicated by the indication information.

Optionally, the data transmission device further includes: a forwarding secondary request module, configured to forward the secondary TCP request to the first target server when the third initial server is the same as the initial server indicated by the indication information, The first target server is a target server located on the main TCP link among the multiple target servers.

Optionally, the data transmission device further includes: a module for receiving the main request and a module for forwarding the main request.

The receiving primary request module is configured to receive the primary TCP request for establishing the primary TCP link sent by the client before the third initial server receives the secondary TCP request for establishing the secondary TCP link sent by other devices, The initial server indicated by the indication information is the third initial server;

A forwarding main request module, configured to forward the main TCP request to the first target server.

Optionally, the indication information includes an identifier of the third initial server, and each of the multiple target servers is configured with a correspondence between the identifiers and addresses of the multiple initial servers.

The forwarding main request module is further configured to process the main TCP request, so that the processed main TCP request carries the address of the third initial server; Describe the main TCP request.

Optionally, the indication information carries an identifier of the indicated initial server, and each of the plurality of initial servers is configured with a correspondence between the identifiers and addresses of the plurality of initial servers. The forwarding module is further configured to obtain the identifier of the initial server carried in the instruction information; based on the obtained identifier of the initial server and the corresponding relationship between the identifiers and addresses of the plurality of initial servers, determine the The address of the indicated initial server; based on the address of the initial server indicated by the indication information, sending the secondary TCP request to the initial server indicated by the indication information.

Optionally, the primary TCP request carries the key of the MPTCP, and the secondary TCP request carries token information for indicating the key. The data transmission device also includes: a building module and a searching module.

An establishment module, configured to establish a correspondence between the key and the first target server before the third initial server forwards the main TCP request to the first target server;

A search module, configured to search for the third initial server in the corresponding relationship between the key and the first target server before the third initial server forwards the secondary TCP request to the first target server The first target server corresponding to the key indicated by the token information.

Optionally, the data transmission system further includes a relay device; a main request receiving module, further configured to receive the master TCP request sent by the client through the relay device.

The receiving secondary request module is further configured to receive a secondary TCP request for establishing a secondary TCP link sent by the client through the transit device when the other device is the client.

Optionally, the secondary TCP request includes an address identification field, and the address identification field carries the indication information.

In an eighth aspect, a data transmission device is provided, which is used for a first target server in a data transmission system, the data transmission system includes a client, a plurality of initial servers and a plurality of target servers, and the first target server is a plurality of target servers In the server located on the main TCP link established by the client, the data transmission device includes: a first sending module, a receiving module and a second sending module.

The first sending module is configured to send the indication information of the first initial server to the client, wherein the first initial server is: an initial server located on the main TCP link among the multiple initial servers.

The receiving module is configured to receive a secondary TCP request for establishing a secondary TCP link sent by the first initial server, and the secondary TCP link and the primary TCP link belong to the same MPTCP link.

The second sending module is configured to send a response of the secondary TCP request to the client based on the secondary TCP request.

Optionally, the data transmission device further includes: a main request receiving module, configured to receive a main TCP request for establishing a main TCP link forwarded by the first initial server before sending the indication information of the first initial server to the client.

The first sending module is further configured to: the first target server sends a response to the main TCP request to the client, and the response to the main TCP request carries indication information.

Optionally, the indication information includes an identifier of the first initial server, and multiple target servers are configured with correspondences between identifiers and addresses of multiple initial servers. The data transmission device also includes: an acquisition module and a determination module.

An acquisition module, configured to acquire the address of the first initial server carried in the main TCP request before sending the indication information of the first initial server to the client;

The determining module is configured to determine the identifier of the first initial server based on the address of the first initial server and the correspondence between identifiers and addresses of multiple initial servers.

In a ninth aspect, a computer-readable storage medium is provided. Instructions are stored in the computer-readable storage medium. When the instructions are run on a computer, the computer is made to execute any one of the above-mentioned second aspect to the fourth aspect. The data transmission method described.

In a tenth aspect, a computer program product containing instructions is provided, and when the computer program product is run on a computer, the computer is made to execute the data transmission method described in any one of the above-mentioned second aspect to the fourth aspect.

The beneficial effects brought by the technical solution provided by this application may at least include:

In the data transmission method, device and system provided by the embodiments of the present application, since the first target server sends the indication information of the first initial server on the primary TCP link to the client, the client can carry the indication in the secondary TCP request Information, so that after the second initial server receives the TCP request, it can forward the TCP request to the first initial server based on the indication information, so that the first initial server forwards the secondary TCP request to the server receiving the primary TCP request. server. It ensures that the target server on the primary TCP link and the target server on the secondary TCP link are the same target server, thereby ensuring the establishment of the MPTCP link and realizing load balancing under the MPTCP link.

Description of drawings

Fig. 1 is a kind of structural representation of the data transmission system that applies four-layer load balancing technology that the application provides;

Fig. 2 is a schematic structural diagram of a data transmission system applying seven-layer load balancing technology provided by the present application;

FIG. 3 is a flow chart of a data transmission method provided by the present application;

FIG. 4 is a flow chart of a data transmission method provided by the present application;

FIG. 5 is a flowchart of another data transmission method provided by the present application;

FIG. 6 is a block diagram of a data transmission device provided by the present application;

FIG. 7 is a block diagram of a data transmission device provided by the present application;

FIG. 8 is a block diagram of another data transmission device provided by the present application;

FIG. 9 is a block diagram of another data transmission device provided by the present application;

FIG. 10 is a block diagram of another data transmission device provided by the present application;

FIG. 11 is a block diagram of another data transmission device provided by the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

A data transfer system usually includes a client and a destination server. Wherein, the client has multiple ports (ports), and the client can select one of the multiple ports as the source port, and establish a TCP link with the target server through the source port, and then realize the connection with the target server through the TCP link. Single-path data transfer between servers. However, the bandwidth performance between the client and target server is limited by this single path, and this TCP link is not highly available.

With the rise of mobile Internet communications, clients usually support data transmission over multiple links. For example, the various links may include a TCP link based on LTE technology (LTE-TCP link for short), a TCP link based on WIFI technology (WIFI-TCP link for short), and the like. Both LTE technology and WIFI technology are limited by factors such as network coverage and signal strength. Therefore, the link between the client and the target server may be switched under the above two TCP links, or may include the above two TCP links at the same time. Among them, when the link between the client and the target server includes the above two TCP links at the same time, the data transmission efficiency and network bandwidth between the client and the target server (the network bandwidth refers to the data transmitted in a unit time amount) is higher. Based on this, MPTCP, which uses multiple paths to transmit data concurrently, came into being. The path (path) refers to the whole process from the starting point (that is, the sending end, such as the client) to the end point (that is, the receiving end, such as the target server). routing.

The following will describe the establishment process of the MPTCP link based on the data transmission system:

Assuming that the client has port A and port B in the data transmission system, port A may be an LTE network port, and port B may be a WIFI network port. The MPTCP between the client and the target server may include a primary TCP link and a secondary TCP link, and the client may first establish the primary TCP link with the target server, and then establish a secondary TCP link with the target server.

On the one hand, the process of establishing the primary TCP link between the client and the target server may include: the client sends a primary TCP request to the target server through port A, and the primary TCP request may be a SYN message. The multi-path capability (MP_CAPABLE) field is carried in the SYN message, and the MP_CAPABLE field is used to indicate that the client supports the MPTCP link, and the MP_CAPABLE field contains the key (key) of the MPTCP link generated by the client, the key Used to identify the MPTCP link. After receiving the SYN message, the target server sends a response to the main TCP request to the client, and the response to the main TCP request may be a SYNACK message. The MP_CAPABLE field is carried in the SYN ACK message, and the MP_CAPABLE field is used to indicate that the target server supports the MPTCP link. After receiving the response of the main TCP request sent by the target server, the client sends an ACK message to the target server. The ACK message carries an MP_CAPABLE field, which is used to indicate that both the client and the target server support MPTCP connections, and the MP_CAPABLE field includes the key of the MTTPCP link generated by the client. So far, the establishment of the main TCP link is completed.

On the other hand, the process of establishing a secondary TCP link between the client and the target server may include: the client sends a secondary TCP request to the server through port B, and the secondary TCP request may be a SYN message. The SYN message carries a multipath join (MP_JOIN) field and a token (token) field. Wherein, the MP_JOIN field is used to indicate that the client supports MPTCP connection, and the token field can be used to indicate the key of the above-mentioned MTTPTCP link. After receiving the SYN message, the target server sends a response to the TCP request to the client, and the response to the TCP request may be a SYN ACK message. The SYN ACK message carries the MP_JOIN field. After receiving the SYN ACK message sent by the target server, the client sends an ACK message to the target server, and the ACK message carries the MP_JOIN field. After receiving the ACK message sent by the client, the target server sends an ACK message to the client. The ACK message is a TCP standard ACK message, and the ACK message sent to the client indicates receipt confirmation. So far, the establishment of the secondary TCP link is completed.

Further, since the LB technology is widely used in communication, the MPTCP based on the LB technology also rises accordingly. In the current MPTCP based on LB technology, the data transmission system usually includes: a client, a transit device, and multiple servers. Since the LB technology in the related art includes four-layer LB technology and seven-layer LB technology, the above-mentioned data transmission system may include different numbers of servers according to different applied LB technologies. The data transmission systems based on these two LB technologies will be described in detail below.

Please refer to FIG. 1 , which shows a schematic structural diagram of a data transmission system applying four-layer LB technology provided by an embodiment of the present application. As shown in FIG. 1 , the data transmission system applying the four-layer LB technology may include: a client 110 , a transfer device 120 and multiple servers, and the multiple servers include multiple initial servers 130 and multiple target servers 140 . Wherein, the client 110 may be an electronic device such as a mobile phone, a personal computer (personal computer, PC) or a tablet computer. The transfer device 120 may be a device with a data transfer function such as a gateway (switch) or a router. The plurality of initial servers 130 may be server clusters that provide four-tier LB services. The target server 140 may be a physical server, a virtual machine, or a container. The target server 140 is used for processing data transmitted on the MPTCP link. Further, the client 110 may be respectively connected to the transfer device 120 and the multiple target servers 140 through the network, and the transfer device 120 may be respectively connected to the multiple initial servers 130 through the network. Multiple origin servers 130 may be respectively connected to multiple target servers 140 via a network.

Please refer to FIG. 2 , which shows a schematic structural diagram of a data transmission system applying seven-layer LB technology provided by an embodiment of the present application. The data transmission system adds a layer of servers to the data transmission system shown in FIG. 1 , that is, the data transmission system using a seven-layer LB may further include: multiple backend servers 150 . Wherein, the plurality of target servers 140 may also be a server cluster of seven layers of LB servers. The plurality of backend servers 150 may be physical servers, virtual machines or containers. The plurality of backend servers 150 may be respectively connected to the plurality of target servers 140 and the client 110 through a network.

It should be noted that, the above-mentioned network in FIG. 1 and FIG. 2 may be a wired or wireless network (wireless network). Wired networks include Transmission Control Protocol/Internet Protocol (Transmission Control Protocol/Internet Protocol, TCP/IP) networks, optical fiber networks, or InfiniBand (IB) networks; wireless networks include: Wi-Fi networks, third-generation (3rd-generation , 3G) mobile communication technology network or general packet radio service technology (general packet radio service, GPRS), etc.

Exemplarily, taking a data transmission system based on four-layer LB technology as an example, when the client and the target server establish an MPTCP link, first, the client can use the primary TCP link used to establish the primary TCP link in the MPTCP link The request is sent to the transit device, wherein the main TCP request carries the key of the MPTCP link generated by the client (the key of the MPTCP link where the main TCP link is located). The main TCP request can also carry a quintuple (the quintuple includes: IP address of the sending end, port of the sending end, IP address of the receiving end, port of the receiving end, and transmission protocol), and the transfer device can carry the quintuple based on the received main TCP request. The five-tuple of determines an initial server, and forwards the main TCP request to the initial server. When the initial server receives the main TCP request, it again determines a target server based on the quintuple, and forwards the main TCP request to the target server. Afterwards, the target server sends a response to the main TCP request to the client based on the received main TCP request. Then, the client sends an acknowledgment message to the target server based on the response. So far, the establishment of the primary TCP link is completed. Afterwards, a secondary TCP link is established between the client and the target server based on a procedure similar to that of establishing the primary connection described above.

However, since the client has multiple IP addresses and multiple ports, and each time the client sends a TCP request (no matter whether it is a primary TCP request or a secondary TCP request), the used IP addresses and ports may be different, so As a result, the quintuple information carried by the primary TCP link may be different from the quintuple information carried by the secondary TCP request. Therefore, the target server determined based on the quintuple carried by the primary TCP request is different from the quintuple carried by the secondary TCP request. The target servers determined by the group may be different, which causes the target servers on the primary TCP link and the secondary TCP link to be different. However, the MPTCP link requires that the target server (that is, the backend server in the data transmission system) on the primary TCP link and the secondary TCP link be the same, so that the MPTCP link cannot be formed.

In a data transmission system based on seven-layer LB technology, after each layer of server receives a TCP request (such as a primary TCP request or a secondary TCP request), it needs to determine the device in the next layer according to the five-tuple carried by the TCP request. a device. The reason is similar to the data transmission system based on the four-layer LB technology. In the data transmission system based on the seven-layer LB technology, the initial server may forward the primary TCP request and the secondary TCP request to different target servers, resulting in the main TCP link and The target servers on the secondary TCP links are different, which leads to different backend servers forwarded by the target server. The MPTCP link requires the same target server on the primary TCP link and the secondary TCP link, which also makes it impossible to form an MPTCP link.

An embodiment of the present invention provides a data transmission method, based on which an MPTCP link can be effectively established. Please refer to FIG. 3 , which shows a flowchart of a data transmission method provided by an embodiment of the present application. The data transmission method can be applied to the data transmission system shown in FIG. 1 above, and the data transmission method can be divided into two stages: a primary TCP link establishment stage and a secondary TCP link establishment stage. As shown in Figure 3, the data transmission method may include the following steps:

The main TCP link establishment phase:

Step 101, the client sends a primary TCP request for establishing a primary TCP link to the first initial server, and the primary TCP request carries the key of the MPTCP link where the primary TCP link is located.

When the client needs to request to establish an MPTCP link with the target server, the client needs to first request the target server to establish a primary TCP link in the MPTCP link. For example, the main TCP request may be a SYN message, the SYN message carries an MP_CAPABLE field, the MP_CAPABLE field is used to indicate that the client supports MPTCP connections, and the MP_CAPABLE field includes the MPTCP link generated by the client. key. The key can be used to identify the MPTCP link.

It should be noted that, since the client and the initial server establish a communication connection through the transfer device in the data transmission system, the process of the client sending the main TCP request to the first initial server may include: the client sends the first initial server to the first initial server through the transfer device Send the main TCP request. Wherein, the first initial server is any one of multiple initial servers. After receiving the main TCP request sent by the client, the transit device may determine the first initial server based on a forwarding algorithm, and then distribute the main TCP request to the first initial server. Exemplarily, the forwarding algorithm may be an algorithm based on a five-tuple hash operation, or may also be a random allocation algorithm.

Step 102, the first initial server determines a first target server among multiple target servers.

The determining process of the first target server may include: the first initial server determines the first initial server to which the main TCP request is forwarded based on a scheduling algorithm. Exemplarily, the scheduling algorithm may be an algorithm based on a five-tuple hash operation, or may also be a random allocation algorithm.

Step 103, the first initial server establishes a corresponding relationship between the key of the MPTCP link and the first target server.

After the first initial server determines the first target server, it can establish the corresponding relationship between the key carried in the main TCP request and the above-mentioned determined first target server, so that the first initial server will receive the key carrying the same key. The TCP request of the key is forwarded to the first target server.

For example, the first initial server may record the corresponding relationship between the key of the MPTCP link and the first target server through the key-target server forwarding entry. Optionally, the forwarding entry may also record the correspondence between the key of the MPTCP link carried in the main TCP request and the quintuple. Wherein, the first target server may be the IP address of the first target server. For example, the forwarding entry may be as shown in Table 1 below.

Table 1

Quintuple key first target server quintuple 1 key 1 target server 1

As shown in Table 1, the key of the MPTCP link corresponding to quintuple 1 is key 1, and the key of the MPTCP link corresponding to the first target server is target server 1.

It should be noted that, in the above forwarding entry, only the corresponding relationship between the key of the MPTCP link carried in a main TCP request, the quintuple and the first target server is recorded. When the first initial server forwards the next main TCP request, the forwarding entry will again record the quintuple corresponding to the MPTCP key carried in the next main TCP request and the target server.

Step 104, the first initial server forwards the main TCP request to the first target server, and the main TCP request carries the address of the first initial server.

The process of the first initial server forwarding the main TCP request to the first target server may include: first processing the main TCP request by the first initial server, so that the processed main TCP request carries the address of the first initial server. Then, the first initial server sends the processed primary TCP request to the first target server.

Wherein, the processing of the TCP request by the first initial server may be: the first initial server writes the address of the first initial server into the main TCP request. Exemplarily, the main TCP request may include session initiation protocol (sessioninitiation protocol, SIP) information, and the SIP information is used to record the address of the device that forwards the main TCP request to the first initial server. When the request is processed, the SIP information in the main TCP request may be rewritten as the address of the first initial server. For example, the address of the first initial server may be an IP address, and of course the address of the first initial server may also be a media access control (media access control, MAC) address, which is not limited in this embodiment of the present application.

Step 105, the first target server obtains the address of the first initial server carried in the main TCP request.

For example, after receiving the main TCP request forwarded by the first initial server, the first target server may acquire the IP address of the first initial server from the SIP information of the main TCP request.

Step 106, the first target server determines the identifier of the first initial server based on the address of the first initial server and the correspondence between identifiers and addresses of multiple initial servers.

Multiple target servers can be configured with a corresponding relationship between addresses identified by multiple initial servers. After the first target server receives the main TCP request and determines the address of the first initial server, it can search for the first target server in the corresponding relationship. An ID of the first initial server corresponding to the address of the initial server. Exemplarily, the identifier of the initial server may be a user identification (user identification, UID) of the initial server, and the UID may be data of any size, for example, 8-bit (bit) data.

Optionally, a configuration file may be stored on each target server, and the configuration file may be used to record the correspondence between the UIDs and IP addresses of the above-mentioned multiple LB servers. For example, the content of the configuration file may be as shown in Table 2 below. Among them, the IP address corresponding to UID (00000001) is 1.75.2.128; the IP address corresponding to UID (00000010) is 1.75.2.127; the IP address corresponding to UID (00000011) is 1.75.2.126; the IP address corresponding to UID (00000100) is 1.75.2.125.

Table 2

UID IP address 00000001 1.75.2.128 00000010 1.75.2.127 00000011 1.75.2.126 00000100 1.75.2.125

It should be noted that only four pairs of correspondences between UIDs and IP addresses are recorded in the above configuration file. The embodiment of the present application does not limit the logarithm of the corresponding relationship recorded in the configuration file.

Step 107, the first target server sends a response to the main TCP request to the client, and the response to the main TCP request carries the identifier of the first initial server.

After receiving the main TCP request, the first target server needs to send a response to the main TCP request to the client, and needs to send the indication information of the first initial server to the main TCP request. In step 107, the indication information is the identity of the first initial server as an example. Optionally, the indication information may not be the identity, but information indicating the identity of the first initial server. This is not limited.

Optionally, in this embodiment of the present invention, it is taken as an example that the first target server carries the indication information of the first initial server in the response of the main TCP request. The response to the main TCP request of the indication information, and the indication information. Wherein, when the response of the main TCP request carries indication information, the response of the main TCP request may be a SYN ACK message, and the SYN ACK message carries an MP_CAPABLE field, and the MP_CAPABLE field is used to indicate that the server supports MPTCP links. The first target server carries the indication information to the client through the payload (payload) of the MP_CAPABLE field in the SYN ACK message. And, because in the related art, after the target server receives the main TCP request (that is, the SYN message), it will send a SYN ACK message to the client, therefore, the SYN ACK message carries the first initial server's The indication information does not need to be sent separately, which saves network bandwidth and improves the compatibility of the data transmission method.

It should be noted that, after the client receives the response to the main TCP request sent by the first target server, the client may send an acknowledgment message of the response to the main TCP request to the first target server, and the acknowledgment message may be an ACK message. arts. So far, the establishment of the main TCP link in the MPTCP connection is completed.

Secondary TCP link establishment phase:

Step 108, the client sends a secondary TCP request for establishing a secondary TCP link to the second initial server according to the instruction information, and the TCP request carries the identifier of the first initial server and the order for indicating the key of the MPTCP link card information.

Wherein, the second initial server is any initial server among multiple initial servers, and the secondary TCP link and the above-mentioned primary TCP link belong to the same MPTCP link. When the above indication information is not the identification of the first initial server, correspondingly, the TCP request carries indication information indicating the first initial server, and the indication information is not an identification.

In this embodiment of the present application, the process of the client sending the secondary TCP request to the second initial server may refer to the above-mentioned process of the client sending the primary TCP request to the first initial server. Exemplarily, the TCP request may be a SYN message, and the SYN message carries an MP_JOIN field and a token field. Wherein, the token field may be token information, and the token field may be used to indicate a key of the above-mentioned MPTCP link. The MP_JOIN field is used to indicate that the client supports the MPTCP link, and the MP_JOIN field includes an address identification (Address ID) field. The client may fill the above-mentioned indication information of the first initial server into the Address ID field, so that the TCP request carries the indication information of the first initial server.

In related technologies, the Address ID field in the MP_JOIN field carried by the SYN message is filled with the IP address of the client. After network address translation, the IP address filled in the Address ID field will be changed, so that the information in the Address ID field cannot accurately indicate the IP address of the client, resulting in the invalidation of the Address ID field. Therefore, in the embodiment of the present application, the reuse of the Address ID field to carry the identifier of the first initial server will not affect the original SYN message, and can improve the utilization rate of the SYN message.

Step 109, when the second initial server is different from the first initial server indicated by the indication information carried in the secondary TCP request, forward the secondary TCP request to the first initial server.

When the indication information of the first initial server includes the identifier of the first initial server, the second initial server obtains the identifier of the first initial server carried in the TCP request after receiving the second TCP request. Afterwards, the second initial server needs to determine whether the identifier is the same as the identifier of the second initial server, so as to determine whether the second initial server is the same as the first initial server. When the second initial server determines that it is different from the first initial server, the second initial server may forward the TCP request to the first initial server. The process in which the second initial server forwards the TCP request to the first initial server will be described below.

It should be noted that each initial server may store multiple correspondences between identifiers (for example, UID) and addresses (for example, IP addresses) of the initial server. For example, a configuration file may be stored on each initial server, and the configuration file may be used to record correspondence between identifiers and addresses of multiple initial servers. The above secondary TCP request may carry the identifier of the first LB server. The second initial server may first obtain the identifier of the first initial server carried in the secondary TCP request. For example, the second initial server may extract the identifier of the first initial server from the Address ID field in the SYN packet carried in the secondary TCP request. Afterwards, the second initial server may determine the address of the first initial server based on the identifier of the first initial server and the correspondence between identifiers and addresses of multiple initial servers. Finally, the second initial server may send the secondary TCP request to the first initial server based on the address of the first initial server.

Step 110, the first initial server forwards the secondary TCP request to the first target server.

After the first initial server receives the secondary TCP request sent by any initial server (such as the above-mentioned second initial server), it can first obtain the token information carried by the received secondary TCP request, and then determine the MPTCP chain based on the token information. road key. Afterwards, based on the key, the first initial server queries the corresponding relationship between the key of the previously established MPTCP link and the first target server, and then determines the first target server corresponding to the key. Finally, the first initial server forwards the TCP request to the first target server.

For example, the first initial server can determine the key of the MPTCP link based on the token field in the SYN message carried by the secondary TCP request, and then query the previously established forwarding entry according to the key, so as to determine the first key corresponding to the key. A target server, and then forward the TCP request to the determined first target server according to the first target server.

It should be noted that, in FIG. 3, the data transmission system is illustrated by taking the second initial server and the first initial server as an example. When the second initial server and the first initial server indicated by the indication information carried in the secondary TCP request At the same time, the second initial server may directly forward the secondary TCP request to the first target server. Moreover, the process of the second initial server forwarding the secondary TCP request to the first target server is the same as the above-mentioned step 110, which will not be repeated in this embodiment of the present application.

Step 111 , based on receiving the secondary TCP request, the first target server sends a response to the secondary TCP request to the client.

Wherein, the response of this TCP request may not carry the identifier of the first initial server. The response to this TCP request may be a SYN ACK message, and the SYN ACK message carries an MP_JOIN field.

It should be noted that after step 111, the client may send a first confirmation message to the first target server based on the received response of the secondary TCP request, and the first confirmation message may be an ACK message. After receiving the first confirmation message, the first target server sends a second confirmation message to the client, where the second confirmation message may be an ACK message. The ACK message sent by the first target server to the client is a TCP standard ACK message. So far, the establishment of the TCP link is completed.

It should also be noted that the data transmission method shown in FIG. 3 can also be used in the data transmission system shown in FIG. 2 . At this time, after the above step 107, the first target server determines the first backend server, and stores the relationship between the key of the MPTCP link carried in the main TCP request and the first backend server in the first target server. The first target server sends the main TCP request to the first backend server based on the correspondence. After obtaining the main TCP request, the first backend server sends a response to the TCP request to the client based on the main TCP request. After receiving the main TCP request sent by the first backend server, the client continues to execute steps 108 to 110 . After the first target server receives the secondary TCP request, the first target server forwards the secondary TCP request to the first backend server based on the key of the MPTCP link carried in the secondary TCP request and the above correspondence. After receiving the TCP request, the first backend server sends a response to the TCP request to the client. Wherein, the identifier of the first initial server may be sent to the client separately by the first target server, or may be sent by the first target server to the first backend server, and then sent to the client separately by the first backend server, or carried in the response of the main TCP request sent by the first backend server to the client, so as to be sent by the first backend server to the client. Optionally, the main TCP request also carries application layer content information, and the first target server can determine the first backend server based on a selection algorithm based on the application layer content information carried in the main TCP request, and the first backend server Any one of multiple backend servers.

To sum up, in the data transmission method provided by the embodiment of the present invention, since the first target server sends the indication information of the first initial server on the primary TCP link to the client, the client can carry the information in the secondary TCP request. indication information, so that after receiving the TCP request, the second initial server can forward the TCP request to the first initial server based on the indication information, so that the first initial server forwards the secondary TCP request to receive the primary TCP request server. It ensures that the target server on the primary TCP link and the target server on the secondary TCP link are the same target server, thereby ensuring the establishment of the MPTCP link and realizing load balancing under the MPTCP link.

Further, since the indication information of the first initial server can be carried in the relevant message of MPTCP in the related art, the data transmission method conforms to the request for comments (request for comments, RFC) specification, and avoids affecting the protocol of other devices The stack processes the data transmitted by MPTCP and has high compatibility.

To facilitate readers' understanding, the embodiments of the present application illustrate a data transmission method for a data transmission system applying the four-layer LB technology.

Suppose, in the data transmission system, the client includes an LTE network port and a WIFI network port, and the client has two different IP addresses, IP address 1 and IP address 2 . The transit device is a gateway. The initial server is an LB device, and multiple initial servers include LB device 1 (also called LB node 1 ), LB device 2 and LB device 3 . The UID of the LB device 1 is 00000001, and the IP address is 1.75.2.128; the UID of the LB device 2 is 00000010, and the IP address is 1.75.2.127; the UID of the LB device 3 is 00000011, and the IP address is 1.75.2.126. The multiple target servers include RS1, RS2 and RS3.

As shown in Figure 4, when the client establishes an MPTCP link with the target server, the client sends a main TCP request to the gateway through the IP address 1 and the LTE network port, and the main TCP request carries the MPTCP link where the main TCP link is located. key 1. After receiving the main TCP request, the gateway distributes the main TCP request to the LB device 2 based on a forwarding algorithm. After LB device 2 receives the master TCP request, LB device 2 establishes the forwarding entry shown in Table 1 above, and rewrites the SIP information content in the master TCP request to its IP address 1.75.2.127, and based on the scheduling The algorithm forwards the master TCP request to RS1.

After receiving the master TCP request, RS1 obtains the IP address 1.75.2.127 of the LB device 2 based on the master TCP request. Then, the RS1 queries the configuration file shown in Table 2 above based on the IP address, and determines that the UID of the LB device 2 is 00000010. Then RS1 sends a response to the main TCP request carrying the UID of the LB device 2 to the client, and the response to the main TCP request carries the UID of the LB device 2 . Based on this, the client completes the establishment of the main TCP link.

After the client establishes the primary TCP link with the target server, the client can establish a secondary TCP link with the target server, and the process of establishing the secondary TCP link is similar to the above process of establishing the primary TCP link. The client forwards the second TCP request to the LB device 3 through the gateway, and this TCP request carries the UID of the LB device 2 . After receiving the TCP request, the LB device 3 obtains the UID carried in the TCP request, and compares the UID with the UID of the LB device 3 . Since the two are not the same, the LB device 3 determines that the IP address corresponding to the UID is 1.75.2.127 based on the UID obtained from the second TCP request, and forwards the TCP request to 1.75.2.127, that is, forwarding to LB device 2. After receiving the TCP request, the LB device 2 forwards the TCP request to the above-mentioned RS1. Based on this, the client completes the establishment of the secondary TCP link.

In the data transmission method provided by the embodiment of the present invention, since RS1 sends the UID of the LB device 2 to the client, the client can carry the UID in the second TCP request, so that after the LB device 3 receives the TCP request, it can use the UID based on The UID forwards the TCP request to the LB device 2, so that the LB device 2 forwards the TCP request to RS1, forming an MPTCP link, and realizing load balancing under the MPTCP link.

Further, the embodiment of the present application illustrates a data transmission method for a data transmission system applying a seven-layer LB technology.

It is assumed that, in the data transmission system, both the client and the initial server are the same as the client and the initial server in the above data transmission system applying the four-layer LB technology. The target server is an LB7 device, and the multiple target servers include LB7 device 1, LB7 device 2, and LB7 device 3. The multiple backend servers include RS1, RS2 and RS3.

As shown in Figure 5, in this data transmission system, the client forwards the primary TCP request (and the secondary TCP request) to the LB7 device 1 through multiple devices. (and the secondary TCP request) are forwarded to RS1 by multiple devices, which will not be described in this embodiment of the present application.

When LB7 device 1 receives the main TCP request, LB7 device 1 not only sends the UID of LB device 2 to the client, but also sends the main TCP request to RS2 based on the forwarding algorithm. After receiving the main TCP request, RS2 sends a response to the main TCP request to the client. Based on this, the client completes the establishment of the main TCP link.

After the LB7 device 1 receives the TCP request, the LB7 device 1 does not need to send the response of the TCP request to the client, but sends the TCP request to the RS2 based on the forwarding algorithm. After receiving the TCP request, RS2 sends a response to the TCP request to the client. Based on this, the client completes the establishment of the secondary TCP link.

In the data transmission method provided by the embodiment of the present invention, since the UID of the LB device 2 sent by the LB7 device 1 to the client, the client can carry the UID in the second TCP request, so that after the LB device 3 receives the TCP request, The TCP request can be forwarded to the LB device 2 based on the UID, so that the LB device 2 forwards the TCP request to the LB7 device 1, and the LB7 device 1 forwards the TCP request to the primary TCP link The RS2 of the MPTCP link is formed, and the load balancing under the MPTCP link is realized.

It should be noted that the aforementioned multiple initial servers may form an LB cluster. The working mode of the LB cluster may belong to the active-active mode, or may belong to the active-standby mode. The active-active mode means that in the LB cluster, each initial server can forward the received TCP request to the target server. The active/standby mode means that the initial server in the LB cluster is divided into the active initial server and the standby initial server, wherein the active initial server can forward the received TCP request to the target server, and the standby initial server can normally , the received TCP request cannot be forwarded to the target server.

In related technologies, in the case where the working mode of the above-mentioned LB cluster can belong to the primary-primary mode, in order to solve the above-mentioned target server determined when the primary TCP link is established, it may not be the same as the target server determined when the secondary TCP link is established. same problem. In the process of establishing the main connection, any initial server among the multiple initial servers can additionally send the corresponding relationship between the key carried in the main TCP request and the target server after determining the target server to which the main TCP request is forwarded to each initial server in the LB cluster. At this time, in the process of establishing the secondary connection, after any initial server receives the secondary TCP request, it can determine the target server to which the primary TCP request is forwarded based on the key carried in the secondary TCP request and the corresponding relationship. Therefore, the target server determined when the primary TCP link is established is the same as the target server determined when the secondary TCP link is established. However, the technical difficulty of additional information synchronization between LB clusters is relatively large, which makes it difficult to realize that the LB clusters work in the master-master mode.

In the data transmission method provided by the embodiment of the present invention, since in the LB cluster, each initial server can forward the secondary TCP request to the primary TCP according to the identifier of the initial server on the primary TCP link carried in the secondary TCP request. The initial server on the link, so that all TCP requests are forwarded to the target server by the same initial server. Therefore, there is no need for additional information synchronization between LB clusters, which reduces the implementation difficulty of LB clusters working in master-master mode, and realizes load balancing of LB clusters in master-master mode in MPTCP scenarios.

Further, since the working mode of the LB cluster is in the active/standby mode, the primary initial server can also forward the TCP request to the initial server on the primary TCP link through the data transmission method described in the embodiment of the present application, Therefore, all TCP requests are forwarded to the target server by the same initial server. Therefore, the embodiment of the present application can also be applied to the load balancing of the LB cluster in the active/standby mode in the MPTCP scenario.

The following are device embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

An embodiment of the present application provides a data transmission device, which is used for a client in a data transmission system. The data transmission system further includes: multiple initial servers and multiple target servers. As shown in FIG. 6 , the data transmission device 200 includes: a first A receiving module 201 , a sending module 202 and a second receiving module 203 .

The first receiving module 201 is configured to receive indication information of the first initial server among the multiple initial servers sent by the first target server among the multiple target servers, wherein both the first target server and the first initial server are located in the client-established On the main transmission control protocol TCP link;

The sending module 202 is configured to send a secondary TCP request for establishing a secondary TCP link to the second initial server according to the indication information, wherein the second initial server is any initial server in a plurality of initial servers, and the secondary TCP link is connected to the primary TCP link. The link belongs to the same multipath transmission control protocol MPTCP link, and the secondary TCP request carries indication information;

The second receiving module 203 is configured to receive a response to the secondary TCP request sent by the first target server.

Optionally, as shown in FIG. 7 , the data transmission device 200 further includes: a sending main request module 204, configured to receive indication information of the first initial server among the multiple initial servers sent by the first target server among the multiple target servers Before, send a master TCP request to establish a master TCP link to the first initial server.

The first receiving means 201 is further configured to: receive a response to the main TCP request sent by the first target server, where the response to the main TCP request carries indication information.

Optionally, the data transmission system further includes a transfer device.

The sending main request module 204 is further configured to: send the main TCP request to the first initial server through the transit device.

The sending module 202 is further configured to: send the secondary TCP request to the second initial server through the transfer device according to the indication information.

An embodiment of the present application provides a data transmission device, the data transmission device is used for a third initial server in a data transmission system, the data transmission system includes a client, multiple initial servers, and multiple target servers, and the third initial server is multiple Any initial server in the initial servers, as shown in FIG. 8 , the data transmission device 300 includes: a receiving module 301 and a forwarding module 302.

The receiving module 301 is configured to receive a secondary TCP request for establishing a secondary TCP link sent by other devices, wherein the other devices include: any server in the client or multiple initial servers except the third initial server, the secondary TCP request carries indication information, and the indication information is used to indicate the initial server located on the primary TCP link established by the client among the multiple initial servers, and the secondary TCP link and the primary TCP link belong to the same multipath transmission control protocol MPTCP chain road;

The forwarding module 302 is configured to forward the secondary TCP request to the initial server indicated by the indication information when the third initial server is different from the initial server indicated by the indication information.

Optionally, as shown in FIG. 9, the data transmission device 300 further includes: a forwarding secondary request module 303, configured to forward the secondary TCP request to the first target when the third initial server is the same as the initial server indicated by the indication information server, the first target server is a target server located on the main TCP link among the multiple target servers.

Optionally, please continue to refer to FIG. 9 , the data transmission device 300 further includes: a receiving main request module 304 and a forwarding main request module 305 .

The receiving primary request module 304 is used to receive the primary TCP request for establishing the primary TCP link sent by the client before receiving the secondary TCP request for establishing the secondary TCP link sent by other devices, and the initial server indicated by the indication information is the third initial server;

A forwarding main request module 305, configured to forward the main TCP request to the first target server.

Optionally, the indication information includes an identifier of the third initial server, and multiple target servers are configured with correspondences between identifiers and addresses of multiple initial servers. The forwarding main request module 305 is further configured to process the main TCP request, so that the processed main TCP request carries the address of the third initial server; and send the processed main TCP request to the first target server.

Optionally, the indication information carries an identifier of the indicated initial server, and multiple initial servers are configured with correspondences between identifiers and addresses of multiple initial servers. The forwarding module 302 is further configured to acquire the identifier of the initial server carried in the indication information; based on the acquired identifier of the initial server and the corresponding relationship between identifiers and addresses of multiple initial servers, determine the address of the initial server indicated by the indication information; Based on the address of the initial server indicated by the indication information, the secondary TCP request is sent to the initial server indicated by the indication information.

Optionally, the primary TCP request carries an MPTCP key, and the secondary TCP request carries token information for indicating the key. As shown in FIG. 9 , the data transmission device 300 further includes: an establishment module 306 and a search module 307 .

Establishing module 306, used for establishing the corresponding relationship between the key and the first target server before the third initial server forwards the main TCP request to the first target server;

The search module 307 is configured to search for the first TCP request corresponding to the key indicated by the token information in the corresponding relationship between the key and the first target server before the third initial server forwards the secondary TCP request to the first target server. target server.

Optionally, the data transmission system further includes a transfer device. The main request receiving module 304 is also configured to receive the main TCP request sent by the client through the transfer device.

The receiving module 301 is further configured to, when the other device is a client, receive a secondary TCP request for establishing a secondary TCP link sent by the client through the transit device.

Optionally, the secondary TCP request includes an address identification field, and the address identification field carries the above indication information.

The present application provides a data transmission device, which is used for a first target server in a data transmission system. The data transmission system includes a client, multiple initial servers, and multiple target servers. The first target server is located among the multiple target servers. For the server on the main TCP link established by the client, as shown in FIG. 10 , the data transmission device 500 includes: a first sending module 501 , a receiving module 502 and a second sending module 503 .

The first sending module 501 is configured to send indication information of the first initial server to the client, where the first initial server is: an initial server located on the main TCP link among the multiple initial servers;

The receiving module 502 is configured to receive a secondary TCP request for establishing a secondary TCP link sent by the first initial server, and the secondary TCP link and the primary TCP link belong to the same multipath transmission control protocol MPTCP link;

The second sending module 503 is configured to send a response to the secondary TCP request to the client based on the secondary TCP request.

Optionally, as shown in FIG. 11 , the data transmission device 500 further includes: a receiving main request module 504, configured to receive the establishing main TCP chain forwarded by the first initial server before sending the indication information of the first initial server to the client. The main TCP request of the route.

The first sending module 501 is further configured to: the first target server sends a response to the main TCP request to the client, and the response to the main TCP request carries indication information.

Optionally, the indication information includes an identifier of the first initial server, and multiple target servers are configured with correspondences between identifiers and addresses of multiple initial servers. The data transmission device 500 also includes: an acquisition module 505 and a determination module 506 .

An acquisition module 505, configured to acquire the address of the first initial server carried in the main TCP request before sending the indication information of the first initial server to the client;

The determining module 506 is configured to determine the identifier of the first initial server based on the address of the first initial server and the correspondence between identifiers and addresses of multiple initial servers.

An embodiment of the present application provides a data transmission system, as shown in Figure 1 or 2, the data transmission system includes a client, multiple initial servers and multiple target servers,

The first target server is configured to send the indication information of the first initial server to the client, where both the first initial server and the first target server are located on the main transmission control protocol TCP link established by the client.

The client is used to send a secondary TCP request for establishing a secondary TCP link to the second initial server according to the instruction information, wherein the second initial server is any initial server among the multiple initial servers, and the secondary TCP link and the primary TCP link belong to the same multipath transmission control protocol MPTCP link, and the secondary TCP request carries indication information.

The second initial server is configured to forward the secondary TCP request to the first initial server when it is different from the first initial server indicated by the indication information.

The first initial server is used to forward the secondary TCP request to the first target server.

The first target server is configured to send a response to the secondary TCP request to the client based on receiving the secondary TCP request.

Optionally, the second initial server is configured to forward the secondary TCP request to the first target server when it is the same as the first initial server indicated by the indication information.

Optionally, the client is configured to send a primary TCP request for establishing a primary TCP link to the first initial server before the first target server sends the instruction information of the first initial server to the client.

The first initial server is used to forward the main TCP request to the first target server.

The first target server is configured to send a response to the main TCP request to the client, and the response to the main TCP request carries indication information.

Optionally, the indication information includes an identifier of the first initial server, and multiple target servers are configured with correspondences between identifiers and addresses of multiple initial servers.

The first initial server is configured to process the main TCP request, so that the processed main TCP request carries the address of the first initial server.

The first initial server is used to send the processed primary TCP request to the first target server.

Before the first target server is used to send the indication information of the first initial server to the client, the first target server is used to acquire the address of the first initial server carried in the main TCP request.

The first target server is configured to determine the identifier of the first initial server based on the address of the first initial server and the correspondence between identifiers and addresses of multiple initial servers.

Optionally, the indication information includes an identifier of the first initial server, and multiple initial servers are configured with correspondences between identifiers and addresses of multiple initial servers.

The second initial server is used to obtain the identifier of the first initial server carried in the secondary TCP request.

The second initial server is configured to determine the address of the first initial server based on the identifier of the first initial server and the correspondence between identifiers and addresses of multiple initial servers.

The second initial server is used to send the secondary TCP request to the first initial server based on the address of the first initial server.

Optionally, the address of the origin server 130 includes an Internet Protocol IP address.

Optionally, the secondary TCP request includes an address identification field, and the address identification field carries indication information of the first initial server.

Optionally, the primary TCP request carries an MPTCP key, and the secondary TCP request carries token information for indicating the key.

The first initial server is used to establish a corresponding relationship between the key and the first target server before the first initial server forwards the main TCP request to the first target server.

Before the first initial server forwards the secondary TCP request to the first target server, in the corresponding relationship between the key and the first target server, search for the first key corresponding to the key indicated by the token information. target server.

Optionally, the data transmission system further includes: a transfer device.

The client is configured to send a main TCP request to the first initial server through the transit device.

The client is configured to send a secondary TCP request to the second initial server through the transit device according to the indication information.

The embodiment of the present invention also provides a computer-readable storage medium, the computer-readable storage medium stores an instruction, and when the instruction is run on the computer, the computer executes the client in the data transmission method provided by the embodiment of the present invention. steps to execute. For example, step 101 and step 108 in the embodiment shown in FIG. 3 .

Alternatively, the computer is made to execute the steps executed by the first initial server in the data transmission method provided by the embodiment of the present invention. For example, steps 102 to 104 and step 110 in the embodiment shown in FIG. 3 .

Alternatively, the computer is made to execute the steps executed by the second initial server in the data transmission method provided by the embodiment of the present invention. For example, step 109 in the embodiment shown in FIG. 3 .

Alternatively, the computer is made to execute the steps executed by the first target server in the data transmission method provided by the embodiment of the present invention. For example, steps 105 to 107 and step 111 in the embodiment shown in FIG. 3 .

The embodiment of the present invention also provides a computer program product containing instructions, and when the computer program product runs on a computer, it causes the computer to execute the steps performed by the client in the above method embodiments. For example, step 101 and step 108 .

Alternatively, the computer is made to execute the steps executed by the first initial server in the data transmission method provided by the embodiment of the present invention. For example, steps 102 to 104 and step 110 in the embodiment shown in FIG. 3 .

Alternatively, the computer is made to execute the steps executed by the second initial server in the data transmission method provided by the embodiment of the present invention. For example, step 109 in the embodiment shown in FIG. 3 .

Alternatively, the computer is made to execute the steps executed by the first target server in the data transmission method provided by the embodiment of the present invention. For example, steps 105 to 107 and step 111 in the embodiment shown in FIG. 3 .

An embodiment of the present application provides a chip, and the chip includes a programmable logic circuit and/or program instructions, which are used to implement the steps executed by the client in the above method embodiments when the chip is running. For example, step 101 and step 108 .

Alternatively, the computer is made to execute the steps executed by the first initial server in the data transmission method provided by the embodiment of the present invention. For example, steps 102 to 104 and step 110 in the embodiment shown in FIG. 3 .

Alternatively, the computer is made to execute the steps executed by the second initial server in the data transmission method provided by the embodiment of the present invention. For example, step 109 in the embodiment shown in FIG. 3 .

Alternatively, the computer is made to execute the steps executed by the first target server in the data transmission method provided by the embodiment of the present invention. For example, steps 105 to 107 and step 111 in the embodiment shown in FIG. 3 .

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above embodiments can be completed by hardware, and can also be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium. The above-mentioned The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, and the like.

In the present application, the terms "first" and "second" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

Those of ordinary skill in the art can realize that, in combination with the various method steps and units described in the embodiments disclosed herein, they can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the possibility of hardware and software For interchangeability, in the above description, the steps and components of each embodiment have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those of ordinary skill in the art may implement the described functionality using different methods for each particular application, but such implementation should not be considered as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and module can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed server, device and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the mutual coupling or direct coupling or network connection shown or discussed may be indirect coupling or network connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

In addition, each functional module in each embodiment of the present application may be integrated into one processing module, each module may exist separately physically, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules.

If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of software products, and the computer software products are stored in a storage medium In, several instructions are included to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other various media that can store program codes. .

The above is only a specific embodiment of the application, but the scope of protection of the application is not limited thereto. Any person familiar with the technical field can easily think of various equivalents within the scope of the technology disclosed in the application. Modifications or replacements, these modifications or replacements shall be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (25)

1. a kind of data transmission method, which is characterized in that be applied to data transmission system, the data transmission system includes client End, multiple initial servers and multiple destination servers, which comprises

First object server sends the instruction information of the first initial server to the client, wherein described first is initial Server and the first object server are respectively positioned on the main transmission control protocol TCP chain road that the client is established, described First initial server is any initial server in the multiple initial server；

The client sends the secondary TCP request for establishing time TCP link according to the instruction information to the second initial server, In, second initial server is any initial server in the multiple initial server, the secondary TCP link and master TCP link belongs to same multi-path transmission control protocol MPTCP link, carries the instruction information in the secondary TCP request；

Second initial server, will be described when with the first initial server difference indicated by the instruction information Secondary TCP request is forwarded to first initial server；

The secondary TCP request is forwarded to the first object server by first initial server；

The first object server sends the secondary TCP request based on the secondary TCP request received, Xiang Suoshu client Response.

2. the method according to claim 1, wherein the method also includes:

Second initial server, will be described when identical as first initial server indicated by the instruction information Secondary TCP request is forwarded to the first object server.

3. method according to claim 1 or 2, which is characterized in that in the first object server to the client Before sending the instruction information of the first initial server, the method also includes:

The client sends the main TCP request for establishing the main TCP link to first initial server；

The main TCP request is forwarded to the first object server by first initial server；

The first object server sends the instruction information of the first initial server to the client, comprising:

The first object server sends the response that the main TCP is requested, the response of the main TCP request to the client Carry the instruction information.

4. according to the method described in claim 3, it is characterized in that, the instruction information includes first initial server Mark, the multiple destination server are each equipped with the mark of the multiple initial server and the corresponding relationship of address；

The main TCP request is forwarded to the first object server by first initial server, comprising:

First initial server handles the main TCP request, so that treated, the main TCP request is carried The address of first initial server；

First initial server is to the first object server main TCP request that sends that treated；

Before the first object server sends the instruction information of the first initial server to the client, the method Further include:

The first object server obtains the address for first initial server that the main TCP request carries；

The mark of address and the multiple initial server of the first object server based on first initial server Know the corresponding relationship with address, determines the mark of first initial server.

5. the method according to claim 3 or 4, which is characterized in that the instruction information includes first initial service The mark of device, the multiple initial server are each equipped with the mark of the multiple initial server and the corresponding relationship of address；

Second initial server, will be described when with the first initial server difference indicated by the instruction information Secondary TCP request is forwarded to first initial server, comprising:

Second initial server obtains the mark for first initial server that the secondary TCP request carries；

The mark of mark and the multiple initial server of second initial server based on first initial server Know the corresponding relationship with address, determines the address of first initial server；

The secondary TCP request is sent to described by address of second initial server based on first initial server First initial server.

6. method according to claim 4 or 5, which is characterized in that the address of the initial server includes internet protocol Discuss IP address.

7. according to any method of claim 3 to 6, which is characterized in that the main TCP request carries the MPTCP Key, the secondary TCP request carries the token information for being used to indicate the key, the method also includes:

Before the main TCP request is forwarded to the first object server by first initial server, described first Initial server establishes the corresponding relationship of the key and the first object server；

Before the secondary TCP request is forwarded to the first object server by first initial server, described first Initial server is searched indicated by the token information in the corresponding relationship of the key and the first object server The first object server corresponding to the key.

8. according to any method of claim 3 to 7, which is characterized in that the data transmission system further includes that transfer is set It is standby；

The client sends main TCP request to first initial server, comprising: the client is set by the transfer It is standby to send the main TCP request to first initial server；

The client sends time TCP request to the second initial server according to the instruction information, comprising: the client root According to the instruction information by the relay device, time TCP request is sent to the second initial server.

9. method according to any one of claims 1 to 8, which is characterized in that the secondary TCP request includes that address label is become literate Section, the address identification field carry the instruction information of first initial server.

10. a kind of data transmission method, which is characterized in that for the client in data transmission system, the data transmission system System further include: multiple initial servers and multiple destination servers, which comprises

Client receives at the beginning of first in multiple initial servers that first object server is sent in the multiple destination server The instruction information of beginning server, wherein the first object server and first initial server are respectively positioned on the client Hold the main transmission control protocol TCP chain road established；

The client sends the secondary TCP request for establishing time TCP link according to the instruction information to the second initial server, In, second initial server is any initial server in the multiple initial server, the secondary TCP link and master TCP link belongs to same multi-path transmission control protocol MPTCP link, carries the instruction information in the secondary TCP request；

The client receives the response for the secondary TCP request that the first object server is sent.

11. a kind of data transmission method, which is characterized in that for the third initial server in data transmission system, the number It include client, multiple initial servers and multiple destination servers according to Transmission system, the third initial server is described Any initial server in multiple initial servers, which comprises

Secondary TCP that the third initial server receives the foundation time TCP link that other equipment are sent is requested, wherein it is described its His equipment includes: any service in the client or the multiple initial server in addition to the third initial server Device carries instruction information in the secondary TCP request, and the instruction information is used to indicate position in the multiple initial server Initial server in the main TCP chain road that the client is established, the secondary TCP link and the main TCP link belong to together One multi-path transmission control protocol MPTCP link；

The third initial server asks the secondary TCP when with initial server difference indicated by the instruction information It asks and is forwarded to initial server indicated by the instruction information.

12. a kind of data transmission method, which is characterized in that for the first object server in data transmission system, the number It include client, multiple initial servers and multiple destination servers according to Transmission system, the first object server is described It is located at the server for the main TCP chain road that the client is established in multiple destination servers, which comprises

The first object server sends the instruction information of the first initial server to the client, wherein described first Initial server are as follows: be located at the initial server of the main TCP chain road in multiple initial servers；

The first object server receives the secondary TCP request for the foundation time TCP link that first initial server is sent, institute It states time TCP link and main TCP link belongs to same multi-path transmission control protocol MPTCP link；

The first object server is based on the secondary TCP request, and Xiang Suoshu client sends the response of the secondary TCP request.

13. a kind of data transmission system, which is characterized in that the data transmission system includes client, multiple initial servers With multiple destination servers,

First object server is used to send the instruction information of the first initial server to the client, wherein described first Initial server and the first object server are respectively positioned on the main transmission control protocol TCP chain road that the client is established, First initial server is any initial server in the multiple initial server；

The client is used to send the secondary TCP for establishing secondary TCP link to the second initial server according to the instruction information and asks It asks, wherein second initial server is any initial server in the multiple initial server, the secondary TCP chain Lu Yuzhu TCP link belongs to same multi-path transmission control protocol MPTCP link, carries the finger in the secondary TCP request Show information；

Second initial server is used for described first indicated by second initial server and the instruction information When initial server difference, the secondary TCP request is forwarded to first initial server；

First initial server is used to the secondary TCP request being forwarded to the first object server；

The first object server is used for based on the secondary TCP request is received, and Xiang Suoshu client sends the secondary TCP and asks The response asked.

14. system according to claim 13, which is characterized in that second initial server be used for the instruction When first initial server indicated by information is identical, the secondary TCP request is forwarded to the first object server.

15. system described in 3 or 14 according to claim 1, which is characterized in that the client is used to take in the first object Before business device sends the instruction information of the first initial server to the client, the first initial server of Xiang Suoshu, which is sent, to be established The main TCP of the main TCP link is requested；

First initial server is used to the main TCP request being forwarded to the first object server；

The first object server is used to send the response that the main TCP is requested to the client, the main TCP request Response carries the instruction information.

16. system according to claim 15, which is characterized in that the instruction information includes first initial server Mark, the multiple destination server is each equipped with the mark of the multiple initial server and the corresponding relationship of address；

First initial server is used to handle the main TCP request, so that treated, the main TCP request is taken Address with first initial server；

First initial server is used to send treated the main TCP request to the first object server；

The first object server is used to be used to send first to the client in the first object server and initially take It is engaged in front of the instruction information of device, obtains the address for first initial server that the main TCP request carries；

The first object server is used for address and the multiple initial server based on first initial server Mark and address corresponding relationship, determine the mark of first initial server.

17. system according to claim 15 or 16, which is characterized in that the instruction information includes the described first initial clothes The mark of business device, the multiple initial server is each equipped with the mark of the multiple initial server and the corresponding of address is closed System；

Second initial server is used to obtain the mark for first initial server that the secondary TCP request carries；

Second initial server is used for mark and the multiple initial server based on first initial server Mark and address corresponding relationship, determine the address of first initial server；

Second initial server is used for the address based on first initial server, and the secondary TCP request is sent to First initial server.

18. system according to claim 16 or 17, which is characterized in that the address of the initial server includes internet Protocol IP address.

19. 3 to 18 any system according to claim 1, which is characterized in that the secondary TCP request includes that address label is known Field, the address identification field carry the instruction information of first initial server.

20. 5 to 19 any system according to claim 1, which is characterized in that the main TCP request carries described The key of MPTCP, the secondary TCP request carry the token information for being used to indicate the key,

First initial server is used to that the main TCP request to be forwarded to first mesh in first initial server Before marking server, the corresponding relationship of the key and the first object server is established；

First initial server is used to that the secondary TCP request to be forwarded to first mesh in first initial server Before marking server, in the corresponding relationship of the key and the first object server, it is signified to search the token information The first object server corresponding to the key shown.

21. 5 to 20 any system according to claim 1, which is characterized in that the data transmission system further includes transfer Equipment；

The client is used to send the main TCP to first initial server by the relay device and request；

The client is used to according to the instruction information send time TCP to the second initial server by the relay device Request.

22. a kind of data transmission device, which is characterized in that for the client in data transmission system, the data transmission system System further include: multiple initial servers and multiple destination servers, described device include:

First receiving module, for receiving multiple initial services that first object server is sent in the multiple destination server The instruction information of first initial server in device, wherein the first object server and the equal position of the first initial server In the main transmission control protocol TCP chain road that the client is established；

Sending module, for being asked according to the instruction information to the secondary TCP that the second initial server sends foundation time TCP link It asks, wherein second initial server is any initial server in the multiple initial server, the secondary TCP chain Lu Yuzhu TCP link belongs to same multi-path transmission control protocol MPTCP link, carries the finger in the secondary TCP request Show information；

Second receiving module, for receiving the response for the secondary TCP request that the first object server is sent.

23. a kind of data transmission device, which is characterized in that for the third initial server in data transmission system, the number It include client, multiple initial servers and multiple destination servers according to Transmission system, the third initial server is described Any initial server in multiple initial servers, described device include:

Receiving module, the secondary TCP request of the foundation time TCP link for receiving other equipment transmission, wherein the other equipment It include: any server in the client or the multiple initial server in addition to the third initial server, institute It states and carries instruction information in time TCP request, and the instruction information is used to indicate in the multiple initial server and is located at institute The initial server of the main TCP chain road of client foundation is stated, the secondary TCP link and the main TCP link belong to same more Path transmission control protocol MPTCP link；

Forwarding module, when for the initial server difference indicated by the third initial server and the instruction information, The secondary TCP request is forwarded to initial server indicated by the instruction information.

24. a kind of data transmission device, which is characterized in that for the first object server in data transmission system, the number It include client, multiple initial servers and multiple destination servers according to Transmission system, the first object server is described It is located at the server for the main TCP chain road that the client is established in multiple destination servers, described device includes:

First sending module, for sending the instruction information of the first initial server to the client, wherein at the beginning of described first Beginning server are as follows: be located at the initial server of the main TCP chain road in multiple initial servers；

Receiving module, it is described secondary for receiving the secondary TCP request for the foundation time TCP link that first initial server is sent TCP link and main TCP link belong to same multi-path transmission control protocol MPTCP link；

Second sending module, for based on the secondary TCP request, Xiang Suoshu client to send the response of the secondary TCP request.

25. a kind of computer readable storage medium, which is characterized in that instruction is stored in the computer readable storage medium, When described instruction is run on computers, so that the computer executes the data as described in claim 10 to 12 is any and passes Transmission method.