CN107231445A - A kind of dynamic domain name system DNS reorientation methods, apparatus and system - Google Patents

Abstract

The present invention provides a DNS redirection method, device and system of a dynamic domain name system, comprising: forwarding a domain name resolution request message received from a client to a dynamic domain name system DNS server; receiving the DNS server according to the domain name resolution request The response message returned by the message, wherein the response message carries the address information allocated by the DNS for the client to access the network; according to the address information, the corresponding Acquiring redirection address information in the relationship; sending the redirection address information to the client. Through the present invention, it is possible to avoid operating the DNS server database during the DNS redirection process, which solves the technical problem that the DNS database needs to be reconfigured for redirection when the DNS server fails, and also reduces the load on the server; improves network recovery speed and customer satisfaction.

Description

A dynamic domain name system DNS redirection method, device and system

technical field

The invention relates to the fields of communication and computer, in particular to a dynamic domain name system DNS redirection method, device and system.

Background technique

The domain name system (Domain Name System, referred to as DNS) domain name resolution can map domain names to Internet Protocol (Internet Protocol, referred to as IP) addresses or IP addresses to domain names, which is convenient for users to directly use host names to access the Internet. When an error occurs in the DNS resolution, the user cannot access the website normally. At this time, it is necessary to use redirection technology to the DNS server to restore its normal resolution function. Existing DNS redirection technology mainly contains two kinds, one is to use DNS server to redirect, the second is to use load balancing (Global Server Load Balance, referred to as GSLB) equipment to complete, these two methods all need to re-direct Adjust the DNS server database. Due to the complex operation of the database, it takes a long time to restore the DNS server failure, which seriously affects the user's online experience.

In the related art, when the DNS server fails, the DNS database needs to be reconfigured for redirection, and the business cannot be performed quickly. No effective solution has been proposed yet.

Contents of the invention

The present invention provides a DNS redirection method, device and system of a dynamic domain name system to at least solve the problem in the related art that when the DNS server fails, the redirection needs to reconfigure the DNS database and the business cannot be quickly restored.

According to one aspect of the present invention, a dynamic domain name system DNS redirection method is provided, including: forwarding the domain name resolution request message received from the client to the dynamic domain name system DNS server; receiving the DNS server according to the domain name resolution request A response message returned by the message, wherein the response message carries the address information allocated by the DNS for the client to access the network; according to the address information, the corresponding Acquiring redirection address information in the relationship; sending the redirection address information to the client. The corresponding relationship table between the alleged original IP address information and the redirected IP address information is stored on the gateway.

Further, before forwarding the domain name resolution request message received from the client to the DNS server of the dynamic domain name system, the method further includes: receiving a DNS redirection configuration command sent by the service management platform; configuring the DNS redirection configuration command according to the DNS redirection configuration command Correspondence between address information and redirection address information.

Further, configuring the corresponding relationship between address information and redirection address information according to the DNS redirection configuration command includes: in the case that the DNS redirection configuration command does not carry a configuration file, according to the DNS redirection configuration command to The service management platform requests and obtains a configuration file, and establishes a correspondence between address information and redirection address information according to the configuration file; or, in the case that the DNS redirection configuration command carries a configuration file, according to the configured The corresponding relationship between configuration address information and redirection address information in the above configuration file.

Further, forwarding the domain name resolution request message received from the client to the dynamic domain name system DNS server includes: recording the IP address and port number in the domain name resolution request message; The source MAC address and the source IP address information in the IP header are replaced with the MAC address and IP address of the outgoing interface; and the modified domain name resolution request message is forwarded to the DNS server.

Further, the redirection address information carries the IP address and port number of the client.

According to another aspect of the present invention, a dynamic domain name system DNS redirection device is provided, which is applied to a gateway, including: a forwarding module, configured to forward a domain name resolution request message received from a client to a dynamic domain name system DNS server; A receiving module, configured to receive a response message returned by the DNS server according to the domain name resolution request message, wherein the response message carries address information allocated by the DNS for the client to access the network; an acquisition module The method is configured to obtain redirection address information from a pre-configured correspondence between address information and redirection address information according to the address information; a sending module is configured to send the redirection address information to the client.

Further, the device further includes: a second receiving module, configured to receive a DNS redirection configuration command sent by the service management platform; a configuration module, configured to configure address information and redirection address information according to the DNS redirection configuration command Correspondence.

Further, the configuration module includes: a first configuration unit, configured to request and obtain from the service management platform according to the DNS redirection configuration command when no configuration file is carried in the DNS redirection configuration command. configuration file, and establish the corresponding relationship between address information and redirection address information according to the configuration file; or, the second configuration unit is configured to, in the case where the configuration file is carried in the DNS redirection configuration command, according to the The configuration file configures the corresponding relationship between address information and redirection address information.

Further, the forwarding module includes: a recording unit, configured to record the IP address and port number in the domain name resolution request message; a replacement unit, configured to replace the source MAC address in the Ethernet header in the domain name resolution request message The address and the source IP address information in the IP header are replaced with the MAC address and IP address of the device; a forwarding unit, configured to forward the modified domain name resolution request message to the DNS server.

According to another aspect of the present invention, a dynamic domain name system DNS redirection system is also provided, including a gateway and a DNS server, wherein: the DNS server is used to receive the domain name resolution request message received from the client forwarded by the gateway, and according to the The response message returned by the domain name resolution request message, wherein the response message carries the address information assigned by the DNS to the client for accessing the network; the gateway is configured to receive the response message, and according to the address The information obtains the redirection address information from the pre-configured correspondence between the address information and the redirection address information, and sends the redirection address information to the client.

Further, the system further includes: a service management platform, configured to send a DNS redirection configuration command to the gateway, wherein the DNS redirection configuration command is used for the gateway to configure a correspondence between address information and redirection address information.

Through the present invention, it is possible to avoid operating the DNS server database during the DNS redirection process, and the address replacement part in the traditional redirection process is completed on the gateway, which solves the problem that the DNS database needs to be reconfigured when the DNS server fails. Technical problems also reduce the load on the server; significantly improve the network recovery speed and improve user satisfaction.

Description of drawings

Fig. 1 is the flow chart of a kind of dynamic domain name system DNS redirection method of the embodiment of the present invention;

Fig. 2 is a structural block diagram of a dynamic domain name system DNS redirection device according to an embodiment of the present invention;

Fig. 3 is a preferred structural block diagram 1 of a dynamic domain name system DNS redirection device according to an embodiment of the present invention;

Fig. 4 is a structural block diagram of a configuration module in a dynamic domain name system DNS redirection device according to an embodiment of the present invention;

FIG. 5 is a structural block diagram of a forwarding module in a dynamic domain name system DNS redirection device according to an embodiment of the present invention;

FIG. 6 is an optimal flowchart of a dynamic domain name system DNS redirection system according to an embodiment of the present invention;

Fig. 7 is a flowchart of optimal configuration commands of a dynamic domain name system DNS redirection system according to an embodiment of the present invention;

Fig. 8 is a flow chart of obtaining configuration commands of a dynamic domain name system DNS redirection system according to an embodiment of the present invention;

Fig. 9 is a redirection flowchart of a dynamic domain name system DNS redirection system according to an embodiment of the present invention.

detailed description

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

An embodiment of the present invention provides a dynamic domain name system DNS redirection method, which is used in a system with a home gateway implementing the redirection method, and a dynamic domain name system DNS redirection method. FIG. 1 is drawn according to an embodiment of the present invention A flow chart of a dynamic domain name system DNS redirection method, as shown in Figure 1, the process includes the following steps:

Step S102: forwarding the domain name resolution request message received from the client to the DNS server of the dynamic domain name system;

Step S104: receiving a response message returned by the DNS server according to the domain name resolution request message, wherein the response message carries address information assigned by the DNS to the client for accessing the network;

Step S106: Obtain redirection address information from the pre-configured correspondence between address information and redirection address information according to the address information; and send the redirection address information to the client.

Through the above steps, the home gateway forwards the domain name resolution request message to the DNS server, and the DNS server does not process the message, and directly returns the DNS response information carrying the wrong address information, and the home gateway sends the wrong address information in the response information Replace with the correct address information, and then the home gateway forwards the replaced response information to the client, and the client uses the address information in the replaced response information to access the Internet, thus providing a fast reply method for DNS services, which significantly improves User experience, reducing the difficulty of DNS server management.

Preferably, before the DNS redirection device forwards the domain name resolution request message received from the client to the DNS server of the dynamic domain name system, it receives the DNS redirection configuration command sent by the service management platform; according to the DNS redirection configuration command in the home gateway Configure the corresponding relationship between the address information and the redirection address information, which is used for the home gateway to search in step S106.

Preferably, the DNS redirection device uses two methods to configure the corresponding relationship between the address information and the redirection address information according to the DNS redirection configuration command. In one of the scenarios, the DNS redirection configuration command does not carry the configuration file, and the DNS redirection After receiving the configuration command, the device immediately requests and obtains the configuration file from the service management platform, and establishes the corresponding relationship between the address information and the redirection address information according to the configuration file; in another scenario, the DNS redirection configuration command The configuration file is carried, and the DNS redirection device then configures the corresponding relationship between the address information and the redirection address information according to the configuration file carried in the configuration command.

Preferably, before the DNS redirection device executes the S102 step, before the domain name resolution request message received from the client is forwarded to the dynamic domain name system DNS server, it records the IP address and port number in the client domain name resolution request message; The source MAC address in the Ethernet header in the domain name resolution request message and the source IP address information in the IP header are replaced with the MAC address and IP address of the outgoing interface; the modified domain name resolution request message is forwarded to the DNS server . Through this step, the DNS redirection device disguises itself as a client and sends DNS request information to the DNS server.

Preferably, the DNS redirection device performs step S106, that is, when sending a message of redirection address information to the client, the previously recorded IP address and port number of the client are added to the message, and through this step, the DNS redirection device will Pretending to be a DNS server, so that the client receives redirection messages without awareness.

In the DNS redirection method of a dynamic domain name system provided by the present invention, the corresponding relationship between the DNS original address information and the redirection address information carried in the configuration file or configuration command managed by the service management platform should be unique, that is, one original address information It can only correspond to one redirection address information, which is guaranteed by the service management platform and can be verified by the gateway device. If it is found to be not unique, the service management platform will be notified of the failure to deliver the configuration.

The embodiment of the present invention also provides a dynamic domain name system DNS redirection device, which is applied to a gateway. FIG. 2 is a structural block diagram of a dynamic domain name system DNS redirection device according to an embodiment of the present invention. As shown in FIG. 2 , the device includes The following parts:

The forwarding module 22 is used to forward the domain name resolution request message received from the client to the dynamic domain name system DNS server;

The first receiving module 24 is configured to receive a response message returned by the DNS server according to the domain name resolution request message, wherein the response message carries address information assigned by the DNS to the client for accessing the network ;

An obtaining module 26, configured to obtain redirection address information from the pre-configured correspondence between address information and redirection address information according to the address information;

A sending module 28, configured to send the redirection address information to the client.

Fig. 3 is a preferred structural block diagram 1 of a dynamic domain name system DNS redirection device according to an embodiment of the present invention. As shown in Fig. 3, the device may also include:

The second receiving module 32 is configured to receive the DNS redirection configuration command sent by the service management platform;

The configuration module 34 is configured to configure a correspondence between address information and redirection address information according to the DNS redirection configuration command. The device can use this module to accept the configuration of the service management platform.

Fig. 4 is a preferred structural block diagram 1 of configuration module in a kind of dynamic domain name system DNS redirection device of the embodiment of the present invention, as shown in Fig. 4, configuration module 34 comprises:

The configuration unit 42 is configured to request and obtain a configuration file from the service management platform according to the DNS redirection configuration command when the configuration file is not carried in the DNS redirection configuration command, and establish a configuration file according to the configuration file. The correspondence between address information and redirection address information; or, in the case that the DNS redirection configuration command carries a configuration file, configure the correspondence between address information and redirection address information according to the configuration file.

Fig. 5 structural block diagram of forwarding module in a kind of dynamic domain name system DNS redirection device of the embodiment of the present invention, as shown in Fig. 5, the forwarding module 22 in this device comprises:

A recording unit 52, configured to record the IP address and port number in the domain name resolution request message;

A replacement unit 54, configured to replace the source MAC address in the Ethernet header and the source IP address information in the IP header in the domain name resolution request message with the MAC address and IP address of the device;

The forwarding unit 56 is configured to forward the modified domain name resolution request message to the DNS server.

Through the above-mentioned structure, the forwarding module disguises itself as a client when forwarding a request, so that the DNS server can send a DNS response request unconsciously.

The embodiment of the present invention also provides a dynamic domain name system DNS redirection system, which includes a gateway and a DNS server, wherein: the DNS server is used to receive the domain name resolution request message received from the client and forwarded by the gateway, and according to the domain name resolution A response message returned by the request message, wherein the response message returned from the DNS server carries the address information allocated by the DNS for the client to access the network; the gateway is used to receive the response message, and according to the address The information obtains the redirection address information from the pre-configured correspondence between the address information and the redirection address information, and sends the redirection address information to the client.

Fig. 6 is a preferred flow chart of a dynamic domain name system DNS redirection in the embodiment of the present invention , as shown in Fig. 6, comprising the following steps:

Step S602, the terminal sends a DNS request message to the gateway;

Step S604, the gateway forwards the DNS request message of the client to the DNS server;

Step S606, the DNS server sends a DNS response message to the gateway;

Step S608, the gateway parses the address message in the response message, and replaces the address in the DNS server with the redirection address according to the corresponding table in its own database;

Step S610, the gateway sends the replaced DNS response message to the client.

Preferably, the system further includes: a service management platform, configured to send a DNS redirection configuration command to the gateway, wherein the DNS redirection configuration command is used for gateway configuration address information and redirection address information correspondence.

FIG. 7 is a flowchart of an optimal configuration command of a dynamic domain name system DNS redirection system according to an embodiment of the present invention. As shown in Figure 7, including:

Step S702, the service platform sends a configuration command to the gateway;

Step S704, the gateway configures the corresponding relationship between the original address and the new address according to the configuration command.

Taking a dynamic domain name system redirection system as an example below, the embodiments of the present invention will be further described in combination with specific embodiments. Fig. 8 is a kind of dynamic domain name system DNS redirection system acquisition configuration order flow chart,

Step S802: the service management platform first sends a configuration command to the gateway, and the command information includes the URL of the server where the configuration file is located;

Step S804: the gateway initiates an http or ftp request, and obtains the configuration file by itself at a designated location;

Step S806: The gateway establishes a correspondence table between the original IP address and the redirected IP address according to the configuration file information and stores it on the gateway.

Fig. 9 is a redirection flow chart of a dynamic domain name system DNS redirection system provided according to an embodiment of the present invention. The embodiment of the present invention is further described by taking a dynamic domain name system redirection system as an example in combination with specific embodiments. As shown in Figure 9:

Step S902: the service platform first sends a redirection configuration command to the home gateway, and the command carries the address information of the configuration file;

Step S904: After the gateway parses the command, it sends an http or ftp request to the resource site where the configuration file is located;

Step S906: The configuration server sends the configuration file in xml format. The format of each corresponding relationship in the file is as follows: <ErrRedirectmode="1" SIP="aaa.aaa.aaa.aaa" DIP="bbb.bbb.bbb.bbb "/>, where "aaa.aaa.aaa.aaa" and "bbb.bbb.bbb.bbb" represent any legal IP address. The gateway parses the configuration file, and internally establishes a correspondence table between the original IP address and the redirected IP address.

Step S908: the gateway checks whether the corresponding relationship in the file is unique, that is, one original IP address only corresponds to one redirected IP address. If the uniqueness is satisfied, the gateway will establish the corresponding relationship between the original IP address and the redirected IP address. If the uniqueness is not satisfied, the configuration file is discarded, and the business platform is notified that the redirection setting fails. ;

Step S910: the gateway listens to the DNS request from the user side, and when intercepting the DNS request sent by the user equipment, records the IP address and port number of the request message on the user side as the unique identifier of the client program on the user side; the gateway will report In this article, the source MAC address in the Ethernet header and the source IP address information in the IP header are replaced with the MAC address and IP address of the outgoing interface of the gateway. Forward the modified message to the DNS server;

Step S912: the DNS server returns a DNS response message;

Step S914: the gateway receives a reply from the DNS server. Parses the addr field of the DNS response message to extract the IP address. If the IP address matches in the original IP column of the relationship table, or the IP address is empty, replace the information and reorganize the message; the gateway forwards the reorganized message to the user-side process according to the recorded user-side client program identification. ;

During the appeal process, the gateway analyzes the DNS response message and extracts the resolved IP address. If the response code (Responsecode) in the DNS response message is a name error (Name Error), or the number of answer records (ANCOUNT) is 0, then use "" (empty address) as the keyword in the original IP address in the redirection configuration data Find in the list. If the IP address exists in the original address information in the correspondence table, the addr information in the response message is modified to be the corresponding redirected IP address. If there is no such address, the DNS message part of the original message will not be modified.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. A method for redirecting a DNS of a dynamic domain name system is characterized by comprising the following steps:

forwarding a domain name resolution request message received from a client to a dynamic Domain Name System (DNS) server;

receiving a response message returned by the DNS according to the domain name resolution request message, wherein the response message carries address information which is distributed by the DNS to the client and used for accessing the network;

acquiring redirection address information from a preset corresponding relation between the address information and the redirection address information according to the address information;

and sending the redirection address information to the client.

2. The method of claim 1, wherein prior to forwarding the domain name resolution request message received from the client to the dynamic Domain Name System (DNS) server, the method further comprises:

receiving a DNS redirection configuration command sent by a service management platform;

and configuring the corresponding relation between the address information and the redirection address information according to the DNS redirection configuration command.

3. The method of claim 2, wherein configuring the correspondence between the address information and the redirection address information according to the DNS redirection configuration command comprises:

under the condition that the DNS redirection configuration command does not carry a configuration file, requesting and acquiring the configuration file from the service management platform according to the DNS redirection configuration command, and establishing a corresponding relation between address information and redirection address information according to the configuration file; or,

and under the condition that the DNS redirection configuration command carries a configuration file, configuring the corresponding relation between the address information and the redirection address information according to the configuration file.

4. The method according to any of claims 1 to 3, wherein forwarding the domain name resolution request message received from the client to the dynamic domain name system DNS server comprises:

recording an IP address and a port number in the domain name resolution request message;

replacing the source MAC address in the Ethernet header and the source IP address information in the IP header in the domain name resolution request message with the MAC address and the IP address of an output interface;

and forwarding the modified domain name resolution request message to the DNS.

5. The method of claim 4, wherein the redirection address information carries an IP address and a port number of the client.

6. A dynamic domain name system DNS redirection device is applied to a gateway and is characterized by comprising:

the forwarding module is used for forwarding the domain name resolution request message received from the client to a dynamic Domain Name System (DNS) server;

a first receiving module, configured to receive a response message returned by the DNS server according to the domain name resolution request message, where the response message carries address information that is allocated by the DNS for the client to access the network;

the acquisition module is used for acquiring the redirection address information from the corresponding relation between the address information and the pre-configured redirection address information according to the address information;

and the sending module is used for sending the redirection address information to the client.

7. The apparatus of claim 6, further comprising:

the second receiving module is used for receiving a DNS redirection configuration command sent by the service management platform;

and the configuration module is used for configuring the corresponding relation between the address information and the redirection address information according to the DNS redirection configuration command.

8. The apparatus of claim 7, wherein the configuration module comprises:

the first configuration unit is used for requesting and acquiring a configuration file from the service management platform according to the DNS redirection configuration command under the condition that the DNS redirection configuration command does not carry the configuration file, and establishing a corresponding relation between address information and redirection address information according to the configuration file; or,

and the second configuration unit is used for configuring the corresponding relation between the address information and the redirection address information according to the configuration file under the condition that the DNS redirection configuration command carries the configuration file.

9. The apparatus according to any one of claims 6 to 8, wherein the forwarding module comprises:

a recording unit, configured to record an IP address and a port number in the domain name resolution request message;

a replacing unit, configured to replace a source MAC address in an ethernet header and source IP address information in an IP header in the domain name resolution request message with a MAC address and an IP address of the device;

and the forwarding unit is used for forwarding the modified domain name resolution request message to the DNS server.

10. A dynamic Domain Name System (DNS) redirection system is characterized by comprising a gateway and a DNS server, wherein:

the DNS server is used for receiving a domain name resolution request message which is forwarded by a gateway and received from a client and returning a response message according to the domain name resolution request message, wherein the response message carries address information which is distributed by the DNS to the client and used for accessing a network;

and the gateway is used for receiving the response message, acquiring the redirection address information from the corresponding relation between the address information and the pre-configured redirection address information according to the address information, and sending the redirection address information to the client.

11. The system of claim 10, further comprising:

and the service management platform is used for sending a DNS redirection configuration command to the gateway, wherein the DNS redirection configuration command is used for the corresponding relation between the gateway configuration address information and the redirection address information.