CN1870819A - Method of route optimization for implementing IPv6 communication buddy supporting mobile IPv6 - Google Patents

Abstract

The present invention relates to a method for implementing IPv6 communication partners to support mobile IPv6 route optimization, the core of which includes: when a mobile IPv6 node communicates with an IPv6 communication partner using a route optimization method, the present invention acts as an agent for the IPv6 communication based on the communication partner gateway The partner processes the interaction information between the mobile IPv6 node and the IPv6 communication partner. Through the present invention, not only high-efficiency mobile IPv6 communication can be realized, but also the extended processing work of "route optimization" by a large number of communication partners can be completed by a small number of gateway devices, so that a large number of terminal types do not need to provide special services for mobile IPv6 If it is supported, it can realize the communication between ordinary IPv6 communication partners and mobile IPv6 nodes under the routing optimization mode of mobile IPv6, thereby reducing the upgrade cost, reducing the complexity of implementing IPv6 communication partners, and facilitating the deployment of mobile IPv6 applications.

Description

Method for Realizing IPv6 Communication Partner Supporting Mobile IPv6 Routing Optimization

technical field

The invention relates to the field of communication, in particular to a method for realizing routing optimization of IPv6 communication partners supporting mobile IPv6.

Background technique

With the development of network technology and the emergence of a large number of mobile terminals, such as notebook computers, PDAs, mobile phones, vehicle-mounted equipment, etc., the upsurge of mobile computing has been set off. More and more users can use various terminals, Connect to the Internet at any location through a public mobile wireless network.

In order to meet the needs of mobile services, Mobile IP (Mobile IP) technology is introduced at the network level.

The basic principle of Mobile IP technology is to enable the mobile node to use the initial IP address for IP communication during the mobile process, so as to ensure that the upper-layer applications carried by the IP network layer remain uninterrupted and continuous during the movement.

With the expansion of network scale, IPv6 technology will gradually replace the current IPv4 technology with its advantages such as huge address space. IPv6-based Mobile IP, that is, Mobile IPv6 technology, is becoming an upstart in the field of Mobile IP with the help of IPv6's own technical advantages and improvements to Mobile IPv4 technology, and is being gradually and widely used.

The following describes the basic principles of Mobile IPv6 technology in conjunction with Figure 1:

① When the mobile node is connected to its home network, it will work in the same way as other fixed nodes.

② The mobile node detects whether it has roamed to a foreign network through the neighbor discovery mechanism of IPv6. The IPv6 foreign gateway will periodically send a router announcement message, which contains the prefix of the foreign network. After receiving the router announcement message of the foreign gateway, the mobile node checks that the prefix of the foreign network is different from the prefix of the home network, and it is considered to have roamed. to a foreign network.

③ If the mobile node finds that it has moved to a foreign network, it will obtain the care-of address on the foreign network through a stateful or stateless address auto-configuration process on the basis of the received router announcement information. At this time, the mobile node has both a home address and a care-of address.

④ The mobile node registers its own care-of address with the home agent through the "binding update" message.

⑤ The mobile node can also register and notify its communication partner of the care-of address through the "binding update" message. Before registration, the mobile node and the communication partner need to perform the Return Routability detection process first, that is, the mobile node first sends the Home Init Test message and the Care-of Init Test message to the communication partner, and the latter returns the Home Test message and the Care-of Init Test message after processing. of Test message to the mobile node.

⑥ If the communication partner of the mobile node does not know its care-of address, it will send the data message to the home network of the mobile node according to the home address of the mobile node, and then its home agent will intercept these data messages, and then according to the mobile node The current care-of address uses the tunnel mechanism to forward these data packets to the mobile node.

The message sent by the mobile node to the communication partner will also be sent to the home agent through the reverse tunnel first, and then handed over to the communication partner by the home agent.

Because in this mode, the data message between the communication partner and the mobile node must be transferred through the home agent, so it is called "triangular routing" mode.

⑦ If the communication partner knows the care-of address of the mobile node through "binding update", it will use the routing extension header of IPv6 to directly transmit the data message to the mobile node. Since the first destination address of the data message is the care-of address, and the second destination address is the home address, the data message will be directly sent to the mobile node in the foreign network without going through the home agent.

In the opposite direction, the source address of the data message sent by the mobile node to the communication partner is the care-of address, and the home address is stored in the destination extension header of the data message. In this way, the data message can also be sent directly to the communication partner without going through the reverse tunnel to the home agent.

This method corresponds to the "triangular routing" method of ⑥, and is called the "route optimization" method.

The core of the technical solution of the first prior art related to the present invention is to adopt the "triangular routing" method to realize the communication between the mobile IPv6 node and the IPv6 communication partner.

It can be seen from the technical solution of the prior art 1 that when the communication between the mobile IPv6 node and the IPv6 communication partner is realized by means of "triangular routing", all the communication data packets between the mobile node and the communication partner must pass through the home network Proxy forwarding makes the home agent easy to become a bottleneck, which also increases network traffic and reduces network efficiency.

The core of the technical solution of the second prior art related to the present invention is to adopt the "route optimization" mode to realize the communication between the mobile IPv6 node and the IPv6 communication partner.

It can be seen from the technical solution of the prior art 2 that when the "route optimization" mode is used to realize the communication between the mobile IPv6 node and the IPv6 communication partner, the data message can be directly sent to the mobile node in the foreign network according to the care-of address, It does not need to be transferred through the home agent, so the mobile IPv6 communication efficiency can be improved. However, communication partners must process mobile IPv6 messages such as "binding update" and participate in the Return Routability detection process. At the same time, they must also process special IPv6 extension headers. Common IPv6 nodes need to be extended and upgraded to support routing in "route optimization" mode. communication partner.

From the above analysis, it can be seen that Mobile IPv6 technology solves the problem of mobile communication between mobile IPv6 nodes and common IPv6 communication partners. Perceived communication with mobile IPv6 nodes, but this solution has efficiency problems; and "route optimization" mode, although it solves the problem of communication efficiency, it must be extended to ordinary IPv6 communication partners to support Mobile IPv6 technology, so it is required in the network Existing IPv6 devices of all kinds, especially host nodes, including a large number of IPv6 terminals, are extended and upgraded to support Mobile IPv6, which will result in high application costs, thus limiting the application of Mobile IPv6 "route optimization" mode to a certain extent. application.

Contents of the invention

In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method for implementing IPv6 communication partners to support mobile IPv6 routing optimization. By this method, not only high-efficiency mobile IPv6 communication can be realized, but also a large number of terminal types , for example, ordinary IPv6 communication partners do not need to provide special support for mobile IPv6, and can realize communication between ordinary IPv6 communication partners and mobile IPv6 nodes in the routing optimization mode of mobile IPv6, thereby reducing the upgrade cost and reducing the cost of IPv6 The complexity realized by the communication partner is easy to deploy for mobile IPv6 applications.

The purpose of the present invention is achieved through the following technical solutions:

A kind of method that realizes that IPv6 communication partner supports the routing optimization of mobile IPv6 provided by the present invention, comprises:

A. When a mobile IPv6 node communicates with an IPv6 communication partner in a route optimization manner, the communication partner-based proxy gateway acts as an agent for the IPv6 communication partner to process the interaction information between the mobile IPv6 node and the IPv6 communication partner.

Wherein, the communication partner proxy gateway includes:

Set the default gateway device in the communication link when the mobile IPv6 node exchanges information with the IPv6 communication partner, set the designated gateway device in the communication link when the mobile IPv6 node exchanges information with the IPv6 communication partner, and set it in the network The key gateway device at the entrance and exit of the network, or the designated gateway device set at the entrance and exit of the network.

Wherein, before said step A includes:

The communication partner proxy gateway determines that it can process the interaction information between the mobile IPv6 node and the IPv6 communication partner for the communication partner according to the IPv6 neighbor information in the link it maintains;

or,

The communication partner proxy gateway determines through the routing information that it can process the interaction information between the mobile IPv6 node and the IPv6 communication partner as a proxy for the communication partner;

or,

The communication partner proxy gateway determines through the configuration information thereon that it can process the interaction information between the mobile IPv6 node and the IPv6 communication partner for the communication partner proxy.

Wherein, before said step A includes:

The mobile IPv6 node is connected to its home network, and obtains its home address through information interaction with the home network;

as well as,

The mobile IPv6 node detects whether it has roamed to a foreign network through the IPv6 neighbor discovery mechanism. When it finds that it has moved to a foreign network, it obtains the care-of address of the foreign network through the address configuration process;

The obtained care-of address is registered on the home agent through a binding update message.

Wherein, when the mobile IPv6 node initiates a detection process to the IPv6 communication partner before the obtained care-of address is registered with the IPv6 communication partner, the step A specifically includes:

A1. The mobile IPv6 node sends a Home Test Init message to its home agent, and sends it to an IPv6 communication partner through the home agent; and,

Send Care-of Test Init message to IPv6 communication partner;

A2. The communication partner proxy gateway intercepts the message sent to the IPv6 communication partner, and processes the intercepted message on behalf of the IPv6 communication partner.

Wherein, in step A2, the process of processing the intercepted message on behalf of the IPv6 communication partner specifically includes:

A21. The proxy gateway of the communication partner detects the mobile IPv6 node according to the intercepted message;

A22. After the detection is passed, the communication partner agent gateway acts as an agent for the IPv6 communication partner to maintain the information required in the detection process, and responds to the HomeTest message to the home agent of the mobile IPv6 node, and forwards the message to the home agent through the home agent The Home Test message is given to the mobile IPv6 node; and,

Respond to the mobile IPv6 node with a Care-of Test message.

Wherein, said step A also includes:

When the mobile IPv6 node receives the Home Test message and the Care-of Test message that the communication partner proxy gateway responds to, the detection process ends.

Wherein, after the detection process ends, when the mobile IPv6 node registers with the IPv6 communication partner, the step A specifically includes:

A3. The mobile IPv6 node sends a binding update message to the IPv6 communication partner;

A4. The proxy gateway of the communication partner intercepts the binding update message, and processes the binding update message on behalf of the IPv6 communication partner.

Wherein, in step A4, the process of processing the binding update message on behalf of the IPv6 communication partner specifically includes:

A41. The proxy gateway of the communication partner performs legality verification on the intercepted binding update message according to the information maintained in the detection process;

A42. After the verification is passed, record the home address and care-of address of the mobile IPv6 node in the binding update message in the binding cache, and respond to the mobile IPv6 node with a binding confirmation message.

Wherein, after the registration process ends, when the mobile IPv6 node performs data packet interaction with the IPv6 communication partner, the step A specifically includes:

A5, the mobile IPv6 node sends the IPv6 data message to the IPv6 communication partner in a route optimization mode; the destination address of the IPv6 data message is the IPv6 address of the corresponding IPv6 communication partner, and the source address is the care-of address of the mobile IPv6 node;

A6. The communication partner proxy gateway intercepts the IPv6 data message sent by the mobile IPv6 node, and processes the IPv6 data message;

A7. Send the processed IPv6 data message to a corresponding IPv6 communication partner.

Wherein, the step A6 specifically includes:

A61. The communication partner proxy gateway intercepts the IPv6 data message sent by the mobile IPv6 node, and searches and obtains the corresponding home address in the binding cache information according to the care-of address of the mobile IPv6 node;

A62. Replace the found home address with the care-of address in the source address of the data packet;

A63. Discard the destination address extension header of the IPv6 data packet.

Wherein, after the registration process ends, when the mobile IPv6 node performs data packet interaction with the IPv6 communication partner, the step A also includes:

A8. The IPv6 communication partner returns the IPv6 data message to the mobile IPv6 node according to the IPv6 source address of the home address carried in the received data message, and the destination address of the returned IPv6 data message is the The IPv6 home address corresponding to the IPv6 source address;

A9. The proxy gateway of the communication partner intercepts the IPv6 data message, and processes the IPv6 data message;

A10. The proxy gateway of the communication partner sends the processed IPv6 data packet to the mobile IPv6 node for processing.

Wherein, the step A9 specifically includes:

A91. The communication partner proxy gateway intercepts the IPv6 data message, searches for the corresponding care-of address in the corresponding binding cache of the mobile IPv6 node according to the destination address in the data message which is the home address, and when it is confirmed that the When the care-of address is used, it is used to replace the destination address in the data message;

A92. Generate a new IPv6 routing extension header from the processed data packet, and store the IPv6 home address in it.

Wherein, the step A10 specifically includes:

A101. The communication partner proxy gateway sends the converted data message to the mobile IPv6 node according to the IPv6 care-of address;

A102. The mobile IPv6 node receives the data message sent by the communication partner proxy gateway, and replaces the IPv6 care-of address with the IPv6 home address;

A103. Upload the data message to the application layer according to the IPv6 home address, and complete the receiving process of the data message.

As can be seen from the technical solution provided by the present invention above, when a mobile IPv6 node communicates with an IPv6 communication partner using a route optimization method, the present invention communicates between the mobile IPv6 node and the IPv6 communication partner based on the communication partner agent gateway as an agent of the IPv6 communication partner. Interaction information between partners is processed. Through the present invention, not only high-efficiency mobile IPv6 communication can be realized, but also the extended processing of "route optimization" by a large number of communication partners can be completed by a small number of gateway devices, so that a large number of terminal types, such as common IPv6 communication partners, do not have to By providing special support for mobile IPv6, common IPv6 communication partners can communicate with mobile IPv6 nodes in the route optimization mode of mobile IPv6, thereby reducing the upgrade cost and reducing the complexity of implementing IPv6 communication partners. Deployment of mobile IPv6 applications.

Description of drawings

Figure 1 is a schematic diagram of the basic principle of Mobile IPv6 technology;

Fig. 2 realizes the schematic diagram of the principle of communication between a mobile IPv6 node and an IPv6 communication partner through the "route optimization" mode of Mobile IPv6 in the present invention.

Detailed ways

In order to realize the communication between the mobile node and the ordinary communication partner under the routing optimization mode, the present invention provides a method for realizing the communication between the mobile IPv6 node and the IPv6 communication partner. The main idea is: in Mobile IPv6, the communication partner must participate in the " The special message processing of route optimization" mode and the special processing to sending and receiving data messages, so the present invention introduces the role of communication partner agent gateway (abbreviated as CN agent gateway), and completes "route optimization" by acting as an agent for IPv6 communication partners through said CN agent gateway. "Related special treatment, so that any communication partner without extension can communicate with mobile IPv6 nodes in a "route optimization" manner.

The CN proxy gateway can be a default gateway device set in the communication link when the mobile IPv6 node and the IPv6 communication partner perform information interaction, and a default gateway device set in the communication link when the mobile IPv6 node and the IPv6 communication partner perform information interaction. Designate gateway equipment, set up key gateway equipment at the entrance and exit between networks, or set up designated gateway equipment at the entrance and exit between networks.

The core of the present invention is: when a mobile IPv6 node communicates with an IPv6 communication partner using a route optimization method, the CN proxy gateway acts as an agent for the IPv6 communication partner to process the interaction information between the mobile IPv6 node and the IPv6 communication partner .

Before implementing the present invention, the mobile IPv6 node is connected to its home network, and obtains its home address through information interaction with the home network; and,

A mobile IPv6 node detects whether it has roamed to a foreign network through the IPv6 neighbor discovery mechanism. When it finds that it has moved to a foreign network, it obtains the care-of address of the foreign network through the address configuration process.

In the first embodiment provided by the present invention, when a mobile IPv6 node communicates with an IPv6 communication partner using a route optimization method, the exchange information passes through the CN proxy gateway, and the CN proxy gateway needs to determine that it can act as an agent for the IPv6 communication partner to process the mobile IPv6 The specific realization of information exchange between nodes and IPv6 communication partners includes but not limited to the following methods:

The CN proxy gateway determines whether it can process the interaction information between the mobile IPv6 node and the IPv6 communication partner for the communication partner according to the IPv6 neighbor information in the link it maintains;

Or, the CN proxy gateway determines whether it can act as a proxy for the communication partner to process the interaction information between the mobile IPv6 node and the IPv6 communication partner through the routing information;

Or, the CN proxy gateway determines whether it can process the interaction information between the mobile IPv6 node and the IPv6 communication partner for the communication partner through the configuration information thereon.

The implementation process of the present invention is shown in Figure 2, including:

Step (1), register the obtained care-of address with the home agent through a binding update message.

In the "route optimization" mode, the mobile IPv6 node also tries to register with the communication partner. Before registering with the communication partner, according to the requirements of the Mobile IPv6 protocol, the mobile IPv6 node first initiates the Return Routability detection process to the IPv6 communication partner. The specific implementation process includes :

Step (2), the mobile IPv6 node sends the Home Test Init message to its home agent, and sends to the IPv6 communication partner through the home agent; and, sends the Care-of Test Init message to the IPv4 communication partner.

Step (3), the CN proxy gateway intercepts the message sent to the IPv6 communication partner, and processes the intercepted message on behalf of the IPv6 communication partner. During this process, the IPv6 communication partner does not perceive all processes of the CN agent gateway agent, and the specific implementation process is as follows:

Step 1: The CN proxy gateway detects the mobile IPv6 node according to the intercepted message.

Step 2, when the detection is passed, the CN agent gateway acts as an agent for the IPv6 communication partner to maintain the information required in the detection process, such as keygen token, nonce, etc., see RFC 3775 for details, and send the information to the home agent of the mobile IPv6 node Respond to the Home Test message, and forward the Home Test message to the mobile IPv6 node through the home agent; and respond to the Care-of Test message to the mobile IPv6 node.

Step (4), when the mobile IPv6 node receives the HomeTest message and the Care-of Test message that the CN proxy gateway responds to, record relevant information, such as information such as keygen tokens, and then end the detection process.

Step (5), when the detection process ends, the mobile IPv6 node registers with the IPv6 communication partner through a binding update message.

The CN proxy gateway performs legality verification on the intercepted binding update message; when the verification is passed, record the home address, care-of address and survival address of the mobile IPv6 node in the binding update message in the binding cache. Time and other information, and respond to the mobile IPv6 node with a binding confirmation message. Its implementation process is as follows:

Step 1, the mobile IPv6 node sends a binding update message to an IPv6 communication partner.

Step 2, once the CN proxy gateway is confirmed as the proxy of the communication partner, it intercepts the binding update message, and processes the binding update message on behalf of the IPv6 communication partner. Specifically include:

First, the CN proxy gateway verifies the validity of the intercepted binding update message according to the information maintained during the detection process.

After the verification is passed, the CN proxy gateway records information such as the home address and care-of address of the mobile IPv6 node in the binding update message in the binding cache of the mobile IPv6 node, and responds to the mobile IPv6 node with a binding confirmation message .

After the registration process ends, when the mobile IPv6 node performs data packet interaction to the IPv6 communication partner, the specific implementation process includes:

Step (6), the mobile IPv6 node sends the IPv6 data message to the IPv6 communication partner in a route optimization mode.

The destination address of the IPv6 data message is the IPv6 address of the corresponding IPv6 communication partner, and the source address is the care-of address of the mobile IPv6 node; the home address is carried in the destination address extension header of the data message, and then the data message does not pass through the home address Proxy, but directly to the IPv6 communication partner.

Step (7), the CN proxy gateway intercepts the IPv6 data message, and processes the IPv6 data message.

Since the destination address of the data packet is the IPv6 address of the communication partner, the data packet will pass through the CN proxy gateway, and the IPv6 source address at this time is the care-of address. In the present invention, once the CN agent gateway is confirmed as the agent of the communication partner, it first searches for the home address corresponding to the care-of address through the information of the binding cache of the communication partner maintained in step (5), and then sends the address in the data message as The source address of the care-of address is replaced by the found home address, and the CN proxy gateway discards the destination address extension header of the data message. The specific implementation process includes:

Step 1, the CN proxy gateway intercepts the IPv6 data message sent by the mobile IPv6 node, and searches the information in the binding cache according to the care-of address of the mobile IPv6 node to obtain the corresponding home address.

Step 2, replacing the care-of address in the source address of the data packet with the found home address.

Step 3, discarding the destination address extension header of the IPv6 data packet.

Step (8), the CN proxy gateway sends the processed IPv6 data message to the corresponding IPv6 communication partner. The IPv6 communication partner returns an IPv6 data message to the mobile IPv6 node according to the IPv6 source address carried in the received data message, and the destination address of the returned IPv6 data message is the IPv6 hometown corresponding to the mobile node address.

Step (9), the return data packet of the communication partner arrives at the CN proxy gateway. The CN proxy gateway will check whether there is a corresponding record in the corresponding binding cache in the mobile IPv6 node according to the destination address of the data packet, that is, the home address, and if so, replace the destination of the data packet with the care-of address corresponding to the home address address, at the same time, the CN proxy gateway will generate a new IPv6 routing extension header for the converted data packet, and store the home address in it as the second destination address. The specific implementation process includes:

Step 1, the CN proxy gateway intercepts the IPv6 data message, and searches the corresponding binding cache of the mobile IPv6 node for a corresponding care-of address according to the destination address of the home address in the data message, and when it is confirmed, Then use the care-of address to replace the destination address in the data packet.

Step 2, generate a new IPv6 routing extension header from the processed data message, and save the IPv6 home address in it.

Step (10), the CN proxy gateway sends the processed IPv6 data message to the mobile IPv6 node for processing.

The first destination address of the processed data message is the care-of address, which will be directly sent to the mobile node in the foreign network without transiting through the home agent. After receiving the data packet from the communication partner, the mobile node replaces the destination address with the second destination address, that is, the home address, and continues to send it to itself to complete the receiving and processing of the data packet. The specific implementation process includes:

Step 1, the CN proxy gateway sends the converted IPv6 data message to the mobile IPv6 node according to the IPv6 care-of address;

Since the first destination address of the converted data message is the care-of address, it will be directly sent to the mobile IPv6 node in the foreign network without transiting through the home agent.

Step 2, the mobile IPv6 node receives the IPv6 data packet sent by the CN proxy gateway, and replaces the IPv6 care-of address with the IPv6 home address.

Step 3: Upload the IPv6 data message to the application layer according to the IPv6 home address, and complete the receiving and processing of the data message.

In Step 2 and Step 3, after receiving the data message sent by the communication partner, the mobile IPv6 node replaces the destination address with the second destination address, that is, the home address, and continues to send it to itself to complete the reception of the data message deal with.

In the above embodiment, because the CN proxy gateway needs to modify the data message, such as modifying the source address and destination address of the data message, or discarding the destination address extension header of the data message, it may be necessary to modify the payload address in the data message. check and. When modifying the checksum of the Payload in the data message, the checksum can be fine-tuned according to the content difference before and after modification without recalculation.

As can be seen from the technical solution provided by the present invention above, when a mobile IPv6 node communicates with an IPv6 communication partner using a route optimization method, the present invention communicates between the mobile IPv6 node and the IPv6 communication partner based on the communication partner agent gateway as an agent of the IPv6 communication partner. Interaction information between partners is processed. Through the present invention, not only high-efficiency mobile IPv6 communication can be realized, but also the extended processing of "route optimization" by a large number of communication partners can be completed by a small number of gateway devices, so that a large number of terminal types, such as common IPv6 communication partners, do not have to By providing special support for mobile IPv6, common IPv6 communication partners can communicate with mobile IPv6 nodes in the route optimization mode of mobile IPv6, thereby reducing the upgrade cost and reducing the complexity of implementing IPv6 communication partners. Deployment of mobile IPv6 applications.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (14)

1, a kind of method that realizes IPv6 communication partner to support the routing optimization of mobile IPv6, it is characterized in that, comprising: A. When a mobile IPv6 node communicates with an IPv6 communication partner in a route optimization manner, the communication partner-based proxy gateway acts as an agent for the IPv6 communication partner to process the interaction information between the mobile IPv6 node and the IPv6 communication partner. 2. The method according to claim 1, wherein the communication partner agent gateway comprises: Set the default gateway device in the communication link when the mobile IPv6 node exchanges information with the IPv6 communication partner, set the designated gateway device in the communication link when the mobile IPv6 node exchanges information with the IPv6 communication partner, and set it in the network The key gateway device at the entrance and exit of the network, or the designated gateway device set at the entrance and exit of the network. 3. The method according to claim 2, characterized in that, before the step A, comprising: The communication partner proxy gateway determines that it can process the interaction information between the mobile IPv6 node and the IPv6 communication partner for the communication partner according to the IPv6 neighbor information in the link it maintains; or, The communication partner proxy gateway determines through the routing information that it can process the interaction information between the mobile IPv6 node and the IPv6 communication partner as a proxy for the communication partner; or, The communication partner proxy gateway determines through the configuration information thereon that it can process the interaction information between the mobile IPv6 node and the IPv6 communication partner for the communication partner proxy. 4. The method according to claim 3, characterized in that, before the step A, comprising: The mobile IPv6 node is connected to its home network, and obtains its home address through information interaction with the home network; as well as, The mobile IPv6 node detects whether it has roamed to a foreign network through the IPv6 neighbor discovery mechanism. When it finds that it has moved to a foreign network, it obtains the care-of address of the foreign network through the address configuration process; The obtained care-of address is registered on the home agent through a binding update message. 5. The method according to claim 4, wherein when the mobile IPv6 node initiates a detection process to the IPv6 communication partner before registering the obtained care-of address with the IPv6 communication partner, the step A specifically include: A1. The mobile IPv6 node sends a Home Test Init message to its home agent, and sends it to an IPv6 communication partner through the home agent; and, Send Care-of Test Init message to IPv6 communication partner; A2. The communication partner proxy gateway intercepts the message sent to the IPv6 communication partner, and processes the intercepted message on behalf of the IPv6 communication partner. 6. The method according to claim 5, characterized in that, in step A2, the process of processing the intercepted message on behalf of the IPv6 communication partner specifically includes: A21. The proxy gateway of the communication partner detects the mobile IPv6 node according to the intercepted message; A22. After the detection is passed, the communication partner agent gateway acts as an agent for the IPv6 communication partner to maintain the information required in the detection process, and responds to the HomeTest message to the home agent of the mobile IPv6 node, and forwards the message to the home agent through the home agent The Home Test message is given to the mobile IPv6 node; and, Respond to the mobile IPv6 node with a Care-of Test message. 7. The method according to claim 6, wherein said step A further comprises: When the mobile IPv6 node receives the Home Test message and the Care-of Test message that the communication partner proxy gateway responds to, the detection process ends. 8. The method according to claim 4, characterized in that, when the mobile IPv6 node registers with an IPv6 communication partner after the detection process ends, the step A specifically includes: A3. The mobile IPv6 node sends a binding update message to the IPv6 communication partner; A4. The proxy gateway of the communication partner intercepts the binding update message, and processes the binding update message on behalf of the IPv6 communication partner. 9. The method according to claim 8, wherein in step A4, the process of processing the binding update message on behalf of the IPv6 communication partner specifically includes: A41. The proxy gateway of the communication partner performs legality verification on the intercepted binding update message according to the information maintained in the detection process; A42. After the verification is passed, record the home address and care-of address of the mobile IPv6 node in the binding update message in the binding cache, and respond to the mobile IPv6 node with a binding confirmation message. 10. The method according to claim 4, characterized in that, when the mobile IPv6 node exchanges data packets with the IPv6 communication partner after the registration process ends, the step A specifically includes: A5, the mobile IPv6 node sends the IPv6 data message to the IPv6 communication partner in a route optimization mode; the destination address of the IPv6 data message is the IPv6 address of the corresponding IPv6 communication partner, and the source address is the care-of address of the mobile IPv6 node; A6. The communication partner proxy gateway intercepts the IPv6 data message sent by the mobile IPv6 node, and processes the IPv6 data message; A7. Send the processed IPv6 data message to a corresponding IPv6 communication partner. 11. The method according to claim 10, characterized in that the step A6 specifically comprises: A61. The communication partner proxy gateway intercepts the IPv6 data message sent by the mobile IPv6 node, and searches and obtains the corresponding home address in the binding cache information according to the care-of address of the mobile IPv6 node; A62. Replace the found home address with the care-of address in the source address of the data packet; A63. Discard the destination address extension header of the IPv6 data message. 12. The method according to claim 10, characterized in that, when the mobile IPv6 node exchanges data packets with the IPv6 communication partner after the registration process is completed, the step A further comprises: A8. The IPv6 communication partner returns the IPv6 data message to the mobile IPv6 node according to the IPv6 source address of the home address carried in the received data message, and the destination address of the returned IPv6 data message is the The IPv6 home address corresponding to the IPv6 source address; A9. The proxy gateway of the communication partner intercepts the IPv6 data message, and processes the IPv6 data message; A10. The proxy gateway of the communication partner sends the processed IPv6 data packet to the mobile IPv6 node for processing. 13. The method according to claim 12, characterized in that the step A9 specifically includes: A91. The communication partner proxy gateway intercepts the IPv6 data message, searches for the corresponding care-of address in the corresponding binding cache of the mobile IPv6 node according to the destination address in the data message which is the home address, and when it is confirmed that the When the care-of address is used, it is used to replace the destination address in the data message; A92. Generate a new IPv6 routing extension header from the processed data packet, and store the IPv6 home address in it. 14. The method according to claim 12, characterized in that the step A10 specifically comprises: A101. The communication partner proxy gateway sends the converted data message to the mobile IPv6 node according to the IPv6 care-of address; A102. The mobile IPv6 node receives the data message sent by the communication partner proxy gateway, and replaces the IPv6 care-of address with the IPv6 home address; A103. Upload the data message to the application layer according to the IPv6 home address, and complete the receiving process of the data message.

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