CN115767510B - Ipv6 self-adaptive networking method, system and PD client - Google Patents

Abstract

The application discloses an ipv6 self-adaptive networking method, an ipv6 self-adaptive networking system and a PD client, which relate to the technical field of wireless communication and comprise the steps that the PD (prefix allocation) client sends a PD request message to a PD server and receives a PD reply message. When the PD client determines that the PD reply message does not contain legal prefix address segments, 128-bit subnet masks are added to other address segments to obtain an ipv6 address of the PD client wan (wide area network) side, and prefix routes of the PD client wan side and the lan (local area network) side are obtained according to the ipv6 address. And the PD client obtains an ipv6 address pool of the lan side according to the prefix route of the lan side, and issues the prefix route of the lan side or an ipv6 address in the ipv6 address pool to the down-hanging terminal according to the configuration state so as to realize networking. The application can adaptively adjust the routing strategy and generate different prefixes to be sent to the down-hanging terminal when the PD server does not reply a legal prefix address segment to the PD client, is compatible with the abnormal behavior of the down-hanging terminal, adjusts the address allocation mode and ensures the success of the ad hoc network.

Description

IPv6 adaptive networking method, system and PD client

Technical Field

The present application relates to the field of wireless communication technology, and in particular to an IPv6 adaptive networking method, system and PD client.

Background technique

The RFC3633 standard defines a DHCPV6-PD (Prefix Delegation, PD is the abbreviation of prefix delegation) mode, which is specifically used for automatic prefix allocation. DHCPV6-PD is an extension of DHCPV6. Traditional DHCPV6 focuses on passing network configuration parameters such as addresses from the server to the ipv6 client host, while DHCPV6-PD focuses on prefix allocation, that is, the PD server sends a prefix address segment of a subnet range and other network configuration information such as DNS to the PD client, which means that the PD server sends a subnet address segment instead of a specific ipv6 address that can be directly used by the ipv6 client host. The PD client allocates this subnet address segment to the ipv6 client host (or downstream terminal) according to the configured environment, such as stateful or stateless.

However, the RFC3633 standard does not explicitly state that the PD server must reply to the PD client's PD request. Therefore, as shown in Figure 1, when the PD client requests PD, the following three problems may occur:

1. After the PD client requests PD in the DHCPV6 message, the PD server does not reply to the PD request, resulting in no available prefix for the downstream terminal. This is one of the scenarios where the PD client does not receive the legal PD sent by the PD server.

2. After the PD server requests PD in the DHCPV6 message, the PD server replies to the PD request, but the 64-bit prefix address segment contained in the reply content is the same as the prefix of the PD client wan side connected to the ipv6 network. According to the standard protocol process, the PD client wan side prefix is the same as the lan side prefix, which causes lan-wan forwarding to be abnormal. This is the second scenario where the PD client does not receive the legal PD sent by the PD server.

3. After the PD client requests PD in the DHCPv6 message, the PD server replies with a valid PD, but some downstream terminals do not process the RA message according to the protocol standard process, resulting in the downstream terminals not using the prefix in the stateless message to calculate the IPv6 address in a stateless environment, resulting in the inability to access the IPv6 network.

Summary of the invention

In response to the defects existing in the prior art, the purpose of this application is to provide an IPv6 adaptive networking method, system and PD client, which can adaptively adjust the routing strategy and generate different prefixes to be sent to the downstream terminals when the PD server does not reply to the PD client with a valid prefix address segment, and is compatible with the abnormal behavior of the downstream terminals, adjusts the address allocation method, and ensures the success of the self-organizing network.

In order to achieve the above objectives, the technical solutions adopted are:

The first aspect of the present application provides an ipv6 adaptive networking method, comprising:

The PD client sends a PD request message to the PD server and receives a PD reply message from the PD server;

When the PD client determines that the PD reply message does not contain a legal prefix address segment, it adds a 128-bit subnet mask to other address segments in the PD reply message to obtain the IPv6 address of the PD client WAN side, and obtains the prefix routes of the PD client WAN side and LAN side according to the IPv6 address;

The PD client obtains the IPv6 address pool on its LAN side according to the prefix routing on its LAN side;

The PD client sends the prefix routing of its LAN side or the ipv6 address in the ipv6 address pool to the downstream terminal according to the configuration status to realize networking.

In some embodiments, the PD reply message does not contain a legal prefix address segment, which means that the PD reply message does not contain a prefix address segment, or the prefix address segment in the PD reply message is the same as the prefix route on the PD client wan side.

In some embodiments, the specific steps of the PD client determining whether the PD reply message contains a legal prefix address segment are as follows:

The PD client determines whether the PD reply message does not contain a prefix address segment. If so, it is determined that the PD reply message does not contain a legal prefix address segment; if not, the PD client adds a 64-bit subnet mask to other address segments in the PD reply message to obtain the IPv6 address of the PD client WAN side, and obtains the prefix route of the PD client WAN side according to the IPv6 address. The PD client compares the prefix route of its WAN side with the prefix address segment in the PD reply message, and when the comparison result is the same, it is determined that the PD reply message does not contain a legal prefix address segment; when the comparison result is different, it is determined that the PD reply message contains a legal prefix address segment.

In some embodiments, after the PD client determines that the PD reply message contains a prefix address segment and the prefix address segment is the same as the prefix route on the PD client wan side, the PD client adds the 128-bit subnet mask to other address segments in the PD reply message to update the IPv6 address on the PD client wan side, and updates the prefix route on the PD client wan side according to the updated IPv6 address.

In some embodiments, the method further comprises:

After the PD client obtains the prefix route on its WAN side through the PD reply message, it adds multiple default routes on its WAN side according to the user input.

In some embodiments, the specific steps for the PD client to obtain the prefix route on its LAN side according to its ipv6 address on its WAN side are as follows:

The PD client uses NAT (Network Address Translation) rules to extract 64 bits from the IPv6 address on its WAN side as the prefix route on its LAN side.

In some embodiments, when the PD client is configured as stateless, it receives an RS (route request) message sent by a downstream terminal, and after replying an RA (route advertisement) message to the downstream terminal, it monitors whether an IPv6 message request for a stateful address is received.

In some embodiments, the PD client sends the prefix routing of its LAN side or the IPv6 address in the IPv6 address pool to the downstream terminal according to the configuration status to realize networking, which specifically includes the following steps:

The PD client receives the RS message sent by the downstream terminal, and replies with an RA message to the downstream terminal;

When the PD client determines that the current configuration is stateless and receives an IPv6 message request for a stateful address sent by a downstream terminal, the PD client selects an IPv6 address from the IPv6 address pool and sends it to the downstream terminal to achieve networking.

The second aspect of the present application provides a PD client based on the ipv6 adaptive networking method.

The third aspect of the present application provides an IPv6 adaptive networking system, based on the IPv6 adaptive networking method, comprising a PD server, a PD client, and a downstream terminal, wherein the PD client is used to send a PD request message to the PD server and receive a PD reply message replied by the PD server, and the system further comprises an adaptive control module arranged in the PD client;

The adaptive control module is used for adding a 128-bit subnet mask to other address segments in the PD reply message to obtain the ipv6 address of the PD client wan side when it is determined that the PD reply message does not contain a legal prefix address segment, obtaining the prefix routes of the PD client wan side and lan side according to the ipv6 address, and obtaining the ipv6 address pool of the PD client lan side according to the prefix route of the PD client lan side;

The adaptive control module is also used to send the prefix routing of the LAN side of the PD client or the ipv6 address in the ipv6 address pool to the downstream terminal according to the configuration status to realize networking.

The beneficial effects of the technical solution provided by this application include:

When the PD client determines that the PD reply message does not contain a legal prefix address segment, it adds a 128-bit subnet mask to the other address segments to obtain the IPv6 address of the WAN side, and obtains the prefix route of the LAN side based on the IPv6 address. Based on the prefix route of the LAN side of the PD client, the purpose of sending a usable prefix or a usable address to the downstream terminal can be achieved, so that the downstream terminal can process and obtain a suitable IPv6 address to realize networking, avoiding the problem that the PD client cannot send a usable prefix or a usable address to the downstream terminal when it does not receive a legal prefix address segment.

When the PD client detects that the current configuration is a stateless environment but still receives an IPv6 message request for a stateful address sent by a downstream terminal, it will no longer follow the address distribution strategy of the stateless environment, but will follow the address distribution strategy of the stateful environment, select an IPv6 address from the IPv6 address pool and distribute it to the downstream terminal, so that the downstream terminal can achieve networking, thereby achieving compatibility with abnormal behaviors of the downstream terminal, flexibly adjusting the address allocation method, and ensuring the success of self-organizing networking.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a flow chart of a PD client requesting a PD in the prior art.

FIG. 2 is a flow chart of an ipv6 adaptive networking method according to an embodiment of the present invention.

FIG3 is a flow chart showing the process in which the PD client determines whether the PD reply message contains a legal prefix address segment in step S2.

FIG. 4 is a schematic flow chart of step S4 .

Detailed ways

The present application is further described in detail below with reference to the accompanying drawings and embodiments.

Under normal circumstances, the PD reply message should contain the prefix address segment and other address segments. However, in some abnormal circumstances, the PD reply message contains other address segments, but may not contain the prefix address segment, or the included prefix address segment is abnormal.

Under normal circumstances, the PD client can obtain the IPv6 address of the PD client WAN side according to other address segments included in the PD reply message in a conventional manner, and further obtain the prefix route of the PD client WAN side according to the IPv6 address. The PD client can also obtain the prefix route of the PD client LAN side according to the prefix address segment included in the PD reply message in a conventional manner, and obtain the IPv6 address pool of its LAN side according to the prefix route of its LAN side. When a downstream terminal wants to access the IPv6 network, that is, to establish a communication connection with the PD client, the PD client can use the prefix route of its LAN side as an available prefix when the configuration environment is stateless, or send the IPv6 address in the IPv6 address pool as an available address to the downstream terminal when the configuration environment is stateful, so that the downstream terminal can access the IPv6 network and realize networking.

However, when the PD reply message does not contain the prefix address segment, the PD client cannot obtain other address segments from the PD reply message, resulting in the inability to generate the prefix route on the PD client LAN side, and the downstream terminal cannot obtain the available prefix or available address, and networking cannot be achieved. When the prefix address segment contained in the PD reply message is abnormal, the prefix route on the PD client LAN side obtained by the PD client based on the prefix address segment will also be abnormal, and the available prefix or available address obtained by the downstream terminal will also be abnormal, and networking cannot be achieved.

Therefore, an embodiment of the present invention provides an ipv6 adaptive networking method, when the PD client determines that the PD reply message does not contain a legal prefix address segment, a 128-bit subnet mask is added to other address segments contained in the PD reply message to obtain the ipv6 address of the PD client wan side, and the prefix routes of the PD client wan side and lan side are obtained according to the ipv6 address, and the ipv6 address pool of the PD client lan side is obtained according to the prefix route of the PD client lan side. The PD client sends the prefix route of its lan side or the ipv6 address in the above ipv6 address pool to the downstream terminal according to the configuration status to realize networking.

In this embodiment, when the PD client determines that the PD reply message does not contain a legal prefix address segment, the ipv6 address of the PD client wan side is obtained by adding a 128-bit subnet mask to other address segments, and the prefix route of the PD client wan side is obtained according to the ipv6 address, and the prefix route of the PD client lan side is obtained at the same time (rather than adding a 64-bit subnet mask to other address segments to obtain the ipv6 address of the PD client wan side according to the conventional method, and only obtaining the prefix route of the PD client wan side according to the ipv6 address). The prefix route of the PD client lan side is obtained by the above method, or the ipv6 address pool of the PD client lan side is further obtained according to the prefix route of the PD client lan side, which can ensure that the downstream terminal can obtain an available prefix or an available address, thereby ensuring that the downstream terminal can successfully access the PD client, avoiding the problem of being unable to send an available prefix or an available address to the downstream terminal when the PD client does not receive a legal prefix address segment.

As shown in FIG. 2 , in a specific embodiment, the ipv6 adaptive networking method includes:

Step S1: The PD client sends a PD request message to the PD server, and receives a PD reply message from the PD server.

Step S2: When the PD client determines that the PD reply message does not contain a legal prefix address segment, it adds a 128-bit subnet mask to other address segments in the PD reply message to obtain the IPv6 address of the PD client WAN side, and obtains the prefix routes of the PD client WAN side and LAN side according to the IPv6 address.

Step S3: The PD client obtains the IPv6 address pool on its LAN side according to the prefix routing on its LAN side.

Step S4: The PD client sends the prefix routing on its LAN side or the IPv6 address in the IPv6 address pool to the downstream terminal according to the configuration status to realize networking.

In this embodiment, after the PD client sends a PD request message to the PD server, it receives a PD reply message from the PD server. The PD reply message may or may not contain a legal prefix address segment, but the PD reply message will always contain other address segments. The IPv6 address of the PD client wan side can be obtained by processing the other address segments according to conventional methods. The prefix route of the PD client wan side can be further processed according to the IPv6 address of the PD client wan side. The prefix route of the PD client wan side obtained according to conventional methods can be used to determine whether the prefix address segment in the PD reply message is legal.

Based on the above embodiment, the PD reply message does not contain a legal prefix address segment, which means that the PD reply message does not contain a prefix address segment, or the prefix address segment in the PD reply message is the same as the prefix route on the PD client wan side.

Specifically, as shown in FIG3 , in step S2 , the specific steps for the PD client to determine whether the PD reply message contains a legal prefix address segment are as follows:

Step S21a: The PD client determines whether the PD reply message does not contain the prefix address segment:

If yes, go to step S25a.

If not, go to step S22a.

Step S22a: The PD client adds a 64-bit subnet mask to other address segments in the PD reply message to obtain the IPv6 address of the PD client WAN side, and obtains the prefix route of the PD client WAN side according to the IPv6 address.

Step S23a, the PD client determines whether the prefix route on its wan side is the same as the prefix address segment in the PD reply message:

If yes, go to step S25a.

If not, go to step S24a.

Step S24a: The PD client determines whether the PD reply message contains a legal prefix address segment.

Step S25a: The PD client determines that the PD reply message does not contain a legal prefix address segment.

Furthermore, after the PD client determines that the PD reply message contains a prefix address segment and the prefix address segment is the same as the prefix route on the PD client wan side, it adds a 128-bit subnet mask to other address segments in the PD reply message to update the IPv6 address on the PD client wan side, and updates the prefix route on the PD client wan side according to the updated IPv6 address.

In this embodiment, if the PD client determines that the PD reply message does not contain a prefix address segment, the PD client directly determines that the PD reply message does not contain a legal prefix address segment. Subsequently, the PD client adaptively adjusts the routing strategy according to the fact that the PD reply message does not contain a legal prefix address segment, that is, adds a 128-bit subnet mask to other address segments in the PD reply message to obtain the ipv6 address of the wan side of the PD client, and obtains the prefix routes of the wan side and lan side of the PD client based on the ipv6 address. The PD client obtains the ipv6 address pool on its lan side based on the prefix route on its lan side. The PD client sends the prefix route on its lan side or the ipv6 address in the ipv6 address pool to the downstream terminal based on the configuration status to achieve networking.

If the PD client determines the prefix address segment included in the PD reply message, but the prefix address segment is the same as the prefix route on the PD client WAN side obtained by the PD client according to the conventional method, the PD client determines that the PD reply message does not contain a legal prefix address segment. Subsequently, the PD client adaptively adjusts the routing strategy according to the fact that the PD reply message does not contain a legal prefix address segment, that is, the PD client can add a 128-bit subnet mask to other address segments in the PD reply message to obtain a new IPv6 address on the PD client WAN side, and update the IPv6 address on the PD client WAN side obtained according to the conventional method according to the IPv6 address. Further, the prefix route on the PD client WAN side is updated according to the updated IPv6 address, and the prefix route on the PD client LAN side is obtained according to the updated IPv6 address. Based on the prefix route on the PD client LAN side, the purpose of sending available prefixes or available addresses to the downstream terminals can be achieved, so that the downstream terminals can process and obtain suitable IPv6 addresses to realize networking.

In another specific embodiment, when the PD client determines that the PD reply message contains a legal prefix address segment, the prefix address segment in the PD reply message is used as the prefix route on the LAN side of the PD client, and the IPv6 address pool on the LAN side of the PD client is obtained based on the prefix route on the LAN side of the PD client.

In this embodiment, under normal circumstances, the PD client can obtain the IPv6 address of the PD client WAN side according to other address segments included in the PD reply message in a conventional manner, and further obtain the prefix route of the PD client WAN side according to the IPv6 address. The PD client can also obtain the prefix route of the PD client LAN side according to the prefix address segment included in the PD reply message in a conventional manner, and obtain the IPv6 address pool of its LAN side according to the prefix route of its LAN side. When a downstream terminal wants to access the IPv6 network, that is, to establish a communication connection with the PD client, the PD client can use the prefix route of its LAN side as an available prefix when the configuration environment is stateless, or send the IPv6 address in the IPv6 address pool as an available address to the downstream terminal when the configuration environment is stateful, so that the downstream terminal can access the IPv6 network and realize networking.

In another specific embodiment, the method further includes adding a plurality of default routes on its wan side according to user input after the PD client obtains the prefix route on its wan side through the PD reply message.

In this embodiment, the number of messages that can be forwarded by the PD client can be increased by adding a default route on the WAN side.

In another specific embodiment, the PD client obtains the prefix route on its LAN side according to the IPv6 address on its WAN side, which specifically means that the PD client uses the NAT (Network Address Translation) rule to extract 64 bits from the IPv6 address on its WAN side as the prefix route on its LAN side.

In this embodiment, when the PD client determines that the PD reply message does not contain a legal prefix address segment, the IPv6 address on the WAN side is obtained by adding a 128-bit subnet mask to other address segments, and the NAT (Network Address Translation) rule is used to extract 64 bits from the IPv6 address on the WAN side as the prefix route on the LAN side. According to the prefix route on the LAN side, the purpose of sending an available prefix (i.e., the prefix route on the LAN side) or an available address (i.e., the IPv6 address in the IPv6 address pool) to the downstream terminal can be achieved, so that the downstream terminal can process and obtain a suitable IPv6 address to realize self-organizing networking, avoiding the problem that the available prefix or available address cannot be sent to the downstream terminal when the PD client does not receive a legal prefix address segment.

Based on the above embodiment, as shown in FIG4 , step S4 specifically includes the following steps:

Step S41: The PD client receives an RS (Router Solicitation) message sent by the downstream terminal, and replies with an RA message to the downstream terminal;

Step S42: The PD client determines whether the configuration state is stateful:

If yes, go to step S44.

If not, go to step S43.

Step S43: The PD client monitors whether an IPv6 message request for a stateful address is received:

If yes, go to step S44.

If not, go to step S45.

Step S44: The PD client selects an IPv6 address from the IPv6 address pool and sends it to the downstream terminal to achieve networking.

Step S45: The downstream terminal obtains the pv6 address based on the prefix routing of the PD client LAN side in the RA message and its own address information to realize networking.

In this embodiment, when the M flag in the RA message is 1, it indicates that the current environment is a stateful environment, and the PD client can reply to the IPv6 message request (such as a solicit message) of the downstream terminal requesting a stateful address. When the M flag in the RA message is 0, it indicates that the current environment is a stateless environment, and the PD client can reply to the IPv6 message request of the downstream terminal requesting a stateless address.

Through RA messages, the PD client can inform the downstream terminal whether the current environment is stateful or stateless. If it continues to receive IPv6 messages requesting stateful addresses in a stateless environment, it means that there is a problem with the downstream terminal that sent the message. If the normal process is followed, the PD client will not reply to the problematic downstream terminal, and the downstream terminal will not be able to obtain an available address, resulting in the inability to implement self-organizing networking.

After the PD client requests PD in the PD request message, the PD server replies with a PD reply message containing a valid PD. When networking, the downstream terminal sends an RS message to the PD client, and then receives an RA message from the PD client. The RA message contains the prefix route on the LAN side, and the PD client can configure the current environment in the RA message as stateful or stateless, that is, the PD client can inform the downstream terminal through the RA message whether the current environment is stateful or stateless.

When the downstream terminal is normal, it can identify whether the environment state contained in the RA message is stateful or stateless, and different processing methods can be selected for different environment states to obtain an ipv6 address that can access the PD client. Specifically, if the downstream terminal identifies that the current configuration in the RA message is a stateful environment, then under normal circumstances, according to the standard process, the downstream terminal needs to send an ipv6 message request for a stateful address to the PD client again, and the PD client selects an ipv6 address from the ipv6 address pool and sends it to the downstream terminal. The downstream terminal uses the ipv6 address to access the PD client to achieve networking. If the downstream terminal identifies that the current configuration in the RA message is a stateless environment, then under normal circumstances, according to the standard process, the downstream terminal uses the lan-side prefix route contained in the RA message as an available prefix, combines the available prefix and the address information of the downstream terminal itself to calculate and generate an ipv6 address, and the downstream terminal uses the ipv6 address to access the PD client to achieve networking.

However, when some downstream terminals have abnormalities, they cannot recognize that the current configuration in the RA message is a stateless environment, but continue to follow the operating steps for the current configuration as a stateful environment, and send an ipv6 message request for a stateful address to the PD client. After the PD client receives this request, it can be known that the downstream terminal has a fault. In the prior art, the PD client will not continue to reply to the faulty terminal, which will cause the faulty terminal to be unable to access the PD client and be unable to form a network. However, through the above steps S61-S64, when the PD client detects that the current configuration is a stateless environment but still receives an ipv6 message request for a stateful address sent by the downstream terminal, it will no longer follow the address delivery policy of the stateless environment, but will follow the address delivery policy of the stateful environment, select an ipv6 address from the ipv6 address pool and send it to the downstream terminal, so that the downstream terminal can be networked, can be compatible with the abnormal behavior of the downstream terminal, adjust the address allocation method, and ensure the success of self-organizing network.

The present invention also provides an embodiment of an IPv6 adaptive networking system, in which an adaptive control module is provided in the PD client of the system. The adaptive control module is used to add a 128-bit subnet mask to other address segments in the PD reply message to obtain the IPv6 address of the PD client WAN side when it is determined that the PD reply message does not contain a legal prefix address segment, obtain the prefix routes of the PD client WAN side and LAN side according to the IPv6 address, and obtain the IPv6 address pool of the PD client LAN side according to the prefix route of the PD client LAN side.

The adaptive control module is also used to send the prefix route on the LAN side of the PD client or the ipv6 address in the ipv6 address pool to the downstream terminal according to the configuration status to realize networking.

In this embodiment, by adding an adaptive control module, the environment is adaptively adapted without adding new configuration commands and function switches, so as to be compatible with the original existing network environment deployment and reduce operation and maintenance costs. The problem that the PD has different configurations due to the particularity of the existing network environment, so that the downstream terminal has no IPv6 address, is solved. The problem that some terminal behaviors do not comply with the protocol specifications, resulting in the inability to obtain IPv6 addresses, is solved.

The present application is not limited to the above-mentioned implementation modes. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims (9)

1. An ipv6 adaptive networking method, comprising:

The PD client side sends a PD request message to the PD server side and receives a PD reply message replied by the PD server side;

When judging that the PD reply message does not contain legal prefix address segments, the PD client adds 128-bit subnet masks to other address segments in the PD reply message to obtain an ipv6 address of the PD client wan side, and obtains prefix routes of the PD client wan side and the lan side according to the ipv6 address; the PD reply message does not contain legal prefix address field, the PD reply message does not contain prefix address field, or the prefix address field in the PD reply message is the same as the prefix route of the PD client wan side;

the PD client obtains an ipv6 address pool of the lan side according to the prefix route of the lan side;

and the PD client transmits the prefix route of the lan side or the ipv6 address in the ipv6 address pool to the down-hanging terminal according to the configuration state so as to realize networking.

2. The ipv6 adaptive networking method according to claim 1, wherein the specific step of the PD client determining whether the PD reply message includes a legal prefix address segment is as follows:

the PD client side judges whether the PD reply message does not contain a prefix address segment, if yes, the PD reply message does not contain a legal prefix address segment; if not, the PD client adds 64-bit subnet mask to other address fields in the PD reply message to obtain an ipv6 address of the PD client wan side, obtains a prefix route of the PD client wan side according to the ipv6 address, compares the prefix route of the PD client wan side with the prefix address field in the PD reply message, judges that the PD reply message does not contain legal prefix address fields when the comparison result is the same, and judges that the PD reply message contains legal prefix address fields when the comparison result is different.

3. The ipv6 adaptive networking method according to claim 2, wherein the PD client adds the 128-bit subnet mask to other address fields in the PD reply message to update the ipv6 address on the PD client wan side and updates the prefix route on the PD client wan side according to the updated ipv6 address after determining that the PD reply message contains the prefix address field and the prefix address field is the same as the prefix route on the PD client wan side.

4. An ipv6 adaptive networking method according to claim 1, further comprising:

After obtaining the prefix route of the wan side of the PD client through the PD reply message, the PD client adds a plurality of default routes on the wan side of the PD client according to user input.

5. The ipv6 adaptive networking method according to claim 1, wherein the specific steps of the PD client obtaining the lan-side prefix route according to the ipv6 address of the wan side are as follows:

The PD client extracts 64 bits from the ipv6 address on its wan side as its lan side prefix route using the network address translation nat rule.

6. The ipv6 adaptive networking method according to claim 1, wherein when the PD client is configured to be stateless, the PD client receives a route request RS message sent by the down-hanging terminal, and monitors whether an ipv6 message request requesting a stateful address is received after replying a route notification RA message to the down-hanging terminal.

7. The ipv6 adaptive networking method according to claim 6, wherein the PD client routes a prefix on its lan side or issues an ipv6 address in the ipv6 address pool to the down-hanging terminal according to the configuration state, so as to implement networking, and specifically includes the following steps:

The PD client receives the RS message sent by the down-hanging terminal and replies an RA message to the down-hanging terminal;

And when judging that the current configuration is stateless and receiving an ipv6 message request which is sent by the down-hanging terminal and requests a stateful address, the PD client selects an ipv6 address from the ipv6 address pool and sends the ipv6 address to the down-hanging terminal so as to realize networking.

8. A PD client, characterized in that it is based on the ipv6 adaptive networking method of any one of claims 1-7.

9. An ipv6 adaptive networking system, characterized in that, based on the ipv6 adaptive networking method of any one of claims 1-7, the system includes a PD server, a PD client, and a down-hanging terminal, where the PD client is configured to send a PD request message to the PD server and receive a PD reply message replied by the PD server, and the system further includes an adaptive control module disposed in the PD client;

the self-adaptive control module is used for adding 128-bit subnet masks to other address fields in the PD reply message to obtain an ipv6 address of the PD client wan side when judging that the PD reply message does not contain legal prefix address fields, obtaining prefix routes of the PD client wan side and the lan side according to the ipv6 address, and obtaining an ipv6 address pool of the PD client lan side according to the prefix routes of the PD client lan side;

the self-adaptive control module is also used for issuing a prefix route of the PD client lan side or an ipv6 address in an ipv6 address pool to the down-hanging terminal according to the configuration state so as to realize networking.