CN103916484B - The method and apparatus for configuring IP address - Google Patents

Abstract

Method and device for configuring an IP address. Provided is a terminal device, including a sending unit, a receiving unit and a processing unit. The sending unit is used for sending a router request RS message. The receiving unit is configured to receive a first router advertisement RA message, the first RA message is used to respond to the RS message, and carries a first IPv6 prefix and a first accessible network segment corresponding to the first IPv6 prefix. The processing unit is configured to generate a first IPv6 address according to the first IPv6 prefix, and configure a first address selection policy table according to the first RA message. The first address selection policy table includes the first IPv6 address and the first accessible network segment corresponding to the first IPv6 address, and the first accessible network segment is used to identify that the terminal device uses the A network segment that can be accessed when the first IPv6 address is used as the source address. With this solution, the address selection policy table can be automatically configured in the stateless address automatic configuration mode.

Description

Method and device for configuring IP address

technical field

The embodiment of the present invention relates to the communication field, and in particular to a method and device for configuring an IP address.

Background technique

Due to the shortage of Internet Protocol version 4 (IPv4 for short) addresses on the public network, many operators have begun to deploy Internet Protocol version 6 (IPv6 for short) networks to solve the problem after the IPv4 addresses on the public network are exhausted. business development issues. With the deployment of IPv6 networks, new network models and service models have emerged. In some models, the customer edge (Customer Edge, CE for short) needs to connect to different Internet service providers (Internet service provider, ISP for short), and obtain different IPv6 prefixes from different ISPs. Then, according to the obtained IPv6 prefix, the CE provides IPv6 terminal devices, such as IPv6 hosts ( host), configure an IPv6 address.

The IETF has proposed a scheme for address allocation. CE obtains multiple IPv6 prefixes from multiple ISPs, and assigns multiple IPv6 addresses to all terminal devices through DHCPv6 or SLAAC. When using the DHCPv6 mode, the CE assigns multiple IPv6 addresses to each terminal device according to the number of obtained prefixes, and the number of addresses is the same as the number of obtained IPv6 prefixes. When the SLAAC mode is adopted, the CE notifies each terminal device of all IPv6 prefixes through a Router Advertisement (RA) message, and each terminal device generates multiple IPv6 addresses according to the acquired IPv6 prefixes. Since the terminal device obtains multiple IPv6 addresses, when the terminal device sends out an IPv6 message, it needs to select an appropriate IPv6 address as the source IP address; otherwise, in some networks based on source address authentication/filtering, the terminal device sends The IPv6 packets will be discarded, so that the terminal device cannot use the services provided by the network. RFC3484 proposes an IPv6 default address selection method, which involves a default address selection algorithm and a default address selection policy table. When a terminal device sends a packet, the default algorithm cannot guarantee that the terminal device can select the correct source IPv6 address. Therefore, IETF upgrades this RFC and replaces RFC3484 with RFC6724. However, RFC6724 does not define the mechanism for configuring the address selection policy table. The Draft-ietf-6man-addr-select-opt document proposes how to implement the configuration and update of the address selection policy table when DHCPv6 is used, but does not give suggestions on the configuration of the address selection policy table when SLAAC is used.

Contents of the invention

In view of this, the embodiments of the present invention provide a method and device for configuring an IP address, which are used to solve the problem in the prior art that the address selection policy table cannot be configured when the SLAAC method is adopted.

In the first aspect, a method for configuring an IP address is provided, including: receiving a router request RS message sent by a terminal device; sending a first router advertisement RA message to the terminal device, and the first RA message is used to respond to the RS The message carries the first IPv6 prefix and the first accessible network segment corresponding to the first IPv6 prefix.

According to the first aspect, a first implementation manner is provided, the first RA message includes a prefix information option, the prefix information option includes the first IPv6 prefix and sub-options, and the sub-options include the first IPv6 prefix access network segment.

According to the first aspect, a second implementation manner is provided, the first RA message includes a prefix information option and a prefix description option corresponding to the prefix information option, and the prefix information option includes the first IPv6 prefix, so The prefix description option includes the first accessible network segment.

According to the first aspect or the first implementation of the first aspect or the second implementation of the first aspect, a third implementation is provided, the first RA message further includes the Internet address corresponding to the first IPv6 prefix ISP ID of the service provider.

According to the first aspect or the first implementation of the first aspect or the second implementation of the first aspect or the third implementation of the first aspect, a fourth implementation is provided, the method further includes: The terminal device sends a second RA message, where the second RA message carries a second IPv6 prefix and a second accessible network segment corresponding to the second IPv6 prefix.

In a second aspect, a method for configuring an IP address is provided, including: receiving a router request RS message sent by a terminal device; sending a router advertisement RA message to the terminal device, the RA message is used to respond to the RS message, and carries An IPv6 prefix and an ISP identifier corresponding to the IPv6 prefix.

According to the second aspect, a first implementation manner is provided, the RA message includes a prefix information option, the prefix information option includes the IPv6 prefix and a sub-option, and the sub-option includes the ISP identifier.

According to the second aspect, a second implementation is provided, the RA message includes a prefix information option and a prefix description option corresponding to the prefix information option, the prefix information option includes the IPv6 prefix, and the prefix description option Include the ISP ID.

In a third aspect, a network device is provided, including a receiving unit and a sending unit. Wherein, the receiving unit is configured to receive a router request RS message sent by a terminal device. The sending unit is configured to send a first router advertisement RA message, the first RA message is used to respond to the RS message, and carries a first IPv6 prefix and a first accessible network segment corresponding to the first IPv6 prefix.

According to the third aspect, a first implementation manner is provided, the first RA message includes a prefix information option, the prefix information option includes the first IPv6 prefix and sub-options, and the sub-options include the first IPv6 prefix access network segment.

According to the third aspect, a second implementation manner is provided, the first RA message includes a prefix information option and a prefix description option corresponding to the prefix information option, and the prefix information option includes the first IPv6 prefix, so The prefix description option includes the first accessible network segment.

According to the third aspect or the first implementation of the third aspect or the second implementation of the third aspect, a third implementation is provided, the first RA message further includes the Internet address corresponding to the first IPv6 prefix ISP ID of the service provider.

According to the third aspect or any of the above-mentioned implementation manners of the third aspect, a fourth implementation manner is provided, the sending unit is further configured to send a second RA message to the terminal device, and the second RA message carries the second The IPv6 prefix and the second accessible network segment corresponding to the second IPv6 prefix.

In a fourth aspect, a terminal device is provided, including: a sending unit, a receiving unit, and a processing unit. Wherein, the sending unit is used for sending a router request RS message. The receiving unit is configured to receive a first router advertisement RA message, the first RA message is used to respond to the RS message, and carries a first IPv6 prefix and a first accessible network segment corresponding to the first IPv6 prefix. The processing unit is configured to generate a first IPv6 address according to the first IPv6 prefix, and configure a first address selection policy table according to the first RA message, the first address selection policy table including the first IPv6 address The first accessible network segment corresponding to the first IPv6 address, where the first accessible network segment is used to identify a network segment that the terminal device can access when using the first IPv6 address as a source address.

According to the fourth aspect, a first implementation manner is provided, the first RA message includes a prefix information option, the prefix information option includes the first IPv6 prefix and sub-options, and the sub-options include the first IPv6 prefix. access network segment.

According to the fourth aspect, a second implementation manner is provided, the first RA message includes a prefix information option and a prefix description option corresponding to the prefix information option, and the prefix information option includes the first IPv6 prefix, so The prefix description option includes the first accessible network segment.

According to the fourth aspect or any implementation manner of the fourth aspect, the receiving unit is further configured to receive a second RA message, where the second RA message carries a second IPv6 prefix and a second IPv6 prefix corresponding to the second IPv6 prefix. Accessible network segment. The processing unit is further configured to generate a second IPv6 address according to the second IPv6 prefix, and configure a second address selection strategy table according to the second RA message, and the second address selection strategy table includes the second IPv6 address address and the second accessible network segment corresponding to the second IPv6 address, the second accessible network segment is used to identify a network segment that can be accessed when the terminal device uses the second IPv6 address as a source address .

Using the provided technical solution, the RA message received by the terminal device carries the IPv6 prefix and the accessible network segment corresponding to the IPv6 prefix, and the terminal device can configure an address selection policy table according to the RA message, and the address selection policy table includes IPv6 address An accessible network segment corresponding to the IPv6 address. When the terminal device communicates with other devices, it can select an appropriate IPv6 address as the source address according to the address selection policy table. Therefore, the solution of the embodiment of the present invention can realize the automatic configuration of the address selection policy table in the SLAAC mode.

According to a fifth aspect, a terminal device is provided, including: a sending unit, a receiving unit, and a processing unit. Wherein, the sending unit is used for sending a router request RS message. The receiving unit is configured to receive an RA message, the RA message is used for responding to the RS message, and carries a first IPv6 prefix and an identifier of a first Internet service provider (ISP) corresponding to the first IPv6 prefix. The processing unit is configured to determine a third IPv6 prefix corresponding to the ISP identifier preset by the terminal device from the first IPv6 prefix, and use the third IPv6 prefix to generate a first IPv6 address.

According to the fifth aspect, a first implementation manner is provided, the RA message includes a prefix information option, the prefix information option includes the first IPv6 prefix and a sub-option, and the sub-option includes the first ISP identifier.

According to the fifth aspect, a second implementation manner is provided, the RA message includes a prefix information option and a prefix description option corresponding to the prefix information option, the prefix information option includes the first IPv6 prefix, and the prefix The description option includes the first ISP identifier.

Using the provided technical solution, the RA message received by the terminal device carries the IPv6 prefix and the ISP identifier corresponding to the IPv6 prefix, and the terminal device can carry the IPv6 prefix from the RA message according to the locally preset ISP identifier and the RA message. Among the IPv6 prefixes, select the IPv6 prefix corresponding to the preset ISP identifier to generate an IPv6 address. Therefore, the solutions in the embodiments of the present invention can save IPv6 addresses.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the following drawings are only drawings of some embodiments of the present invention. For those of ordinary skill in the art That is to say, on the premise of not paying creative labor, other drawings that can also realize the technical solution of the present invention can also be obtained according to these drawings.

Fig. 1 is a simplified schematic diagram of a network structure in an embodiment of the present invention;

FIG. 2 is a schematic diagram of signaling interaction in bridge mode in an embodiment of the present invention;

FIG. 3 is a schematic diagram of signaling interaction in routing mode in an embodiment of the present invention;

Fig. 4 is the flow chart of the method for configuring IP address in one embodiment of the present invention;

Figure 5 is a RA message format diagram;

Figure 6 is a format diagram of the prefix information option in the RA message;

FIG. 7 is a format diagram of prefix informationoption including sub-option in an embodiment of the present invention;

FIG. 8 is a format diagram of an RA message including a newly added prefix description option in an embodiment of the present invention;

FIG. 9 is a format diagram of a prefix description option in a network according to an embodiment of the present invention;

Fig. 10 is a flowchart of a method for configuring an IP address in one embodiment of the present invention;

Fig. 11 is a flowchart of a method for configuring an IP address in another embodiment of the present invention;

FIG. 12 is a simplified schematic diagram of a network device in an embodiment of the present invention;

Fig. 13 is a simplified structural schematic diagram of a terminal device in an embodiment of the present invention;

Fig. 14 is a simplified structural schematic diagram of a terminal device in an embodiment of the present invention;

Fig. 15 is a simplified structural diagram of a network device in an embodiment of the present invention;

Fig. 16 is a simplified structural schematic diagram of a terminal device in an embodiment of the present invention;

Fig. 17 is a schematic diagram of a simplified structure of a terminal device in an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Apparently, each of the following embodiments is only a part of the present invention. Based on the following embodiments of the present invention, even if those skilled in the art do not make creative work, they can obtain other technical features that can solve the technical problems of the present invention and realize the technical effects of the present invention by equivalently transforming some or even all of the technical features. Embodiments, and these transformed embodiments obviously do not depart from the disclosed scope of the present invention.

FIG. 1 is a simplified schematic diagram of a network structure in an embodiment of the present invention. As shown in FIG. 1 , a terminal device 102 implements communication through a CE 104 , an access point (Access Node) 106 and a broadband remote access server (broadband remote access server, BRAS for short) 108 . For example, the terminal device 102 may be a computer, an IP television (IPTV), a telephone, a medical terminal, or other terminal devices. FIG. 1 exemplarily shows three terminal devices, but this embodiment of the present invention does not limit the number and types of terminal devices. In this embodiment, the arrangement mode of the CE is not limited either, for example, the CE may be arranged in a bridge mode or a routing mode.

Fig. 2 is a schematic diagram of signaling interaction in bridge mode in an embodiment of the present invention. As shown in FIG. 2 , when the deployment mode of the CE is the bridge mode, signaling interaction is performed between the terminal device 102 and the BRAS 108 to configure an IPv6 address.

202. The terminal device 102 sends a router solicitation message (Router Solicitation Message, RS Message for short) to the BRAS 108. For example, when the interface is enabled (enabled), the terminal device sends an RS message to request the router to generate a router advertisement message (Router Advertisement message, RA message for short).

204. The BRAS 108 sends a first RA message to the terminal device 102 to respond to the RS message, where the first RA message carries the first IPv6 prefix. There may be one or more first IPv6 prefixes.

In an implementation manner, in addition to carrying the first IPv6 prefix, the first RA message also carries a first accessible network segment corresponding to the first IPv6 prefix.

In another implementation manner, in addition to carrying the first IPv6 prefix, the first RA message also carries a first ISP identifier corresponding to the first IPv6 prefix.

In another implementation manner, in addition to carrying the first IPv6 prefix, the first RA message not only carries the first accessible network segment corresponding to the first IPv6 prefix, but also carries the first IPv6 prefix The corresponding first ISP ID.

206. The terminal device 102 generates a first IPv6 address according to the first IPv6 prefix carried in the first RA message.

In the case that the first RA message carries the first accessible network segment corresponding to the first IPv6 prefix, the terminal device 102 may also configure a first address selection policy table according to the first RA message, the The first address selection policy table includes the first IPv6 address and the first accessible network segment corresponding to the first IPv6 address. For example, the first RA message carries the first IPv6 prefix 1 and the corresponding first accessible network segment 1, the first IPv6 prefix 2 and the corresponding first accessible network segment 2, and the first IPv6 prefix 3 and the corresponding The first accessible network segment 3. The terminal device 102 receives the first RA message, generates a first IPv6 address 1 according to the first IPv6 prefix 1, generates a first IPv6 address 2 according to the first IPv6 prefix 2, and generates a first IPv6 address 2 according to the first IPv6 prefix 3 Generate a first IPv6 address 3 . The terminal device 102 is also configured with a first address selection policy table, the first address selection policy table including the first IPv6 address 1 and the corresponding accessible network segment 1, the first IPv6 address 2 and the corresponding accessible network segment 2, and The first IPv6 address 3 and the corresponding accessible network segment 3 . With this solution, the automatic configuration of the address selection policy table can be realized when the SLAAC mode is adopted.

When the terminal device 102 presets the third ISP identifier, the implementation manner of the above step 206 is as follows. In the case that the RA message carries the ISP identifier corresponding to the IPv6 prefix, the terminal device 102 may determine the third ISP identifier corresponding to the third ISP identifier from the first IPv6 prefix according to the third ISP identifier. Three IPv6 prefixes, generating the first IPv6 address according to the third IPv6 prefix as the IPv6 address of the terminal device 102 . If the third ISP identifier does not exist in the ISP identifier corresponding to the first IPv6 prefix, the operation of generating the IPv6 address according to the first RA message is omitted, that is, the IPv6 address is not generated according to the first RA message. For example, the third ISP is identified as one. With this solution, when the terminal device 102 only needs one IPv6 address, even if the terminal device 102 receives multiple IPv6 prefixes, it can generate an IPv6 address according to a locally preset ISP identifier and the received RA message, thereby Address waste can be avoided, and the trouble of selecting a source address is also saved when sending a message.

In the case where the first RA message carries the first accessible network segment corresponding to the first IPv6 prefix and the first ISP identifier, the terminal device 102 receives the first RA message, if the terminal device 102 locally presets a third ISP identifier, then select a third IPv6 prefix corresponding to the third ISP identifier from the first IPv6 prefix carried in the first RA message, and generate the first IPv6 address according to the third IPv6 prefix . If the third ISP identifier does not exist in the ISP identifier corresponding to the first IPv6 prefix, the operation of generating the IPv6 address according to the first RA message is omitted. If the terminal device 102 does not have a preset ISP identifier locally, the first IPv6 address may be generated according to the first RA message, and a first address selection policy table may be configured.

Optionally, the embodiment described in FIG. 2 may also include

208. The BRAS 108 sends a second RA message. The second RA message carries a second IPv6 prefix. The second IPv6 prefix can be one or more. The second IPv6 prefix may be the same as or different from the first IPv6 prefix, for example, one or more of the plurality of second IPv6 prefixes may be the same as one or more of the first IPv6 prefix same. For example, the second RA message may be sent periodically.

210. The terminal device 102 generates a second IPv6 address according to the second RA message.

For example, the second RA message may also carry a second accessible network segment corresponding to the second IPv6 prefix, and the terminal device 102 may generate a second IPv6 address according to the second RA message, and configure the second IPv6 address. An address selection strategy table, the second address selection strategy table includes the second IPv6 address and the second accessible network segment corresponding to the second IPv6 address.

For another example, the second RA message may also carry a second ISP identifier corresponding to the second IPv6 prefix, and if the terminal device 102 locally presets a third ISP identifier, the terminal device 102 may The second RA message is to determine the fourth IPv6 prefix corresponding to the third ISP identifier from the second IPv6 prefix, and generate the second IPv6 address according to the fourth IPv6 prefix as the IPv6 address of the terminal device 102 address. If the third ISP identifier does not exist in the ISP identifier corresponding to the second IPv6 prefix, the operation of generating the IPv6 address according to the second RA message is omitted.

For another example, in addition to carrying the second IPv6 prefix, the second RA message not only carries the second accessible network segment corresponding to the second IPv6 prefix, but also carries the second accessible network segment corresponding to the second IPv6 prefix. ISP identification. The terminal device 102 receives the second RA message, and if the terminal device 102 locally presets a third ISP identifier, the third ISP identifier may be determined from the second IPv6 prefix according to the second RA message A corresponding fourth IPv6 prefix, generating a second IPv6 address according to the fourth IPv6 prefix. If the third ISP identifier does not exist in the ISP identifier corresponding to the second IPv6 prefix, the operation of generating the IPv6 address according to the second RA message is omitted. If the terminal device 102 does not have a preset ISP identifier locally, a second IPv6 address may be generated according to the second RA message, and a second address selection policy table may be configured.

Fig. 3 is a schematic diagram of signaling interaction of routing mode in an embodiment of the present invention. As shown in FIG. 3 , when the deployment mode of the CE is the routing mode, signaling interaction is performed between the terminal device 102 and the CE 104 to configure an IPv6 address. 302. The terminal device 102 sends an RS message to the CE 104. For example, when the interface is enabled (enabled), the terminal device sends an RS message to request the router to generate a first RA message. 304. The CE 104 sends the first RA message to the terminal device 102 to respond to the RS message, and the first RA message carries the first IPv6 prefix. 306. The terminal device 102 generates a first IPv6 address according to the first RA message. Optionally, the embodiment described in FIG. 3 may further include 308. The CE 104 sends a second RA message. For example, the second RA message may be sent periodically. 310. The terminal device 102 generates a second IPv6 address according to the second RA message. The specific technical details of the embodiment shown in FIG. 3 are similar to those of the embodiment shown in FIG. 2 , and will not be repeated here.

Fig. 4 is a flowchart of a method for configuring an IP address in an embodiment of the present invention. As shown in FIG. 4 , 402 . Receive the RS message sent by the terminal device 102 . 404. Send the first RA message to the terminal device 102, where the first RA message is used to respond to the RS message and carries a first IPv6 prefix. Optionally, the embodiment described in FIG. 4 may further include 406. Sending a second RA message to the terminal device 102, where the second RA message carries a second IPv6 prefix. Optionally, the second RA message may be sent periodically. Implementation details of the embodiment shown in FIG. 4 are similar to those of the embodiments shown in FIGS. 2 and 3 , and will not be repeated here. If the subject of execution of the method shown in FIG. 4 is CE 104, then CE 104 obtains information corresponding to the IPv6 prefix from BRAS 108, and the information corresponding to the IPv6 prefix can be at least one of the following information: ISP identifier, accessible network segment . For example, the CE 104 can obtain the information corresponding to the IPv6 prefix from the BRAS 108 by using the RS and RA signaling interaction scheme in the SLAAC mode, or using the signaling interaction scheme defined by Draft-ietf-6man-addr-select-opt, There is no limitation in this embodiment.

RFC4861 defines the format of the RS message and the format of the RA message. For example, the RS message in the foregoing embodiment may adopt the format defined in RFC4861, which will not be repeated here. For the RA message defined by RFC4861, please refer to Figure 5. For the definition of the fields shown in Figure 5, please refer to RFC4861. RFC4861 also defines the prefix information option (prefix information option) in the RA message, the prefix information option can be one or more, see Figure 6, where the type (Type) field is 3, the length (Length) field is 4, other fields For the definition of , please refer to RFC4861. RFC4861 defines the prefixinformation option, so I won't go into details here. The RA message in the embodiment of the present invention carries the IPv6 prefix and the accessible network segment corresponding to the IPv6 prefix; or carries the IPv6 prefix and the ISP identifier corresponding to the IPv6 prefix; or carries the IPv6 prefix and the accessible network segment corresponding to the IPv6 prefix; The network segment and the ISP identifier corresponding to the IPv6 prefix.

For example, a sub-option (sub-option) can be added to the prefixinformation option of the RA message for stateless address autoconfiguration to indicate which ISP the IPv6 prefix in the prefixinformation option belongs to (referred to elsewhere in the text as "IPv6 prefix corresponding ISP identifier"), and/or, which network segment is accessed by the terminal device using the IPv6 address generated by the IPv6 prefix as the source IP address (hereinafter referred to as "the accessible network segment corresponding to the IPv6 prefix"). FIG. 7 shows a format diagram of the prefix information option including the sub-option in an embodiment of the present invention. As shown in Figure 7, the length (Length) is no longer fixed at 4, but filled in according to the actual length of the option, and the last part of the prefix information option is a variable-length sub-option. The sub-option field is at least one of the following information: ISP identifier, accessible network segment. On some IPv6 terminals with specific functions, only one IPv6 address is required. For this type of IPv6 terminals, the ISP can preset the ISP logo on the terminal or terminal software provided to the user. The terminal or terminal software with the preset ISP identifier, when generating its own IPv6 address according to the RA message, selects the matching prefix information option according to the preset ISP identifier, and uses the IPv6 prefix carried by the matching prefix information option to generate an IPv6 address. The accessible network segment shown in FIG. 7 indicates that when the terminal device accesses the network segment in the sub-option, the source IPv6 address used should be the IPv6 address generated according to the prefix in the prefixinformation option. When the terminal device receives the RA message, it can configure the address selection policy table defined in RFC6724 according to the accessible network segment. The configuration, addition, modification, and deletion of the address selection policy table can be performed according to the prefixinformation option and sub-option of the RA message. For example, when the RA message includes multiple prefixes, the RA message may include multiple prefix information options, and each prefix information option may adopt the format shown in FIG. 7 . When using this scheme, if a prefix information option of the RA message does not carry the sub-option, or the content of the sub-option is empty, or the content of the sub-option is a specific value, it means that the prefix information option in the IPv6 prefix is the default IPv6 prefix. The terminal device can generate a default IPv6 address according to the default IPv6 prefix. When the terminal device queries the address selection policy table according to the destination address to be accessed to determine the source IP address, if the accessible network segment in the address selection policy table does not include the destination address to be accessed, the terminal device uses the default IP address. The IPv6 address is used as the source IP address to access the destination address.

In another embodiment, a new option, such as a prefix description option (prefix description option), may be added to the RA message, following the prefix information option, as a supplementary description of the prefix information option. The prefix description option is used to describe the ISP corresponding to the IPv6 prefix in the prefix information option, and/or, the corresponding accessible network segment. FIG. 8 shows an RA message format diagram including a newly added prefix description option in an embodiment of the present invention, each prefix information option is followed by a corresponding prefix description option, and the Type of the prefix information option is 3. Fig. 9 shows a format diagram of a prefixdescription option in an embodiment of the present invention. As shown in Figure 9, the prefix description option includes type, length, reserved (reserved) and option data (option-data). Where type is a newly defined value, such as 10, or 20, or other values not defined in RFC4861. option-data includes option data corresponding to the prefix in the prefix information option, which may be at least one of the following information: ISP identifier, accessible network segment.

Fig. 10 is a flowchart of a method for configuring an IP address in an embodiment of the present invention. As shown in FIG. 10 , the method includes: 1002. The terminal device 102 sends an RS message. 1004. The terminal device 102 receives the first RA message. 1006. The terminal device 102 generates a first IPv6 address according to the first RA message, and configures a first address selection policy table.

Optionally, the method shown in FIG. 10 may further include: 1008. The terminal device 102 receives a second RA message. 1010. The terminal device 102 generates a second IPv6 address according to the second RA message, and configures a second address selection policy table.

Optionally, before 1006, the method shown in FIG. 10 may further include 1012. Determine whether the terminal device 102 presets an ISP identifier. If the ISP identity is not preset, execute the above step 1006. If the ISP identifier is preset, perform 1014. Generate a first IPv6 address according to the preset ISP identifier and the first RA message.

Fig. 11 is a flowchart of a method for configuring an IP address in another embodiment of the present invention. As shown in FIG. 11 , 1102 . The terminal device 102 sends an RS message. 1104. The terminal device 102 receives the first RA message. 1106. The terminal device 102 judges whether the local ISP logo is preset, and if it is determined that the local ISP logo is preset, then execute 1108. 1108. The terminal device 102 according to the preset ISP logo and the first RA message Generate a first IPv6 address. Optionally, the embodiment shown in FIG. 11 may further include 1110. The terminal device 102 receives a second RA message. 1112. The terminal device 102 generates a second IPv6 address according to the preset ISP identifier and the second RA message.

For specific implementation details of the methods shown in FIG. 10 and FIG. 11 , refer to the foregoing embodiments, and details are not repeated here.

Fig. 12 shows a simplified structural diagram of a network device 1200 in an embodiment of the present invention. The network device 1200 includes a receiving unit 1202 and a sending unit 1204 . The receiving unit 1202 is configured to receive the RS message sent by the terminal device. The sending unit 1204 is configured to send a first RA message, where the first RA message is used to respond to the RS message. Optionally, the sending unit 1204 is further configured to send a second RA message. The second RA message may be sent periodically. Optionally, the network device 1200 may further include a generating unit 1206, configured to generate the first RA message. Optionally, the generating unit 1206 may also be configured to generate the second RA message. The network device shown in FIG. 12 may be the BRAS 108 shown in FIG. 2 or the CE 104 shown in FIG. 3 . If the network device is the CE 104 shown in FIG. 3, the network device 1200 may further include a processing unit 1208, configured to obtain information corresponding to the IPv6 prefix from the BRAS 108 shown in FIG. 3, such as an accessible network segment, and/or, ISP identification. Correspondingly, the generating unit 1206 is configured to generate the first RA message and/or the second RA message according to the information corresponding to the IPv6 prefix obtained by the processing unit 1208 .

FIG. 13 shows a simplified structural diagram of a terminal device 1300 in an embodiment of the present invention. The terminal device 1300 includes a sending unit 1302 , a receiving unit 1304 and a processing unit 1306 . The sending unit 1302 is used for sending RS messages. The receiving unit 1304 is configured to receive a first RA message in response to the RS message. The processing unit 1306 is configured to generate a first IPv6 address according to the first RA message, and configure a first address selection policy table. Optionally, the receiving unit 1304 is also configured to receive a second RA message. The second RA message may be sent periodically. The processing unit 1306 may also be configured to generate a second IPv6 address according to the second RA message, and configure a second address selection policy table. Optionally, the processing unit 1306 is specifically configured to determine whether the terminal device 1300 presets an ISP identifier, and if the preset ISP identifier is preset, generate a first IPv6 address according to the preset ISP identifier and the first RA message. address; if no ISP identifier is preset, generate the first IPv6 address according to the first RA message, and configure the first address selection policy table. Optionally, the terminal device 1300 may further include a storage unit, configured to store the preset ISP identifier.

FIG. 14 shows a simplified structural diagram of a terminal device 1400 in an embodiment of the present invention. The terminal device 1400 includes a sending unit 1402 , a receiving unit 1404 and a processing unit 1406 . The sending unit 1402 is used for sending RS messages. The receiving unit 1404 is configured to receive a first RA message in response to the RS message. The processing unit 1406 is configured to determine whether the terminal device 1400 presets an ISP identifier, and if the preset ISP identifier is preset, generate a first IPv6 address according to the preset ISP identifier and the first RA message. Optionally, the receiving unit 1404 is also configured to receive a second RA message. The processing unit 1406 is further configured to generate a second IPv6 address according to the preset ISP identifier and the second RA message. Optionally, the terminal device 1400 may further include a storage unit, configured to store the preset ISP identifier.

In the embodiments shown in Figures 12, 13 and 14, the division of each unit is only an example, and in actual applications, the above-mentioned operations can be allocated by different units according to needs, such as the configuration requirements of corresponding hardware or the convenience of software implementation. The unit is completed to complete all or part of the functions described above. The implementation details of the embodiments shown in FIGS. 12-14 have been described in the previous embodiments, and will not be repeated here.

Fig. 15 shows a schematic diagram of a simplified structure of a network device in an embodiment of the present invention. As shown in FIG. 15 , a network device 1500 includes an input/output circuit (I/O circuit) 1502 , a processor (processor) 1504 and a memory (memory) 1506 . The input/output circuit 1502 is configured to receive an RS message sent by a terminal device, and send a first RA message, and the first RA message is used to respond to the RS message. Optionally, the input/output circuit 1502 is also configured to send a second RA message. The second RA message may be sent periodically. The processor 1504 is configured to generate the first RA message. Optionally, the processor 1504 is further configured to generate the second RA message. The memory 1506 is used to store program instructions, which, when executed, cause the processor 1504 to perform the above operations.

The network device shown in FIG. 15 may be the BRAS 108 shown in FIG. 2 or the CE 104 shown in FIG. 3 . If the network device is the CE 104 shown in FIG. 3, the processor 1504 is further configured to obtain information corresponding to the IPv6 prefix from the BRAS 108 shown in FIG. 3, such as an accessible network segment, and/or an ISP identifier .

Fig. 16 shows a schematic diagram of a simplified structure of a terminal device in an embodiment of the present invention. As shown in FIG. 16 , a terminal device 1600 includes an input/output circuit (I/O circuit) 1602 , a processor (processor) 1604 and a memory (memory) 1606 . The input/output circuit 1602 is configured to send an RS message and receive a first RA message in response to the RS message. The processor 1604 is configured to generate a first IPv6 address according to the RA message, and configure a first address selection policy table. Optionally, the input/output circuit 1602 is also configured to receive a second RA message. The second RA message may be sent periodically. The processor 1604 may also be configured to generate a second IPv6 address according to the second RA message, and configure a second address selection policy table. Optionally, the processor 1604 is specifically configured to determine whether the terminal device 1600 presets an ISP identifier, and if the preset ISP identifier is preset, generate a first IPv6 address according to the preset ISP identifier and the first RA message. address; if no ISP identifier is preset, generate the first IPv6 address according to the first RA message, and configure the first address selection policy table. The memory 1606 is used to store program instructions, which, when executed, cause the processor 1604 to perform the above operations. Optionally, the memory 1606 is also used to store the preset ISP identifier.

Fig. 17 shows a simplified structural diagram of a terminal device in an embodiment of the present invention. As shown in FIG. 17 , a terminal device 1700 includes an input/output circuit (I/O circuit) 1702 , a processor (processor) 1704 and a memory (memory) 1706 . The input/output circuit 1702 is used to send an RS message and receive a first RA message in response to the RS message. The processor 1704 is configured to determine whether the terminal device 1700 presets an ISP identifier, and if the preset ISP identifier is preset, generate a first IPv6 address according to the preset ISP identifier and the first RA message. Optionally, the input/output circuit 1702 is also configured to receive a second RA message. The processor 1704 is further configured to generate a second IPv6 address according to the preset ISP identifier and the second RA message. The memory 1706 is used to store program instructions, which, when executed, cause the processor 1704 to perform the above operations. Optionally, the memory 1706 is also used to store the preset ISP identifier.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the foregoing method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps comprising the above-mentioned method embodiments; and the aforementioned storage medium includes: read-only memory (read-only memory, ROM for short), random access memory (random access memory, RAM for short), magnetic Various media that can store program codes such as discs or optical discs.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technology of the embodiments of the present invention. scope of the program.

Claims (10)

1. A method for configuring an IP address, characterized in that, comprising: The terminal device sends a router request RS message to the network device; The terminal device receives the first router advertisement RA message sent by the network device, the first router advertisement RA message is used to respond to the RS message, and carries the first IPv6 prefix and the first IPv6 prefix corresponding to the first IPv6 prefix. 1. Accessible network segment; The terminal device generates a first IPv6 address according to the first IPv6 prefix, and configures a first address selection policy table according to the first router advertisement RA message, and the first address selection policy table includes the first IPv6 address The first accessible network segment corresponding to the first IPv6 address, where the first accessible network segment is used to identify a network segment that the terminal device can access when using the first IPv6 address as a source address. 2. The method according to claim 1, wherein the first router advertisement RA message includes a prefix information option, the prefix information option includes the first IPv6 prefix and sub-options, and the sub-options include The first accessible network segment. 3. The method according to claim 1, wherein the first router advertisement RA message includes a prefix information option and a prefix description option corresponding to the prefix information option, and the prefix information option includes the first An IPv6 prefix, the prefix description option includes the first accessible network segment. 4. The method according to any one of claims 1-3, wherein the first Router Advertisement RA message further includes an ISP identifier corresponding to the first IPv6 prefix. 5. The method according to any one of claims 1-3, further comprising: The terminal device receives a second router advertisement RA message sent by a network device, where the second router advertisement RA message carries a second IPv6 prefix and a second accessible network segment corresponding to the second IPv6 prefix; The terminal device generates a second IPv6 address according to the second IPv6 prefix, and configures a second address selection policy table according to the second router advertisement RA message, and the second address selection policy table includes the second IPv6 address The second accessible network segment corresponding to the second IPv6 address, where the second accessible network segment is used to identify a network segment that the terminal device can access when using the second IPv6 address as a source address. 6. The method according to claim 4, further comprising: The terminal device receives a second router advertisement RA message sent by a network device, where the second router advertisement RA message carries a second IPv6 prefix and a second accessible network segment corresponding to the second IPv6 prefix; The terminal device generates a second IPv6 address according to the second IPv6 prefix, and configures a second address selection policy table according to the second router advertisement RA message, and the second address selection policy table includes the second IPv6 address The second accessible network segment corresponding to the second IPv6 address, where the second accessible network segment is used to identify a network segment that the terminal device can access when using the second IPv6 address as a source address. 7. A terminal device, characterized in that it includes: a sending unit, a receiving unit, and a processing unit; wherein, The sending unit is used to send a router request RS message; The receiving unit is configured to receive a first router advertisement RA message, the first router advertisement RA message is used to respond to the RS message, and carries the first IPv6 prefix and the first accessible network corresponding to the first IPv6 prefix part; The processing unit is configured to generate a first IPv6 address according to the first IPv6 prefix, and configure a first address selection policy table according to the first router advertisement RA message, the first address selection policy table including the first An IPv6 address and the first accessible network segment corresponding to the first IPv6 address, where the first accessible network segment is used to identify a network that the terminal device can access when using the first IPv6 address as a source address part. 8. The device according to claim 7, wherein the first router advertisement RA message includes a prefix information option, the prefix information option includes the first IPv6 prefix and sub-options, and the sub-options include The first accessible network segment. 9. The device according to claim 7, wherein the first router advertisement RA message includes a prefix information option and a prefix description option corresponding to the prefix information option, and the prefix information option includes the first An IPv6 prefix, the prefix description option includes the first accessible network segment. 10. The device according to any one of claims 7-9, wherein the receiving unit is further configured to receive a second router advertisement RA message, the second router advertisement RA message carrying the second IPv6 prefix and the A second accessible network segment corresponding to the second IPv6 prefix; The processing unit is further configured to generate a second IPv6 address according to the second IPv6 prefix, and configure a second address selection policy table according to the second router advertisement RA message, the second address selection policy table including the first Two IPv6 addresses and the second accessible network segment corresponding to the second IPv6 address, the second accessible network segment is used to identify the terminal device that can access when using the second IPv6 address as the source address network segment.