CN101110817B - Method and system for address selection - Google Patents
Method and system for address selection Download PDFInfo
- Publication number
- CN101110817B CN101110817B CN2006101033629A CN200610103362A CN101110817B CN 101110817 B CN101110817 B CN 101110817B CN 2006101033629 A CN2006101033629 A CN 2006101033629A CN 200610103362 A CN200610103362 A CN 200610103362A CN 101110817 B CN101110817 B CN 101110817B
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- address
- prefix
- relay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/59—Network arrangements, protocols or services for addressing or naming using proxies for addressing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5007—Internet protocol [IP] addresses
- H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/618—Details of network addresses
- H04L2101/659—Internet protocol version 6 [IPv6] addresses
Abstract
The present invention provides a method and a system for address selection, which belongs to the network communication field. The present invention provides an address selection method in order to solve the problem that the possibility of selection is poor when addresses are selected through the DHCPv6 relay agent. The method comprises that prefix selection options are inserted in the Relay-forward message format of a relay agent, a Relay-forward message is built and transmitted to a server, and after receiving the Relay-forward message, the server allocates the addresses corresponding to the prefixes in the prefix selection options. The present invention also provides a system of the address selection, which comprises a client side, the relay agent and the server. By adopting the technical proposal of the present invention, the server is reminded to allocate the address belonging to a specific prefix for a client side, and are reminded to allocate a plurality of addresses belonging to the a plurality of specific prefixes for the client side.
Description
Technical field
The present invention relates to network communication field, particularly a kind of method and system of address choice.
Background technology
DHCPv6 (Dynamic Host Configuration Protocol for IPv6, the DHCP of IP version six) is the mechanism of a kind of dynamic assignment IPv6 address and configuration parameter.
DHCPv6 adopts customer end/server mode; By user end to server the configuration application is proposed; The application content comprises: parameters such as IP address allocated, subnet mask, default gateway; Server returns corresponding configuration information according to strategy, and the DHCPv6 message adopts UDP (User Datagram Protocol, UDP) to encapsulate.
Referring to Fig. 1, the DHCPv6 course of work is following:
1.DHCPv6 client is sought the DHCPv6 server: the DHCPv6 client is sent Solicit (request) message and is sought the DHCPv6 server;
2.DHCPv6 server provides IP the address: the DHCPv6 server that in network, receives Solicit message all can be made response; Select available address assignment to give the DHCPv6 client, send Advertise (notice) message that comprises IP address allocated and other configuration parameters to the DHCPv6 client;
3.DHCPv6 the IP address that client selects certain DHCPv6 server to provide: if there are a plurality of DHCPv6 servers to send Advertise message to the DHCPv6 client; Then the DHCPv6 client is selected one from the Advertise that receives, promptly selected DHCPv6 server.The DHCPv6 client comprises the IP address of the selected DHCPv6 server of DHCPv6 client and the IP address that this DHCPv6 server provides with Request (requirement) acknowledgement messaging in this message then.
4.DHCPv6 the IP address that the server affirmation is provided: receive the Request message of DHCPv6 client when the DHCPv6 server after; It just sends one to the DHCPv6 client and comprises the IP address that it provides and Reply (replying) message of other configuration parameters, tells the IP address that the DHCPv6 client can be used it to be provided.
DHCPv6 Relay Agent (DHCPv6 relay agent) is between DHCPv6 client and DHCPv6 server, and its effect is:
1. the Relay-forward message that the message of can relaying DHCPv6 client sending and other relay agents send; In the middle of subculture reason receive legal when needing the message of relaying; It can make up a new Relay-forward message; Insert a whole world or site-local address in the link-address field, the effect of this address be the prompting server this give which type of address of client.Source IP address with the packet of receiving fills in the peer-address field of Relay-forward message then; The DHCPv6 message of receiving (not comprising IP head and UDP head) is placed in the Relay message tab, adds some other option according to configuration in addition.
Referring to Fig. 2, the Relay-forward message format is:
Link-address: whole world or site-local address, server is confirmed client place link with this address;
Peer-address: the address (possibly be client or other relay agent) that last one of this message is jumped;
Options: must comprise " Relay Message Option ".
2. can relaying DHCPv6 server or the Relay-reply message sent of other relay agents, handle the Total Options except the Relay message tab in the Relay-reply message, after the processing they are abandoned.Then the content in the Relay message tab is extracted out, forward.
Referring to Fig. 3, the DHCPv6 client is following to the process of DHCPv6 server applied address through DHCPv6 relay agent:
1.DHCPv6 client is sent the request of applied address to DHCPv6 relay agent.
2.DHCPv6 relay agent receives after the request from the DHCPv6 client, sets up Relay-forward message, and sends to the DHCPv6 server, the value of link-address is IP_Y in this message;
3.DHCPv6 after server receives the Relay-forward message from DHCPv6 relay agent, distribute the address for the DHCPv6 client according to the link-address in the message, and this address sent to DHCPv6 relay agent;
The Relay-forward message of this moment is as follows:
msg-type：RELAY-FORW；
hop-count：0；
link-address：IP_Y；
The address of peer-address:DHCPv6 client;
Relay Message option: < request of DHCPv6 Client >.
4.DHCPv6 relay agent is transmitted to the DHCPv6 client after receiving the address of DHCPv6 server transmission.
Referring to Fig. 4, suppose that the corresponding prefix of ISP_1 is prefix_1, the prefix that ISP_2 is corresponding is prefix_2; The prefix that ISP_3 is corresponding is prefix_3, and client (Host) hopes to obtain to belong to ISP_1, ISP_2; The address of ISP_3, but this client is not known concrete prefix, in this case; If point out DHCPv6 server according to link-address (being interface IP_Y), DHCPv6 server (DHCPv6 Server) can only distribute an address relevant with interface IP_Y to the client, can not provide to belong to ISP_1; ISP_2, the address of ISP_3.
The shortcoming of prior art:
DHCPv6 relay agent can not point out the DHCPv6 server for the client address with particular prefix to be provided, can only distribute one with middle DHCPv6 subculture reason relevant address, address, client's washability when applied address is poor.
Summary of the invention
The problem that the objective of the invention is to overcome in the prior art washability difference when carrying out address choice through DHCPv6 relay agent provides a kind of method and system of address choice.Said technical scheme is following:
The invention provides a kind of method of address choice, said method comprising the steps of:
Steps A: client is sent address request;
Step B: relay agent confirms prefix list according to selection strategy after receiving said address request, and sends to server to said prefix list;
Step C: after said server is received said prefix list, confirm said prefix list corresponding address, and send to relay agent to said prefix list corresponding address according to address allocation policy;
Step D: said relay agent is transmitted to client with the prefix list corresponding address after receiving said prefix list corresponding address.
Selection strategy among the said step B comprises one of following strategy at least:
Carry out the selection of prefix according to the position of client;
Carry out the selection of prefix according to the information in the said address request;
Carry out the selection of prefix according to the current configuration of relay agent.
Address allocation policy among the said step C comprises one of following strategy at least:
Carry out the distribution of address according to the prefix list that obtains;
Carry out the distribution of address according to the information in prefix list and the address request.
Said method step B specifically comprises:
Relay agent confirms prefix list according to selection strategy after receiving said address request, and in Relay-forward message, sends to server to said prefix list establishment.
Setting up said prefix list among the said step B is specially in Relay-forward message:
In the Relay-forward of relay agent message format, insert prefix and select option, and deposit prefix list in the prefix selection option in.
Said method step C specifically comprises:
After said server is received said Relay-forward message; Select to obtain prefix list the option from prefix; Obtain address request simultaneously; Distribute said prefix list corresponding address for said client according to address allocation policy, said prefix list corresponding address establishment in the response message of Relay-reply message and send to relay agent.
Said method step D specifically comprises:
Said relay agent extracts the response message of server from said Relay-reply message, then said response message is sent to said client.
Client in the said method is the DHCPv6 client, and said relay agent is a DHCPv6 relay agent, and said server is the DHCPv6 server.
The present invention also provides a kind of system of address choice, and said system comprises client, relay agent, server;
Said client is used to send address request and reception server addresses distributed;
Said relay agent is used to receive the request message that said client is sent, and confirms prefix list according to selection strategy, and sends to server to said prefix list, and said relay agent also is used for the prefix list corresponding address that reception server sends simultaneously;
Said server is used to receive the prefix list message that said relay agent sends, and distributes said prefix list corresponding address according to address allocation policy, and the prefix list corresponding address is sent to relay agent.
Said relay agent comprises the selection strategy module, and said selection strategy module is that said relay agent provides the strategy that carries out the selection of prefix, carries out the selection of prefix or carry out the selection of prefix according to the current configuration of relay agent according to the information in the said address request according to the position of client.
Said relay agent comprises the Relay-forward message module;
Said Relay-forward message module is used to deposit address request and the prefix list that client is sent.
Said server specifically comprises Relay-reply message module and address allocation policy module;
Said Relay-reply message module is used to deposit and has said prefix list corresponding address;
Said address allocation policy module is that said server provides the strategy that carries out the distribution of address or carry out the distribution of address according to the information in prefix list and the address request according to the prefix list that obtains.
Client in the said system is the DHCPv6 client, and said relay agent is a DHCPv6 relay agent, and said server is the DHCPv6 server.
The beneficial effect that technical scheme of the present invention is brought is:
Select option through send to the prefix of inserting in the message of server in relay agent, can point out server to distribute the address that belongs to particular prefix, also can point out server to distribute a plurality of addresses that belong to a plurality of particular prefixs to client to client.
Description of drawings
Fig. 1 is a DHCPv6 course of work sketch map in the prior art;
Fig. 2 is the Relay-forward message format sketch map of DHCPv6 relay agent in the prior art;
Fig. 3 is that the DHCPv6 client is carried out address choice process sketch map through DHCPv6 relay agent in the prior art;
Fig. 4 is the sketch map that carries out address choice in the prior art through DHCPv6 relay agent;
Fig. 5 is the embodiment of the invention 1 a said method flow diagram;
Fig. 6 is that prefix is selected the choice format sketch map in the embodiment of the invention 1;
Fig. 7 is that prefix is selected concrete prefix form sketch map in the option in the embodiment of the invention 1;
Fig. 8 is the embodiment of the invention 2 said system schematic.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further, but not as to qualification of the present invention.
The present invention be that example describes to be applied in that IPv6 goes up, and in the Relay-forward message of original DHCPv6 relay agent, inserts prefix selection option, can point out the DHCPv6 server to carry out address assignment according to this option like this.
Referring to Fig. 5, a kind of method of address choice, the client in this method are the DHCPv6 client, and relay agent is a DHCPv6 relay agent, and server is the DHCPv6 server.
At first, in the Relay-forward of DHCPv6 relay agent message format, insert prefix and select option (Relay Prefix Selection Option), this prefix selects choice format referring to Fig. 6,
OPTION_RELAY_PS: relays prefix is selected option;
Option-len: the length of option;
PS-Prefix option 1, PS-Prefix option 2 ...: prefix list;
Wherein, PS-Prefix option option is used for describing relays prefix and selects each concrete prefix of option, and concrete form is referring to Fig. 7,
OPTION_PSPREFIX: prefix option;
Prefix-length: prefix length;
The IPv6-prefix:IPv6 prefix;
Related options: other options relevant with this prefix.
The method of the invention specifically may further comprise the steps:
Step 101:DHCPv6 client is sent address request with the multicast mode.
Step 102: after said DHCPv6 relay agent receives above-mentioned address request, confirm prefix list, and deposit prefix list in prefix and select in the option that said selection strategy is at least one of following strategy according to selection strategy:
1) carries out the selection of prefix according to the position of DHCPv6 client;
2) carry out the selection of prefix according to the information in the address request, the information in the address request here refers to the hardware address of client, NAI, client identifier etc.;
3) carry out the selection of prefix according to the current configuration of DHCPv6 relay agent;
Deng.
Present embodiment DHCPv6 relay agent adopts 3) carry out the selection of prefix according to the current configuration of DHCPv6 relay agent, and generate prefix list: (prefix _ 1, prefix _ 2 ...), and deposit this prefix list in prefix and select in the option.
Relay-forward message is set up in step 103:DHCPv6 relay agent, and sends to the DHCPv6 server to Relay-forward message, and wherein Relay-forward message is:
Msg-type: the type of message, be Relay-forw this moment;
Hop-count: the transfer number of times that message experiences from this node to destination node midway, be 0 this moment;
Link-address: whole world or site-local address, server is confirmed client place link with this address, be IP_Y this moment;
Peer-address: the address (possibly be client or other relay agent) that last one of this message is jumped, be client address this moment;
Relay Message Option: (request of DHCPv6 client), wherein " Relay Message Option " is the essential option in the Options option;
Prefix is selected option: (prefix _ 1, prefix _ 2 ...).
After step 104:DHCPv6 server receives above-mentioned Relay-forward message; Select to obtain prefix list the option from prefix; From Relay Message Option option, obtain address request; According to address allocation policy, distribute said prefix list corresponding address for the DHCPv6 client then.
Above-mentioned address allocation policy is at least one of following strategy:
1) carries out the distribution of address according to the prefix list that obtains;
2) carry out the distribution of address according to the information in prefix list and the address request.
Deng.
Present embodiment adopts 2) carry out the distribution of address according to the information in prefix list and the address request; After address allocation policy was confirmed, to prefix corresponding address in client's distribution and the prefix list, addresses distributed was address ip _ 1 with prefix _ 1; Address ip _ 2 with prefix _ 2 ...
After step 105:DHCPv6 server is selected said prefix list corresponding address; Set up said prefix list corresponding address in Relay-reply message; And Relay-reply message sent to DHCPv6 relay agent; Be the response message of DHCPv6 server in the Relay Message Option option of Relay-reply message wherein, in this response message, comprised the prefix list corresponding address that the DHCPv6 server distributes for the DHCPv6 client the DHCPv6 client.
After the Relay-reply message of DHCPv6 server transmission is received by step 106:DHCPv6 relay agent; From Relay Message Option option, extract the response message of DHCPv6 server, and this response message is sent to the DHCPv6 client the DHCPv6 client.
After step 107:DHCPv6 client is received said response message, from said response message, obtain addresses distributed, this address is address ip _ 1 with prefix _ 1, has address ip _ 2 of prefix _ 2 ...
Referring to Fig. 8, the present invention also provides a kind of system of address choice, and this system comprises client, relay agent, server;
Wherein, client is used to send address request and reception server addresses distributed;
Relay agent is used to receive the request message that said client is sent, and confirms prefix list according to selection strategy, and sends to server to said prefix list, and what said relay agent also was used for the reception server transmission simultaneously has a prefix list corresponding address;
Server is used to receive the prefix list message that said relay agent sends, and distributes said prefix list corresponding address according to address allocation policy, and the prefix list corresponding address is sent to relay agent.
Relay agent specifically comprises Relay-forward message module and selection strategy module;
Wherein, the Relay-forward message module is used to deposit address request and the prefix list that client is sent;
The selection strategy module is that said relay agent provides the strategy that carries out the selection of prefix, carries out the selection of prefix or carry out the selection of prefix according to the current configuration of relay agent according to the information in the said address request according to the position of client.
Server specifically comprises Relay-reply message module and address allocation policy module;
Wherein, the Relay-reply message module is used to deposit and has said prefix list corresponding address;
The address allocation policy module is that said server provides the strategy that carries out the distribution of address or carry out the distribution of address according to the information in prefix list and the address request according to the prefix list that obtains.
Client in this system is the DHCPv6 client, and said relay agent is a DHCPv6 relay agent, and said server is the DHCPv6 server.
Above-described embodiment, the present invention embodiment a kind of more preferably just, common variation that those skilled in the art carries out in technical scheme scope of the present invention and replacement all should be included in protection scope of the present invention.
Claims (11)
1. the method for an address choice is characterized in that, said method comprising the steps of:
Steps A: client is sent address request;
Step B: relay agent confirms prefix list according to selection strategy after receiving said address request, and sends to server to said prefix list;
Step C: after said server is received said prefix list, confirm said prefix list corresponding address, and send to relay agent to said prefix list corresponding address according to address allocation policy;
Step D: said relay agent is transmitted to client with the prefix list corresponding address after receiving said prefix list corresponding address;
Selection strategy among the said step B comprises one of following strategy at least:
Carry out the selection of prefix according to the position of client;
Carry out the selection of prefix according to the information in the said address request;
Carry out the selection of prefix according to the current configuration of relay agent.
2. the method for address choice as claimed in claim 1 is characterized in that, the address allocation policy among the said step C comprises one of following strategy at least:
Carry out the distribution of address according to the prefix list that obtains;
Carry out the distribution of address according to the information in prefix list and the address request.
3. the method for address choice as claimed in claim 1 is characterized in that, said method step B specifically comprises:
Relay agent confirms prefix list according to selection strategy after receiving said address request, and in Relay-forward message, sends to server to said prefix list establishment.
4. the method for address choice as claimed in claim 3 is characterized in that, setting up said prefix list among the said step B is specially in Relay-forward message:
In the Relay-forward of relay agent message format, insert prefix and select option, and deposit prefix list in the prefix selection option in.
5. the method for address choice as claimed in claim 4 is characterized in that, said method step C specifically comprises:
After said server is received said Relay-forward message; Select to obtain prefix list the option from prefix; Obtain address request simultaneously; Distribute said prefix list corresponding address for said client according to address allocation policy, said prefix list corresponding address establishment in the response message of Relay-reply message and send to relay agent.
6. the method for address choice as claimed in claim 5 is characterized in that, said method step D specifically comprises:
Said relay agent extracts the response message of server from said Relay-reply message, then said response message is sent to said client.
7. like the method for each described address choice of claim 1 to 6, it is characterized in that described client is the DHCPv6 client, said relay agent is a DHCPv6 relay agent, and said server is the DHCPv6 server.
8. the system of an address choice is characterized in that, said system comprises client, relay agent, server;
Said client is used to send address request and reception server addresses distributed;
Said relay agent is used to receive the request message that said client is sent, and confirms prefix list according to selection strategy, and sends to server to said prefix list, and said relay agent also is used for the prefix list corresponding address that reception server sends simultaneously;
Said server is used to receive the prefix list message that said relay agent sends, and distributes said prefix list corresponding address according to address allocation policy, and the prefix list corresponding address is sent to relay agent;
Said relay agent comprises the selection strategy module, and said selection strategy module is that said relay agent provides the strategy that carries out the selection of prefix, carries out the selection of prefix or carry out the selection of prefix according to the current configuration of relay agent according to the information in the said address request according to the position of client.
9. the system of address choice as claimed in claim 8 is characterized in that, said relay agent comprises the Relay-forward message module;
Said Relay-forward message module is used to deposit address request and the prefix list that client is sent.
10. the system of address choice as claimed in claim 8 is characterized in that, said server specifically comprises Relay-reply message module and address allocation policy module;
Said Relay-reply message module is used to deposit said prefix list corresponding address;
Said address allocation policy module is that said server provides the strategy that carries out the distribution of address or carry out the distribution of address according to the information in prefix list and the address request according to the prefix list that obtains.
11. the system like each described address choice of claim 8 to 10 is characterized in that, described client is the DHCPv6 client, and said relay agent is a DHCPv6 relay agent, and said server is the DHCPv6 server.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101033629A CN101110817B (en) | 2006-07-21 | 2006-07-21 | Method and system for address selection |
| PCT/CN2007/001128 WO2008011776A1 (en) | 2006-07-21 | 2007-04-09 | An address assignment realizing method and the system, the relay agent, the server thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101033629A CN101110817B (en) | 2006-07-21 | 2006-07-21 | Method and system for address selection |
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| Publication Number | Publication Date |
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| CN101110817A CN101110817A (en) | 2008-01-23 |
| CN101110817B true CN101110817B (en) | 2012-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006101033629A Expired - Fee Related CN101110817B (en) | 2006-07-21 | 2006-07-21 | Method and system for address selection |
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| CN (1) | CN101110817B (en) |
| WO (1) | WO2008011776A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753633B (en) * | 2008-12-09 | 2013-06-05 | 华为技术有限公司 | Method, system and equipment for allocating IPv6 (internet protocol version 6) prefixes |
| CN101753460B (en) * | 2010-01-15 | 2012-07-11 | 杭州华三通信技术有限公司 | Method and device for processing internet protocol version 6(IPV6) routing prefix |
| CN102413033B (en) * | 2010-09-26 | 2015-07-08 | 华为技术有限公司 | Method, device and system for realizing route aggregation |
| CN102892108B (en) * | 2011-07-18 | 2017-04-26 | 中兴通讯股份有限公司 | Multiple address prefix distributing method and system |
| CN103379180B (en) * | 2012-04-18 | 2019-04-23 | 中兴通讯股份有限公司 | Station address distribution method and device |
| CN104883408A (en) * | 2014-02-28 | 2015-09-02 | 中兴通讯股份有限公司 | Method of processing NAT64 prefix, network equipment and DHCPv server |
| CN114448933A (en) * | 2020-10-20 | 2022-05-06 | 华为技术有限公司 | IP address allocation method, device and system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1543143A (en) * | 2003-04-29 | 2004-11-03 | ���ǵ�����ʽ���� | Wireless local area network system capable of supporting host mobility and an operation method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100550009B1 (en) * | 2003-11-13 | 2006-02-08 | 한국전자통신연구원 | Network terminal and packet routing method for ubiquitous computing |
| US8059661B2 (en) * | 2004-12-29 | 2011-11-15 | Cisco Technology, Inc. | Methods and apparatus for using DHCP for home address management of nodes attached to an edge device and for performing mobility and address management as a proxy home agent |
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| CN1543143A (en) * | 2003-04-29 | 2004-11-03 | ���ǵ�����ʽ���� | Wireless local area network system capable of supporting host mobility and an operation method therefor |
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| Publication number | Publication date |
|---|---|
| WO2008011776A1 (en) | 2008-01-31 |
| CN101110817A (en) | 2008-01-23 |
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