CN101902724A

CN101902724A - Method for discovering mobile agent in mobile IP and device thereof

Info

Publication number: CN101902724A
Application number: CN2009100519900A
Authority: CN
Inventors: 姚春燕; 郑军; 马松伟
Original assignee: Alcatel Lucent Shanghai Bell Co Ltd
Current assignee: Nokia Shanghai Bell Co Ltd
Priority date: 2009-05-26
Filing date: 2009-05-26
Publication date: 2010-12-01
Anticipated expiration: 2029-05-26
Also published as: CN101902724B

Abstract

The invention provides a method for discovering a mobile agent in a mobile IP. The mobile agent provides information used for indicating whether a home agent of the mobile agent supports DSMIPv4 for a mobile IP client of the mobile agent; the information can further comprise care-of address type indication which is supported by the mobile agent; the mobile IP client can provide mobile handoff information used for informing an IPv6 node of the opposite end of the mobile IP client according to the information, or further determine a DSMIPv4 option contained in the mobile IP registration request information of the mobile IP client. The technical scheme improves the evolution and transition from the mobile IPv4 to the mobile IPv6.

Description

Mobile agent discover method and device thereof among a kind of mobile IP

Technical field

The present invention relates to communication technical field, relate in particular to the discover method and the device thereof of mobile agent among a kind of mobile IP (the Internet).

Background technology

Mobile IP is meant mobile site, comprise computer, server, terminal, the network segment etc., with particular network IP address, realize crossing over the roaming function of different segment, and any change does not take place, the seamless link and the continual transmission of realization data in the network legal power that has guaranteed IP Network Based in roam procedure.

And in the access network that with DSL (Digital Subscriber Line) network, LAN (local area network (LAN)) etc. is the main flow access way is built, the introducing of wireless access technologys such as WiFi and development make following access network also need to support mobile IP function, and the IPv4 address space will exhaust rapidly in recent years, access network faces the transition to IPv6, and mobile IP also needs from mobile IPv 4 to the restriction of mobile IP v 6 evolution with the releasing IP address space thereupon.

From mobile IPv 4 to the process of mobile IP v 6 transition, mobile IPv 4 network and mobile IP v 6 network will coexist, and in the transition starting stage, the deployment meeting of mobile IPv 4 is more extensive than the deployment of mobile IP v 6.When a mobile node (MN) was mobile in the mobile IPv 4 network, tending to needed only to support the opposite end communication node (IPv6CN) of IPv6 to communicate by letter with one, and dual stack mobile IPv 4 (DSMIPv4) technology is a basic skills that solves this demand.

In a dual stack mobile IPv 4 is realized, a dual stack mobile node (DSMN) is told oneself dual stack home agent (DSMIPv4HA) with oneself prefix/address, IPv6 local and IPv4 home address (IPv4 HoA) and IPv4 Care-of Address (IPv4 HoA) by the registration request (rrq) message of mobile IP, and DSMIPv4HA will seal from the IPv6 of IPv6CN to be contained in and mail to this DSMN or the current Foreign Agent (DSMIPv4 FA) of this DSMN in the IPv4 tunnel.

But, the deployment of local/field network of DSMIPv4 is also discontinuous, in the mobile IP network structure as schematically shown in Figure 1, support the edge network 20 of mobile IP, 30,40,50 belong to dissimilar respectively, for example: when a DSMN 10A from one support mobile IPv 4 and fixedly the home network 20 of IPv6 (home network 10 of support moves to the home network 11 that a typical IPv4 field network 30 is supported, if DSMN 10A does not know whether the home agent 21 of oneself supports the DSMIPv4 function in home network 20 time, and only receiving the response of network to its registration request (rrq) message--after (RRP) message is replied in registration, succeed in registration whether judge home agent 21 support DSMIPv4 by judgement, the IPv6 bag load mode that allows; And when local agency 21 did not support DSMIPv4, in the time of can causing DSMN10A to move to field network 30, it and communicating to connect of IPv6 CN 60A can be interrupted suddenly on absence of aura ground, influenced user's experience; Equally, we can associate, when if DSMN 10A starts shooting in field network 30, it does not know whether the home agent of oneself supports the DSMIPv4 function, has only by the home agent that just can know oneself behind the registration failure and does not support DSMIPv4, so can cause network resources waste.

In addition, in a DSMIPv4 realized, DSMN can adopt two types Care-of Address (CoA): co-located care-of address (Co-CoA) and foreign agent care-of address (FA-CoA).In current MIPv4, a DSMN 10A moves to the home network 11 of typical IPv4 field network 30 supports from the home network 10 of a home network 20 supports, DSMN10A still can't judge the own Care-of Address type that is obtained, to such an extent as to there is following technical problem in the reality: if DSMN 10A thinks a FA-CoA by mistake to be Co-CoA, it requires HA 21 the IPv6 packet to be sent to the Care-of Address of oneself with the IPv4 tunnel by register requirement, then these IPv 6 packets can arrive first FA 31, and on the FA 31 or be not familiar with IPv6 bag, do not go to the route of this IPv6 bag, this bag all can be dropped under two kinds of situations, causes DSMN and opposite end IPv6 node 60A communication disruption; Otherwise, if DSMN 10A thinks Co-CoA by mistake to be FA-CoA, it requires HA 21 earlier the IPv6 packet to be sent to the home address (HoA) of oneself with the IPv4 tunnel by register requirement, the destination address that is the tunnel is the IPv4 home address (HoA) of DSMN 10A, and then this IPv4 tunnel packet is carried on a inside, IPv4 tunnel of going to foreign agent care-of address (FA-CoA), cause this IPv6 bag how just can be sent to Co-CoA, wasted HA 21 and the cpu resource of two nodes of DSMN 10A and the transmission bandwidth of point-to-point transmission with an IPv4 tunnel.

Summary of the invention

The present invention is intended to solve aforementioned one or more technical problem, provide a kind of mobile IPv 4 in the mobile IP v 6 transient process to the further perfect technical scheme of mobile agent.

According to an aspect of the present invention, a kind of discover method that is used for mobile IP mobile agent is provided here, and it comprises that step a), mobile agent provide one to be used to indicate its home agent whether to support the message of dual stack mobile IPv 4 (DSMIPv4) to its mobile IP customer terminal; Step b), mobile IP customer terminal can provide a mobile switching message that is used to notify its opposite end IPv6 node according to described message.

Preferably, mobile agent can further provide the Care-of Address type indication of its support in described message, and mobile IP customer terminal is determined the DSMIPv4 option that can comprise in its mobile IP login request message according to described Care-of Address type.

Preferably, aforementionedly indicate whether to support that the indication of DSMIPv4 or Care-of Address type also can offer mobile IP customer terminal by the special packet mode by certificate server behind the mobile IP customer terminal authentication success, for example behind the mobile IP customer terminal authentication success, accept message or internet key exchange message mode offers mobile IP customer terminal by remote customer dialing authentication.

According to another aspect of the present invention, a kind of communication equipment that mobile IP provides mobile agent that is used for is provided here, and it comprises that one is used for providing this mobile agent of indication whether to support the notifying device of dual stack agency's message to its mobile IP customer terminal.

Preferably, at this communication equipment during as Foreign Agent, notifying device can further provide the indication of the Care-of Address type that this mobile agent supports in described message.

According to another aspect of the present invention, provide a kind of mobile IP customer terminal equipment here, it comprises that one is used to obtain to indicate its home agent whether to support the receiving system of dual stack agency's message; And can provide a processing unit that is used to notify the mobile switching message of its opposite end IPv6 node according to described message.

Preferably, go up aforementioned mobile IP customer terminal equipment receiving system and can further obtain the message that its Foreign Agent is indicated its Care-of Address type of supporting; And described processing unit is determined the DSMIPv4 option that can comprise in its mobile IP login request message according to described Care-of Address type.

According to another aspect of the present invention, a kind of certificate server that authentication is provided to mobile IP customer terminal is provided here, it comprises an authenticate device, when the authentication request that provides mobile IP customer terminal, provides one to be used to indicate it to move the message whether home agent supports DSMIPv4.

Preferably, the aforementioned authenticate device Care-of Address type that further in described message, provides its Foreign Agent to support.

Description of drawings

By the detailed description with the accompanying drawing that proposes below, feature of the present invention, character and excellent

Naming a person for a particular job becomes more obvious, and components identical has identical sign in the accompanying drawing, wherein:

Fig. 1 is a kind of typical mobile IP network structural representation legend;

Fig. 2 A is mobile IP network topology example figure one provided by the present invention;

Fig. 2 B is mobile IP network topology example figure two provided by the present invention;

Fig. 3 A is mobile IP network topology example figure three provided by the present invention;

Fig. 3 B is mobile IP network topology example figure four provided by the present invention;

Fig. 4 A is a mobile agent advertisement extension example provided by the present invention;

Fig. 4 B-4C is that authentication message provided by the present invention-RADIUS accepts message.

Embodiment

Below in conjunction with accompanying drawing, preferred implementation of the present invention is described in detail.

Fig. 2 A is that one, one mobile IP customer terminal DSMN of mobile I P network configuration exemplary plot provided by the present invention 10A can obtain its home agent 21 ' whether support dual stack to move the indication of IP by home network 20.

For mobile agent-home agent 21 ' for, according to the embodiment of the invention, we can utilize mobile agent advertisement (Mobility Agent Advertisement) message to carry aforementioned indication, usually, home agent 21 ' mode by broadcast or multicast periodically sends the IP packet of mobile agent advertisement by name in home network 20, DSMN 10A receives this class packet, it just can conclude existence agency on its present residing link, mobile node from mobile agent ad data bag, can learn the home agent 21 that sends this statement ' IP address (being the source IP address in the packet), if this IP address has identical network prefix with the local ip address of DSMN 10A, DSMN 10A just can conclude that it is arranged in a home network so.What deserves to be mentioned is that DSMN 10A also can send mobile agent request (Mobility Agent Solicitation) packet on one's own initiative, impels the agency on this link to send the mobile agent advertisement at once, and does not wait for the arrival in next transmission cycle.

Here, we describe in conjunction with the mobile agent advertisement extension example one that Fig. 4 A is provided, we can utilize in the reservation position of mobile agent advertisement extension to indicate this mobile agent whether to support DSMPv4, and sign position D1 represents this mobile agent for " 1 " and supports DSMPv4 in the legend; On the contrary, D1 does not support DSMPv4 for " 0 " this mobile agent.

For mobile IP customer terminal DSMN 10A, according to the embodiment of the invention, its home agent 21 that is obtained by aforementioned mobile agent advertisement information before DSMN 10A utilizes its roaming to switch ' whether support the indication of DSMIPv4, it can notify the mobile switching message of its opposite end IPv6 node.If DSMN 10A does not support MIPv 4 home networks 20 roamings of DSMIPv4 to switch in any one field network 30 by one, and before switching it in home network 20 by home agent 21 ' on IPv6 (support the fixedly communication between the IPv6 node, needn't support mobile IP v 6 or DSMIPv4) function keeps flexibly connecting with the opposite end communication node 60A of an IPv6, this DSMN 10A can move switch forward direction opposite end communication node 60A or its DSMN and be similar to the prompting of " shifting out the IPv6 service area " at the home agent 21 of home network ' provide finishing at least so, to avoid flexibly connecting the disconnection of no any sign, cause bad business experience to the user.

Fig. 2 B is mobile IP network topology example figure two provided by the present invention, mobile IP customer terminal DSMN 10A starts shooting in field network 30, and it can obtain its home agent 21 ' whether support dual stack to move the indication of IP by the verification process of relevant mobile IP.

A kind of execution mode, comprise a certificate server 32 in the field network 30, Virtual network operator can with mobile agent equipment 21 ', 31 ' whether support dual stack agency's the indication and the mapping policy or the mapping relations of mobile node and their home agent equipment to dispose to this certificate server.Certificate server 32 is when receiving from mobile IP customer terminal DSMN 10A authentication request, if authentication passes through, it provide one its move home agent 21 ' whether support dual stack agency's indication.This indication can offer the network access equipment 33 of described mobile IP customer terminal by an authentication protocol message, and further offers DSMN 10A by it.

Insert the redetermination option of accepting in (Access Accept) message in conjunction with Fig. 4 B authentication message provided by the present invention-radius protocol, it by type, length, sign position D1, keep the position and constitute, wherein: " type " option is that " the professional indication of a DSMIPv4 " expression option is provided provide mobile IP relevant DSMI Pv4 service attribute to mobile IP customer terminal; " length " is set to this 4 byte; Sign position D1 is used to offer mobile IP customer terminal and indicates its home agent whether to support DSMIPv4, and typically, D1 represents the home agent of this mobile IP customer terminal correspondence for " 1 " and supports DSMPv4; On the contrary, D1 represents that for " 0 " home agent of this mobile IP customer terminal correspondence do not support DSMPv4.

Certainly, the mode that the indication in the aforementioned embodiments also can exchange (IKE) by internet key offers described DSMN 10A, is not repeated here.

Start obtains home agent 21 ' whether support dual stack to move the indication of IP by verification process in the field network 30, and so, it can promptly know whether before mobile IP registration can enable the DSMIPv4 function and far-end IP v6 node communicates.

Fig. 3 A, 3B are mobile IP network topology example provided by the present invention, a mobile IP customer terminal DSMN 10A is under the prerequisite of knowing its home network support DSMIPv4 by aforementioned manner, and it also can further obtain the message of the Care-of Address type of its Foreign Agent 31 ' its supports of indication by field network 30.

For mobile agent 31 ' for, according to the embodiment of the invention, we can utilize mobile agent advertisement (Mobility Agent Advertisement) message to carry aforementioned Care-of Address type indication equally, usually, Foreign Agent 31 ' mode by broadcast or multicast periodically sends the IP packet of mobile agent advertisement by name in field network 30, DSMN 10A receives this class packet, it just can conclude existence agency on its present residing link, mobile node from mobile agent ad data bag, can learn the Foreign Agent 31 that sends this statement ' IP address (being the source IP address in the packet), if this IP address has different network prefixs with the local ip address of DSMN10A, DSMN 10A just can conclude that it is arranged in a field network so.What deserves to be mentioned is that DSMN 10A also can send mobile agent request (Mobility Agent Solicitation) packet on one's own initiative, impels the agency on this link to send the mobile agent advertisement at once, and does not wait for the arrival in next transmission cycle.

Still be mobile agent advertisement extension example provided by the present invention one explanation in conjunction with Fig. 4 A, we can utilize a Care-of Address type of indicating this mobile agent to support in the mobile agent advertisement extension reservation position, sign position D2 represents this field network support co-located care-of address (Co-CoA) for " 1 " in the legend, on the contrary, D2 represents that for " 0 " this field network supports nonlocal Care-of Address (FA-CoA).

In addition, mobile IP customer terminal DSMN 10A also can further obtain the message that its field network is indicated the Care-of Address type of its support by its verification process in field network 30, and this message can provide by certificate server 32.

Comprise a certificate server 32 in the field network 30, Virtual network operator can with mobile agent equipment 21 ', 31 ' whether support the indication of Care-of Address type and corresponding care-of address configuration to give this certificate server.Certificate server 32 is when receiving from mobile IP customer terminal DSMN 10A authentication request, if authentication is passed through, it provides the Care-of Address type to described mobile IP customer terminal by the authentication protocol message.

Insert the redetermination option of accepting in (Access Accept) message in conjunction with Fig. 4 B authentication message provided by the present invention-radius protocol, it by type, length, sign position D1, keep the position and constitute, wherein: " type " option is that " the professional indication of a DSMIPv4 " expression option is provided provide mobile IP relevant DSMIPv4 service attribute to mobile IP customer terminal; " length " is set to this 4 byte; A sign position D2 is used to offer the Care-of Address type that mobile IP customer terminal indicates it to distribute: typically, D2 represents that for " 1 " Care-of Address in the Foreign Agent of this mobile IP customer terminal correspondence is co-located care-of address (Co-CoA); On the contrary, D2 represents that for " 0 " Care-of Address in the Foreign Agent of this mobile IP customer terminal correspondence is foreign agent care-of address (FA-CoA).

Certainly, the indication of the Care-of Address type in the aforementioned embodiments also can exchange (IKE) by internet key and must mode offer described DSMN 10A.

For mobile IP customer terminal DSMN 10A, it is indicated according to the Care-of Address type of its its support that is obtained from field network 30 and carries out the Care-of Address registration, and determine which kind of DSMIPv4 expansion it should use in registration request (rrq) message, known at mobile IP customer terminal DSMN 10A under the prerequisite of its home network 20 support DSMIPv4:

Illustrate as Fig. 3 A, when this DSMN 10A is switched in the field network 30 by home network 20 roamings, if DSMN 10A learns this field network 30 support co-located care-of address (Co-CoA) according to described indication, this moment, DSMN 10A inserted " IPv6 prefix request expansion (IPv6 Prefix Request Extension) " and " IPv6 tunnel mode expansion (IPv6t unneling mode extension) " in the expansion item of rrq message, and the reference address of rrq message is that the co-located care-of address (Co-CoA) that is obtained is told DSMIPv4HA21 ', can be encapsulated in the tunnel of a destination address for the Co-CoA of this DSMN from the IPv6 bag of IPv6 CN 60A and send this DSMN 10A to; On the contrary, illustrate as Fig. 3 B, if DSMN10A learns this field network 30 support foreign agent care-of address (FA-CoA) according to described indication, DSMN 10A only inserts " IPv6 prefix request expansion (IPv6 Prefix Request Extension) " and tells DSMIPv4 HA 21 ' that it requires earlier the IPv6 bag to be sent to the IPv4 tunnel home address (HoA) of oneself in the expansion of rrq message, the destination address that is the tunnel is the IPv4 home address (HoA) of DSMN, and then with this IPv4 tunnel packet be carried on one go to foreign agent care-of address (FA-CoA) 31 ' IPv4 tunnel the inside.

Although above-mentioned being illustrated as the invention provides some embodiment; be not to be used for limiting protection scope of the present invention; the professional in present technique field can carry out various modifications to embodiment under the prerequisite that does not depart from the scope of the present invention with spirit, this modification all belongs in the scope of the present invention.

Claims

1. discover method that is used for mobile IP mobile agent is characterized in that comprising:

Step a), mobile agent provide one to be used to indicate its home agent whether to support the message of dual stack mobile IPv 4 (DSMIPv4) to its mobile IP customer terminal.

Step b), mobile IP customer terminal can provide a mobile switching message that is used to notify its opposite end IPv6 node according to described message.

2. the method for claim 1, it is characterized in that in the step a), mobile agent can further provide the Care-of Address type indication of its support in described message, mobile IP customer terminal is determined the DSMIPv4 option that can comprise in the step b) in its mobile IP login request message according to described Care-of Address type.

3. method as claimed in claim 1 or 2 is characterized in that described message is the mobile agent advertisement information.

4. method as claimed in claim 3 is characterized in that described mobile agent advertisement information can utilize the sign position of its reservation to indicate this mobile agent whether to support DSMIPv4 or/and the Care-of Address type.

5. method as claimed in claim 1 or 2 is characterized in that described message can accept message mode by remote customer dialing authentication by certificate server and offer mobile IP customer terminal behind the mobile IP customer terminal authentication success.

6. method as claimed in claim 1 or 2 is characterized in that described message can offer described moving IP client by internet key exchange message mode by certificate server behind the mobile IP customer terminal authentication success.

7. method as claimed in claim 1 or 2 is characterized in that in the step b), if the mobile agent in the home network is not supported DSMIPv4, mobile IP customer terminal is notified its opposite end IPv6 node communication to connect and is about to interrupt and reason.

8. one kind is used for the communication equipment that mobile IP provides mobile agent, it is characterized in that comprising:

Notifying device: be used for providing this mobile agent of indication whether to support dual stack agency's message to its mobile IP customer terminal.

9. communication equipment as claimed in claim 8 is characterized in that notifying device further provides the indication of the Care-of Address type that this mobile agent supports in described message.

10. communication equipment as claimed in claim 8 or 9 is characterized in that described message is the mobile agent advertisement information.

11. communication equipment as claimed in claim 10 is characterized in that described mobile agent advertisement information can utilize the sign position of its reservation to indicate this mobile agent whether to support DSMIPv4 or/and the Care-of Address type.

12. a mobile IP customer terminal equipment is characterized in that comprising:

Receiving system: be used to obtain the message whether its home agent supports dual stack agency indication;

Processing unit: the message according to described dual stack agency indication can provide a mobile switching message that is used to notify its opposite end IPv6 node.

13. mobile IP customer terminal equipment as claimed in claim 12 is characterized in that described receiving system further obtains the message that its Foreign Agent is indicated its Care-of Address type of supporting; Described processing unit is determined the DSMIPv4 option that can comprise in its mobile IP login request message according to described Care-of Address type.

14., it is characterized in that processing unit is notified its opposite end IPv6 node communication to connect and is about to interrupt and reason as claim 12 or 13 described mobile IP customer terminal equipment if the mobile agent in the home network is not supported DSMIPv4.

15. one kind provides the certificate server of authentication to mobile IP customer terminal, it is characterized in that comprising:

Authenticate device: when the authentication request that provides mobile IP customer terminal, provide one to be used to indicate it to move the message whether home agent supports DSMIPv4.

16. certificate server as claimed in claim 15 is characterized in that described authenticate device further provides one to be used to the Care-of Address type of indicating its Foreign Agent to support in described message.

17., it is characterized in that described message can accept message mode by remote customer dialing authentication and offer mobile IP customer terminal behind the mobile IP customer terminal authentication success as claim 15 or 16 described certificate servers.

18., it is characterized in that described message can offer described moving IP client by the internet key exchanged form behind the mobile IP customer terminal authentication success as claim 15 or 16 described certificate servers.