CN102098352B - Network system and method for supporting host computer mobility in Internet protocol version 4 (IPv4)-Internet protocol version 6 (IPv6) hybrid network environment - Google Patents
Network system and method for supporting host computer mobility in Internet protocol version 4 (IPv4)-Internet protocol version 6 (IPv6) hybrid network environment Download PDFInfo
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Abstract
The invention discloses a network system and a network method for supporting host computer mobility in an Internet protocol version 4 (IPv4)-Internet protocol version 6 (IPv6) hybrid network environment. The system is provided with a dynamic host configuration protocol (DHCP) server, a host computer, a mapping server and a boundary router, wherein functional modules are extended for the DHCP server and the host computer; the added mapping server is only used for storing the mapping relation between a host computer home address which belongs to a domain before movement and an intra-site automatic tunnel addressing protocol (ISATAP) care-of address after movement; the boundary router is required to support dual stacks and an ISATAP, and is used for recording an identifier (ID) and a boundary router address of the domain where the host computer is positioned in a newly-added option field of a DHCP response message; and the host computer can detect the mobility of the host computer to obtain the ID and the boundary router address of the domain, and transmits a mapping update message to the mapping server and an opposite communication end. By the system and the method, the mobility in a transition stage from the IPv4 to the IPv6 is well supported, the conventional IPv4 network equipment is fully utilized, and capitals and manpower needed by the updating of the transition stage and the deployment of new equipment are reduced. The network system has a simple structure, the mapping server has simple functions, any manual configuration is not required, and good popularization prospect is achieved.
Description
Technical field
The present invention relates to a kind of network system and method for supporting host mobility under IPv4 and IPv6 hybrid network environment, belong to the technical field of network service.
Background technology
Along with the fast development of the Internet, people are also growing to the demand of host mobility.But existing network environment still is in transition stage, and probably under the environment of the hybrid network that all is in this IPv4 and IPv6 in the quite a while from now on.Fig. 1, Fig. 2 and shown in Figure 3 be exactly several mobility communication scenes that may occur in transition stage.Fig. 1 is that the two stack main frame passing through IPv 6 core net that are in the IPv4 environment are carried out IPv6 communication, and two stack main frames move in the IPv4 network domains.Fig. 2 is that the two stack main frame passing through IPv 6 core net that are in the IPv4 environment are carried out IPv6 communication, and two stack main frames move between the IPv4 network domains.Fig. 3 is in two stack main frames in the IPv6 network and the two stack main frames in the IPv4 network communicate, and two stack main frames are from the IPv6 Network Mobility to the IPv4 network.In prior art, can complete the transmission of IPv6 packet in the IPv4 network that two stack main frames send with the tunneling technique of IPv6in IPv4.But, consideration and the imperfection of prior art to the host mobility of this transition scene.
First introduce the automatic tunnel technology of a kind of existing IPv6in IPv4: automatic tunnel addressing protocol ISATAP(Intra-Site Automatic Tunnel Addressing Protocol in standing) (rfc5214).The address of Intra-site Automatic Tunnel Addressing Protocol has specific format (referring to Fig. 4), when two stack main frames are supported ISATAP, can automatically generate the prefix (FE80: :) of link-local and the interface identifier of 64 at tunnel interface:: 0:5EFE:w.x.y.z(wherein w.x.y.z is the IPv4 unicast address), so just consisted of an ISATAP link-local address, main frame can utilize in this address and same territory other ISATAP main frames to carry out IPv6 and communicate by letter.If need and ISATAP main frame or the IPv6 main-machine communication of other networks, must by the ISATAP router obtain the global unicast address prefix (2001:, 2002:, 3FFE :), by router and other IPv6 main frame and network service.
Although the Intra-site Automatic Tunnel Addressing Protocol technology has solved the transmission problem of IPv6 packet in the IPv4 network that two stack main frames send, but, when two stack host mobilities in pure IPv4 territory, when needing to adopt Intra-site Automatic Tunnel Addressing Protocol and opposite end main frame to communicate, this technology can not support main frame automatically to form new Intra-site Automatic Tunnel Addressing Protocol address, and namely it does not support the mobility of lower pair of stack main frame of this scene.
Another kind of prior art is mobile IP technology: the course of work of mobile IPv 4 mainly contains agency's search and mobile testing process, registration process and routing procedure.Change the tie point of its Internet when mobile host after, mobile host can judge it oneself is on home network or field network by the proxy announcement message of receiving.If find that oneself has moved to field network, it will obtain a Care-of Address on this field network, and then, mobile host is to its Care-of Address of home agent registration.Home agent is intercepted and captured the grouping of mailing to the mobile host home address, and will divide into groups to send to mobile host via Foreign Agent.After this, the grouping that mobile host sends will directly send to Correspondent Node, need not pass through home agent.The mobile IPv 4 technology can remain in the constant situation in IP address, continues and Correspondent Node keeps communicate by letter, and this makes mobile host after leaving home network, still can the front original communication of IP address maintenance of enough movements.
Compare with IPv4, IPv6 has larger address space, and because of the automatic advantage of the aspects such as configuration and neighbor discovery mechanisms in the address, makes address configuration and the course of work of mobile IP v 6 of mobile host after being moved simpler.Mobile IPv 6 protocol has removed Foreign Agent, mobile host is completed mobile testing process by neighbor discovery mechanisms, and according to the router advertisement message RA(Router Advertisement from new router that receives) in network prefix, form Care-of Address; Then send binding update messages to home agent and Correspondent Node main frame, all set up the binding relationship of home address and Care-of Address at home agent and Correspondent Node main frame, communication process with latter two main frame just no longer needs through home agent, has avoided " triangle route " problem in the mobile IPv 4.
But, no matter be mobile IPv 4 technology or Mobile IPv 6, host mobility when all only having considered between pure IPv4 environment communication between communication and pure IPv6 environment, and ignored the mobility of transition stage, so it exists following two defectives: be not supported in two stack main frames in pure IPv4 network pass through pure IPv6 network or with pure IPv6 network in the IPv6 main-machine communication time, two stack main frames pure IPv4 network internal or between move or two kinds of scenes that two stack main frame moves between pure IPv4 network and IPv6 network.
The third prior art be HIP to the support of host mobility, HIP has designed convergence server RVS(Rendezvous Server for node mobility), it has stored the mapping relations of main frame HIT-IP, is used for inquiry mobile node current IP address.During initial communication, main frame wants first to register to RVS the mapping of the HIT-IP of oneself, and the I1 message that the originating end of then communicating by letter sends is forwarded to destination node via RVS.Subsequently, all follow-up packets are all sent by communicating pair, and RVS just no longer participates in.
When Host Detection is mobile to oneself, first to send updating message to RVS, upgrade the map information of the HIT-IP of oneself, then continue to send packet to Correspondent Node, complete new HIP and substantially exchange, the address information of notice Correspondent Node oneself, the session connection before continuing.
HIP relies on the mobility of the modification of legacy protocol level being supported better main frame, but also there is following problem: the same with mobile IP technology, do not take into full account host mobility scene and communication process thereof that transition stage may occur, the host mobility when only having considered between pure IPv4 environment communication between communication and pure IPv6 environment.When main frame is moved, deeply do not consider the mobile process that detects and form new address of mobile host.
Summary of the invention
in view of this, the objective of the invention is for as Fig. 1, the mobility communication scenes that Fig. 2 and several transition stages shown in Figure 3 may occur, a kind of network system and method for supporting host mobility under IPv4 and IPv6 hybrid network environment is provided, so that two stack main frames move to the IPv4 network domains from IPv4 network domains or IPv6 network domains, in the time of need to communicating with IPv6in IPv4 tunnel, mobile host can the automatic acquisition border router the address and the sign in territory, again according to its be occur to move in the territory or the territory between move, utilize the Intra-site Automatic Tunnel Addressing Protocol technology to form the Intra-site Automatic Tunnel Addressing Protocol address, then send updating message to mapping server and Correspondent Node, after making host mobility, original communication can continue.
In order to achieve the above object, the invention provides a kind of network system of supporting host mobility under IPv4 and IPv6 hybrid network environment, be provided with dynamic host configuration protocol DHCP (Dynamic Host Configuration Protocol) server, main frame and border router; It is characterized in that: mix the mobility of scene in order to support IPv4 and IPv6, this system has all expanded functional module to Dynamic Host Configuration Protocol server and main frame, and sets up mapping server; Wherein,
Dynamic Host Configuration Protocol server, be positioned at pure IPv4 territory, be used for to host assignment IPv4 address, the pure IPv4 domain identifier ID that records the main frame place and the address of this domain border router, and these information added in the DHCP response message of newly-increased Option Field, send to main frame; During the new IPv4 address of the newly-increased Option Field of the described DHCP response message Dynamic Host Configuration Protocol server application in territory, place that is mobile host after mobile, the field that Dynamic Host Configuration Protocol server adds in the DHCP response message of replying, be used for informing the address of the border router in the ID in main frame this territory and this territory, so that after in host mobility to pure IPv4 territory, can the new Intra-site Automatic Tunnel Addressing Protocol address prefix of automatic acquisition;
Main frame is two stack main frames of supporting simultaneously IPv4 agreement and IPv6 agreement, have the ISATAP interface and can use Intra-site Automatic Tunnel Addressing Protocol to complete to communicate by letter; This main frame support chain line state measuring ability is to detect the mobile behavior of main frame; This main frame is also supported dhcp client, and expand the function of traditional dhcp client, after receiving the DHCP response message of described newly-increased Option Field, except resolving newly assigned IPv4 address information, also resolve this field, with the ID that obtains the territory, place and the address of border router thereof, then the comparison domain id field judge occur to move between the territory or the territory in mobile, in order to carry out the operation of the follow-up ISATAP of formation Care-of Address; This main frame is after moving and form new address, send map updating message to mapping server and Correspondent Node, upgrading oneself mobile forward and backward home address and the map information of ISATAP Care-of Address, and process the renewal response message that mapping server and Correspondent Node return;
Mapping server is provided with three modules: map information reception/sending module, map information memory management module and map information enquiry module; Be provided with a mapping server in each territory, be responsible for safeguarding the home address of the mobile host that belongs to this territory before moving and the map information of ISATAP Care-of Address; The mapping server that is positioned at pure IPv4 territory is the two stack main frames that have the ISATAP interface, support Intra-site Automatic Tunnel Addressing Protocol, is positioned at the mapping server support IPv6 agreement in pure IPv6 territory;
Border router lays respectively at the edge in pure IPv4 territory or pure IPv6 territory, is the dual-stacker router of supporting ISATAP.
In order to achieve the above object, the present invention also provides a kind of method of work of supporting the network system of host mobility under IPv4 and IPv6 hybrid network environment, described host mobility comprises two kinds: move in the territory of the place migration of main frame in same border router compass of competency, and main frame moves in the border router compass of competency between territory in another border router compass of competency and moves; It is characterized in that: described method comprises following operating procedure:
The mobile detection and the formation of new address of (1) carrying out after host mobility: main frame adopts link state detection method to judge whether oneself is moved; If movement has occured, this mobile host sends the DHCP request message to Dynamic Host Configuration Protocol server immediately, then this mobile host is resolved relevant information from the expansion DHCP response message of replying, and utilizes the Intra-site Automatic Tunnel Addressing Protocol technology to form new address: the ISATAP Care-of Address after mobile;
(2) mobile host upgrades map information to mapping server: mobile host adopts Intra-site Automatic Tunnel Addressing Protocol technology and standard routing mechanism to upgrade the map information of its home address and described ISATAP Care-of Address to mapping server, so that only know that other main frames of this mobile host home address can communicate with; This step comprises following content of operation:
(21) mobile host utilize the Intra-site Automatic Tunnel Addressing Protocol technology ISATAP interface judgement upgrade mapping message destination address, be whether the mapping server address is positioned at this territory; If, the order execution in step (22); Otherwise, redirect execution in step (24);
(22) mobile host is directly set up Intra-site Automatic Tunnel Addressing Protocol with mapping server, sends the renewal mapping message to mapping server;
(23) after mapping server receives this message and processing, upgrade the home address of this mobile host and the map information of ISATAP Care-of Address in local data base; Then, return to the renewal response message by the direct-connected Intra-site Automatic Tunnel Addressing Protocol of having set up to this mobile host; Finish the operation of this step (2);
(24) mobile host will upgrade in the Intra-site Automatic Tunnel Addressing Protocol mode border router that mapping message sends to territory, mobile rear place;
(25) border router carries out decapsulation after receiving the renewal mapping message of encapsulation, and will upgrade the border router that mapping message is routed to territory, mapping server place; If in the IPv4 territory, the mapping server that namely this mobile host is corresponding is positioned at the IPv4 territory to mobile host in mobile anteposition, the order execution in step (26); If in the IPv6 territory, the mapping server that namely this mobile host is corresponding is positioned at the IPv6 territory to mobile host in mobile anteposition, redirect execution in step (27);
(26) border router in mapping server place IPv4 territory will upgrade mapping message in the Intra-site Automatic Tunnel Addressing Protocol mode and send to mapping server; Redirect execution in step (28);
(27) border router in mapping server place IPv6 territory will upgrade mapping message by the standard routing mechanism and send to mapping server;
(28) after mapping server receives and upgrades mapping message and processing, upgrade the home address of mobile host and the map information of ISATAP Care-of Address in local data base; Then, return to the renewal response message for this mobile host according to identical path;
(3) mobile host upgrades map information to Correspondent Node: mobile host adopts Intra-site Automatic Tunnel Addressing Protocol technology and standard routing mechanism to upgrade the map information of its home address and described ISATAP Care-of Address to Correspondent Node, so that the packet that Correspondent Node sends can directly send to mobile host;
(4) set up communication link, realize conversation: after completing above-mentioned steps, mobile host just can continue to carry out session with Correspondent Node, and communication process is front identical with host mobility.
Technological innovation part of the present invention is: first the DHCP agreement is expanded, increased ID and this domain border router address that field is carried the territory, place in the DHCP response message.A kind of network system architecture of supporting host mobility under IPv4 and IPv6 hybrid network environment has been proposed, in this system, the function of mapping server is to safeguard the home address of the mobile host that belongs to this territory and the map information of ISATAP Care-of Address, and only needs a mapping server in each territory.The function of Dynamic Host Configuration Protocol server except giving host assignment IPv4 address, the address that also will record ID He this domain border router in its territory, place.Mobile host, is made comparisons to the territory id field after obtaining the ID in territory, place as dhcp client, judgement be occur to move between the territory or the territory in movement.Border router in this system must be the dual-stacker router of supporting Intra-site Automatic Tunnel Addressing Protocol.In addition, a kind of method of supporting host mobility under IPv4 and IPv6 hybrid network environment is also proposed.
Advantage of the present invention and effect are: the inventive method can support IPv4 to the mobility of IPv6 transition stage well; still adopt the IPv4 router in pure IPv4 territory; do not do any change; only have border router need to upgrade to the dual-stacker router of supporting Intra-site Automatic Tunnel Addressing Protocol; so just can take full advantage of and protect the existing IPv4 network equipment, reduce that transition stage is used for upgrading and fund and the manpower of deployment facility.The function of the mapping server that the present invention sets up is just: be used for the home address of mobile host in store home this territory and the mapping relations of ISATAP Care-of Address; Its quantity also obviously reduces than home agent simultaneously, and it no longer is confined to the home link of main frame, ensures a mapping server in each territory and gets final product.The inventive method is without any need for manual configuration, and compare with mobile IPv 4, saved the expense of Foreign Agent network element, after the router in the territory all is upgraded to IPv6, the packet that forwards through this territory can directly adopt IPv6 to forward, just do not need to enable the process of Intra-site Automatic Tunnel Addressing Protocol, thereby realized the seamlessly transit ability of the network equipment from IPv4 to IPv6.Therefore, the present invention has good popularizing application prospect.
Description of drawings
Fig. 1 mobile scene graph that is two stack main frames in the IPv4 territory.
Fig. 2 mobile scene graph that is two stack main frames between the IPv4 territory.
To be two stack main frames move to the scene graph in IPv4 territory to Fig. 3 from the IPv6 territory.
Fig. 4 is the form schematic diagram of Intra-site Automatic Tunnel Addressing Protocol address.
Fig. 5 mobile network system schematic diagram that is of the present invention pair of stack main frame in the IPv4 territory.
Fig. 6 mobile network system schematic diagram that is of the present invention pair of stack main frame between the IPv4 territory.
To be of the present invention pair of stack main frame move to the network system schematic diagram in IPv4 territory to Fig. 7 from the IPv6 territory.
Fig. 8 is the format chart of the newly-increased Option Field of DHCP response message of the present invention.
Fig. 9 supports the network system of host mobility to form structure chart under IPv4 of the present invention and IPv6 hybrid network environment.
Figure 10 is the complete course of work sequential chart that of the present invention pair of stack main frame moves in the territory.
Figure 11 is the complete course of work sequential chart that of the present invention pair of stack main frame moves between the territory.
Figure 12 is that the inventive method mobile moving in the territory detects and new address forming process sequential chart.
Figure 13 is that the inventive method mobile moving between the territory detects and new address forming process sequential chart.
Figure 14 is that the network system of host mobility in the IPv4 under the network architecture that ID/Locator separates that introduces of the embodiment of the present invention and IPv6 hybrid network environment forms structure chart.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, Fig. 2 and Fig. 3, introduce several host mobility scenes that may occur in transition stage that the present invention is suitable for.When being in two stack main frames in the IPv4 network environment and needing the passing through IPv 6 network environment to communicate, must use the tunneling technique of IPv6in IPv4, be the address, tunnel (as shown in Figure 4) that main frame must form an IPv6 address format, wherein the prefix of address, tunnel will just can be obtained to the border router application.In existing mobile IPv 4 technology, when host mobility is in the new IPv4 territory, main frame can distribute or DynamicHost arranges protocol DHCP (Dynamic Host Configuration Protocol) and obtains new IPv4 address by Foreign Agent, but tunnel address prefix that can't automatic acquisition IPv6 form, so just can not form new address, tunnel, communication will be interrupted.
In order to address the above problem, thinking of the present invention is: when in two stack host mobilities to pure IPv4 territory, by expansion DHCP agreement and two stack host function, and the border router of mapping server, Dynamic Host Configuration Protocol server and support Intra-site Automatic Tunnel Addressing Protocol technology is set in network, mobile host can automatic acquisition the address of border router of institute's access network and the sign in territory, according to the sign judgement in territory be move in the territory or the territory between move.If mobile in the territory, utilize the Intra-site Automatic Tunnel Addressing Protocol technology automatically to form the ISATAP Care-of Address for mobile host; If move between the territory, first utilize the neighbor discovery mechanisms of Intra-site Automatic Tunnel Addressing Protocol technical support automatically for mobile host obtains the tunnel address prefix, then automatically formed the ISATAP Care-of Address in this locality by mobile host.After having obtained new ISATAP Care-of Address, then map information between the home address that mobile host need to upgrade mobile host to mapping server and Correspondent Node main frame and the new ISATAP Care-of Address that forms utilizes communicating by letter between this ISATAP Care-of Address continuation and opposite end main frame.
After making in host mobility to pure IPv4 territory, can the new Intra-site Automatic Tunnel Addressing Protocol address prefix of automatic acquisition, the present invention expands the DHCP agreement, during the new IPv4 address of mobile host Dynamic Host Configuration Protocol server application in territory, place after mobile, newly add an Option Field in the DHCP response message that Dynamic Host Configuration Protocol server is replied, be used for informing the address of the border router in the ID in main frame this territory and this territory.
Referring to Fig. 8, introduce 4 parts of newly-increased Option Field form in the DHCP response message: type (Type), length (Length), domain identifier (Domain ID) and border router address (Edge Router Addresses).
Type Type is the sign of this newly-increased Option Field, mixed with character by specific numeral, character or numeral and consist of, for the address that illustrates that this field store content is domain identifier and border router, so that main frame can find this field fast, clearly after receiving the DHCP response message.
Length L ength is the length of this Option Field.
Domain identifier Domain ID is the ID in territory, is used for distinguishing different territories; When main frame moves, do not need again to obtain the Intra-site Automatic Tunnel Addressing Protocol address prefix in the territory; But when moving between the territory, different because of the Intra-site Automatic Tunnel Addressing Protocol address prefix in each IPv4 territory, mobile host will obtain new Intra-site Automatic Tunnel Addressing Protocol address prefix to border router, therefore newly-increased this Option Field; In same IPv4 territory, this field contents of different Dynamic Host Configuration Protocol server is identical, and this field contents of the Dynamic Host Configuration Protocol server in different IP v4 territory is different;
Border router address Edge Router Addresses is the IPv4 address of border router, because the border router in this territory may not only have 1, the address of this field is one or more.
Referring to Fig. 9, introduce the present invention supports host mobility under IPv4 and IPv6 hybrid network environment network system composition structure (supporting to form respectively as Fig. 5, Fig. 6, shown in Figure 7 as Fig. 1, Fig. 2 and three kinds of network architectures of the present invention at the mobile context of transition stage shown in Figure 3).In order to be supported in the host mobility of IPv4 and IPv6 mixing scene, the border router of Dynamic Host Configuration Protocol server, main frame, mapping server and support Intra-site Automatic Tunnel Addressing Protocol technology to be set in each IPv4 network domains.Network system of the present invention is all expanded the function of the Dynamic Host Configuration Protocol server in existing network and main frame, and sets up mapping server, and lower mask body is introduced the concrete function of each network element in network system of the present invention:
Dynamic Host Configuration Protocol server is arranged in pure IPv4 territory, except can giving host assignment IPv4 address, also needs to record the address of id information and this IPv4 domain border router in its territory, place, and these information are joined in the DHCP response message, sends to main frame.In order to complete expanded function, except existing DHCP request message reception/processing module, the IPv4 address information arranges module and DHCP response message sending module, Dynamic Host Configuration Protocol server increases a module newly: territory ID and border router information are stored and module are set, be responsible for the ID in territory, Dynamic Host Configuration Protocol server place and border router address are stored in this Dynamic Host Configuration Protocol server, and be arranged at newly-increased Option Field in the DHCP response message.
Because the main frame that is positioned at the IPv4 territory will use Intra-site Automatic Tunnel Addressing Protocol communication, no matter so under conventional TCP/IP network framework, or under novel I D/Locator separated network framework, also no matter it moves anteposition in pure IPv4 territory or pure IPv6 territory, be necessary for and have the ISATAP interface to support Intra-site Automatic Tunnel Addressing Protocol to complete two stack main frames of communication.In addition, main frame need to be supported dhcp client, and traditional dhcp client is carried out Function Extension, make main frame after the DHCP response message of receiving the newly-increased Option Field of the present invention, can resolve this field, obtain the address of ID and the border router in territory, place, and by the analysis domain id field, judge whether to occur to move between the territory or the territory in mobile, the operation that forms the ISATAP address to carry out next step.Main frame also needs to have the function that sends map updating message to mapping server and Correspondent Node, with the home address that upgrades oneself and the map information of ISATAP Care-of Address, and can process the renewal response message that mapping server and Correspondent Node return.
Whether main frame is moved in order to detect oneself, in order to obtain the address of ID and the border router in territory, form overall routable Intra-site Automatic Tunnel Addressing Protocol address, and send map updating message to mapping server and Correspondent Node respectively, newly-increased following five modules: the Link State detection module, newly add field parsing module, territory ID relatively and memory module, address, global I SATAP tunnel form module, upgrade map information sending/receiving module.Wherein,
Whether the Link State detection module is responsible for monitoring the connection of host link, be moved to judge this main frame; If movement has occured, trigger this main frame and send the DHCP request message.
The new field parsing module that adds is responsible for resolving newly-increased Option Field in the DHCP response message, obtains the ID in territory, the current place of main frame and the address of border router.
Territory ID relatively is responsible for comparing with the territory ID that is stored in main frame this locality resolving new territory ID that dhcp message obtains with memory module, the judgement main frame be occur to move in the territory or the territory between move; If both are identical, illustrate that main frame is mobile in the territory, need not change the territory ID that is stored in main frame this locality; If both are different, illustrate that main frame is to move between the territory, the territory ID that needs to be stored in main frame this locality changes to and resolves the new territory ID that obtains.
Address, global I SATAP tunnel forms module and is used for forming address, global I SATAP tunnel according to the comparative result of ID comparison in territory with memory module; If mobile in the territory, directly form address, global I SATAP tunnel in this locality; If move between the territory, first to the new Intra-site Automatic Tunnel Addressing Protocol address prefix of border router application, form again address, global I SATAP tunnel in this locality after obtaining this prefix.
Upgrade map information sending/receiving module, be responsible for structure and send upgrading mapping message, send to respectively mapping server and Correspondent Node, and receive and process the renewal response message that mapping server and Correspondent Node return.
Mapping server is positioned at territory, the front place of host mobility, and each mapping server can be managed the main frame in a territory.No matter mapping server is positioned at pure IPv4 territory or pure IPv6 territory, and unique function of mapping server of the present invention is to safeguard the home address of mobile host and the map information of ISATAP Care-of Address.The mapping server that is positioned at pure IPv4 territory must be supported two stacks, has the ISATAP interface and supports Intra-site Automatic Tunnel Addressing Protocol, and the mapping server that is positioned at pure IPv6 territory is the IPv6 main frame.In order to complete function, mapping server is provided with following three modules: map information reception/sending module, map information memory management module and map information enquiry module.
Map information reception/sending module is responsible for the updating message of the map information of Receiving Host transmission, and constructs and send and upgrade response message to main frame.
The map information that the map information memory management module is responsible for receiving is stored in local data base, can safeguard many map informations of a main frame, and the map information of safeguarding here is that two length are the mapping between the address of 128.
The map information enquiry module is responsible for querying mapping information from the local data base of Storage Mapping information.When the Correspondent Node main frame is only known the home address of mobile host, mapping server will be intercepted and captured the packet that mails to the mobile host home address, and call this module querying mapping information, the map information of inquiring about is returned to map information reception/sending module process.
Border router is positioned at the edge in IPv4 territory or IPv6 territory, is the dual-stacker router of supporting ISATAP.
the present invention also provides a kind of method of work of supporting the network system of host mobility under IPv4 and IPv6 hybrid network environment, host mobility in IPv4 and IPv6 mixing scene has two kinds: move (shown in Figure 5 in the territory of the place migration of main frame in same border router compass of competency, its move detect and the complete course of work that new address forms as shown in figure 12), and main frame moves in the border router compass of competency between territory in another border router compass of competency and moves (referring to Fig. 6 or shown in Figure 7, its move detect and the complete course of work that new address forms as shown in figure 13).
Under this mixing scene, no matter be to move between mobile in the territory or territory, the inventive method all comprises following four steps:
Step 1, the mobile detection and the formation of new address of carrying out after host mobility: main frame adopts link state detection method to judge whether oneself is moved; If movement has occured, this mobile host sends the DHCP request message to Dynamic Host Configuration Protocol server immediately, then this mobile host is resolved relevant information from the expansion DHCP response message of replying, and utilizes the Intra-site Automatic Tunnel Addressing Protocol technology to form new address: the ISATAP Care-of Address after mobile.
This step 1 comprises following content of operation:
(11) main frame adopts the method for Link State detection to carry out Move Detection, is used for the connection of monitoring host link, judges whether it is moved; If be moved, trigger main frame and carry out subsequent step (12); Otherwise main frame is not carried out any operation;
(12) mobile host first sends the DHCP request message to the Dynamic Host Configuration Protocol server in territory, mobile rear place, and request distributes a new IPv4 address, and requires reply to inform the sign ID in this territory, main frame place and the address of border router;
(13) after Dynamic Host Configuration Protocol server is received request, the DHCP response message of the expansion of construction complete is replied to mobile host, this response message is added the sign ID in this territory, Dynamic Host Configuration Protocol server place and the address of border router at newly-increased Option Field;
(14) mobile host is resolved the DHCP response message that receives, and gets own new IPv4 address, the sign ID in territory, mobile rear place and the address of this domain border router; Then, this mobile host starts Intra-site Automatic Tunnel Addressing Protocol, forms the ISATAP link-local address in the territory after movement;
(15) the territory ID of mobile host before with the movement of the ID in this territory and its storage compares, if both are identical, is judged as the movement territory in, redirect execution in step (18); If different, be judged as between the territory and move, after first the ID of neofield being stored in this locality, order execution in step (16);
(16) mobile host sends the router solicitation message RS of clean culture to border router by Intra-site Automatic Tunnel Addressing Protocol, after border router receives RS, also return to for this mobile host to comprise the unicast router bulletin RA of the prefix information of ISATAP address, this territory by Intra-site Automatic Tunnel Addressing Protocol;
(17) after mobile host receives RA, parse the prefix information of the ISATAP address in this territory;
(18) mobile host utilizes the Intra-site Automatic Tunnel Addressing Protocol technology automatically to form overall routable ISATAP Care-of Address in this locality.
Step 2, mobile host upgrades map information to mapping server: mobile host adopts Intra-site Automatic Tunnel Addressing Protocol technology and standard routing mechanism to upgrade the map information of its home address and described ISATAP Care-of Address to mapping server, so that only know that other main frames of this mobile host home address can communicate with.
This step 2 comprises following content of operation:
(21) mobile host utilize the Intra-site Automatic Tunnel Addressing Protocol technology ISATAP interface judgement upgrade mapping message destination address, be whether the mapping server address is positioned at this territory; If, the order execution in step (22); Otherwise, redirect execution in step (24);
(22) mobile host is directly set up Intra-site Automatic Tunnel Addressing Protocol with mapping server, sends the renewal mapping message to mapping server;
(23) after mapping server receives this message and processing, upgrade the home address of this mobile host and the map information of ISATAP Care-of Address in local data base; Then, return to the renewal response message by the direct-connected Intra-site Automatic Tunnel Addressing Protocol of having set up to this mobile host; Finish the operation of this step (2);
(24) mobile host will upgrade in the Intra-site Automatic Tunnel Addressing Protocol mode border router that mapping message sends to territory, mobile rear place;
(25) border router carries out decapsulation after receiving the renewal mapping message of encapsulation, and will upgrade the border router that mapping message is routed to territory, mapping server place; If in the IPv4 territory, the mapping server that namely this mobile host is corresponding is positioned at the IPv4 territory to mobile host in mobile anteposition, the order execution in step (26); If in the IPv6 territory, the mapping server that namely this mobile host is corresponding is positioned at the IPv6 territory to mobile host in mobile anteposition, redirect execution in step (27);
(26) border router in mapping server place IPv4 territory will upgrade mapping message in the Intra-site Automatic Tunnel Addressing Protocol mode and send to mapping server; Redirect execution in step (28);
(27) border router in mapping server place IPv6 territory will upgrade mapping message by the standard routing mechanism and send to mapping server;
(28) after mapping server receives and upgrades mapping message and processing, upgrade the home address of mobile host and the map information of ISATAP Care-of Address in local data base; Then, return to the renewal response message for this mobile host according to identical path.
Step 3, mobile host upgrades map information to Correspondent Node: mobile host adopts Intra-site Automatic Tunnel Addressing Protocol technology and standard routing mechanism to upgrade the map information of its home address and described ISATAP Care-of Address to Correspondent Node, so that the packet that Correspondent Node sends can directly send to mobile host.
This step 3 comprises following content of operation:
(31) mobile host utilize the Intra-site Automatic Tunnel Addressing Protocol technology ISATAP interface judgement upgrade mapping message destination address, be whether the address of Correspondent Node is positioned at this territory; If, the order execution in step (32); Otherwise, redirect execution in step (34);
(32) mobile host is directly set up Intra-site Automatic Tunnel Addressing Protocol with Correspondent Node, sends the renewal mapping message to Correspondent Node;
(33) after Correspondent Node receives this message and processing, return to the renewal response message by this direct-connected Intra-site Automatic Tunnel Addressing Protocol of having set up to this mobile host; Finish the operation of this step (3);
(34) mobile host will upgrade in the Intra-site Automatic Tunnel Addressing Protocol mode border router that mapping message sends to territory, mobile rear place;
(35) border router carries out decapsulation after receiving the renewal mapping message of encapsulation, and will upgrade the border router that mapping message is routed to territory, Correspondent Node place; If Correspondent Node is positioned at the IPv4 territory, the order execution in step (36); If Correspondent Node is positioned at the IPv6 territory, redirect execution in step (37);
(36) border router in Correspondent Node place IPv4 territory will upgrade mapping message in the Intra-site Automatic Tunnel Addressing Protocol mode and send to Correspondent Node; Redirect execution in step (38);
(37) border router in Correspondent Node place IPv6 territory will upgrade mapping message by the standard routing mechanism and send to Correspondent Node;
(38) after Correspondent Node receives and upgrades mapping message and confirmation, return to the renewal response message for this mobile host according to identical path.
Step 4 is set up communication link, and realize conversation: after completing above-mentioned steps, mobile host just can continue to carry out session with Correspondent Node, and communication process is front identical with host mobility.
The present invention has carried out repeatedly implementing test, and the below briefly introduces map information renewal process in test:
The present invention not only is supported in IPv4 and IPv6 under conventional TCP/IP network framework and mixes host mobility in scene (as Fig. 5, Fig. 6 and shown in Figure 7), also be supported under the network architecture that ID/Locator separates (as shown in figure 14), IPv4 and IPv6 mix the host mobility in scene.
The network architecture that novel ID/Locator separates is to have inserted new protocol hierarchy-Host Identity layer (Host Identity Layer) between the transport layer of current network and network layer.Host Identity is used for host identities is identified, and in transport layer and application layer, all IP address is all by HIT(Host Identity Tag) replace, no matter how the position of main frame in network changes, and HIT can not change.The IP address no longer is used for the tag communications both sides, and only plays the effect of main frame location, route data in network layer.
Below in conjunction with scene shown in Figure 14, illustrate that in the network environment of the transition stage under the network system framework that ID/Locator separates, the inventive method is supported the course of work of host mobility.
Referring to Figure 14, main frame 1 initial place is in a pure IPv4 territory LD1, main frame 2 and ID/Locator mapping server all are in pure IPv6 territory LD2, main frame 2 and ID/Locator mapping server can utilize the neighbours of IPv6 to find and the automatic configuration mechanism in address forms overall routable IPv6 address, the i.e. Locator of main frame 2.When two main frames will communicate, main frame 1 will use Intra-site Automatic Tunnel Addressing Protocol, and main frame 1 need to first form an ISATAP address, the i.e. Locator of main frame 1.Detailed process is as follows:
(1) after main frame 1 start, first the Dynamic Host Configuration Protocol server to this territory sends the DHCP request message.
(2) after the Dynamic Host Configuration Protocol server in LD1 was received request, to the DHCP response message that main frame 1 sends through expansion, this message had been added the address of BR1 and the ID of territory LD1 at newly-increased Option Field.
(3) dhcp client in main frame 1 is resolved the DHCP response message of receiving, except the IPv4 address that obtains oneself, also gets the address of BR1 and the ID of territory LD1.
(4) main frame 1 starts Intra-site Automatic Tunnel Addressing Protocol, has formed the ISATAP link-local address, and main frame 1 utilizes this address and BR1 to set up Intra-site Automatic Tunnel Addressing Protocol.
(5) main frame 1 compares the ID of the territory LD1 of parsing with the local ID that stores, and because being starts first, ID is not stored in this locality, and comparative result is that both are not identical, and explanation will be applied for the ISATAP address prefix to BR1; Relatively, main frame 1 is stored in this locality with the territory ID in LD1 territory.
(6) through with BR1 interconnected router request (RS) message and router advertisement (RA) message after, main frame 1 has obtained the prefix information of ISATAP address, this territory.
(7) main frame 1 utilizes the Intra-site Automatic Tunnel Addressing Protocol technology automatically to form overall routable ISATAP address, the i.e. Locator of main frame 1 in this locality.
Under the network system framework that ID/Locator separates, main frame 1 and main frame 2 are except having the Locator(IP address), also to have, ID(HIT that be used for identify host identities that use in transport layer and application layer), then begin to set up initial communication, this process specifically describes as follows:
(1) main frame 1 and main frame 2 obtain separately ID by offline mode, and namely the user gets the relevant information of ID and this ID to the ID management organization of appointment.
(2) two main frames are registered respectively the map information of ID/Locator to the ID/Locator mapping server.
(3) 1 ID that knows main frame 2 of main frame, thus at high level by ID to main frame 2 initiating communications.Main frame 1 first sends query messages to the ID/Locator mapping server, inquires about the Locator of main frame 2 by the ID of main frame 2.During transmission, main frame 1 will be set up Intra-site Automatic Tunnel Addressing Protocol with BR1 and communicate by letter, and then this query messages is sent to ID/Locator mapping server in LD2 via the standard routing mechanism.
(4) after the ID/Locator mapping server receives the query messages of main frame 1, send response to query message to main frame 1, inform the Locator of main frame 2.After this response to query message was sent to BR1 via the standard routing mechanism, BR1 also will set up Intra-site Automatic Tunnel Addressing Protocol with main frame 1 and communicate by letter.
(5) after main frame 1 obtained the Locator of main frame 2, both sides just can set up communication in network layer.In communication process, utilize all the time Intra-site Automatic Tunnel Addressing Protocol to communicate between main frame 1 and BR1.
Shown in Figure 14, after initial communication was set up, main frame 1 moved in pure IPv4 territory LD3, and the course of work after the movement of the inventive method support is described below:
(6) main frame 1 first carries out Move Detection by the Link State trace routine.
(7) after main frame 1 detected and moves, the Dynamic Host Configuration Protocol server in LD3 sent the DHCP request message.
(8) after the Dynamic Host Configuration Protocol server in LD3 received request, to the DHCP response message that main frame 1 sends through expansion, this message had been added the address of BR3 and the ID of territory LD3 at newly-increased Option Field.
(9) dhcp client in main frame 1 is resolved the DHCP response message of receiving, except getting own new IPv4 address, also gets the address of BR3 and the ID of territory LD3.
(10) main frame 1 starts Intra-site Automatic Tunnel Addressing Protocol, has formed the ISATAP link-local address in the LD3 territory, and main frame 1 utilizes this address and BR3 to set up Intra-site Automatic Tunnel Addressing Protocol.
(11) main frame 1 compares the ID of the territory LD3 that resolves and the territory ID that is stored in local LD1 territory, and comparative result is that both are different, illustrates to have occured to move between the territory; After relatively finishing, main frame 1 is stored in this locality with the territory ID in LD3 territory, replaces the territory ID that is stored in local LD1 territory.
(12) through with BR3 interconnected router request (RS) message and router advertisement (RA) message after, main frame 1 has obtained the prefix information of the ISATAP address of territory LD3.
(13) main frame 1 utilizes the Intra-site Automatic Tunnel Addressing Protocol technology automatically to form new overall routable ISATAP address, the i.e. new Locator of mobile aft engine 1 in this locality.
(14) after the Locator of main frame 1 changes, first to upgrade to the ID/Locator mapping server map information of the ID/Locator of oneself, after the ID/Locator mapping server receives and operates and completes, with the message that returns to main frame 1 and be updated successfully.In this process, communicating by letter between main frame 1 and BR3 is to utilize all the time Intra-site Automatic Tunnel Addressing Protocol.
(15) except the map information of the ID/Locator that upgrades oneself to the ID/Locator mapping server, main frame 1 also will send updating message to main frame 2, variation has occured in the Locator of notice main frame 2 oneself, after main frame 2 is received this message, sends the renewal acknowledge message to main frame 1.In this process, utilize all the time Intra-site Automatic Tunnel Addressing Protocol to communicate by letter between main frame 1 and BR3.
(16) complete above-mentioned renewal after, before main frame 1 continues it and moves with the communicating by letter of main frame 2, because of in moving process, main frame 1 does not all change with the ID of main frame 2, so ID/Locator separated network framework has guaranteed the high level in the moving process and has connected constantly, just adopted new Locator and main frame 2 to communicate at network layer host 1.
In a word, the embodiments of the invention test is successfully, has realized goal of the invention.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (8)
1. a network system of supporting host mobility under IPv4 and IPv6 hybrid network environment, be provided with dynamic host configuration protocol DHCP server, main frame and border router; It is characterized in that: mix the mobility of scene in order to support IPv4 and IPv6, this system has all expanded functional module to Dynamic Host Configuration Protocol server and main frame, and sets up mapping server; Wherein,
Dynamic Host Configuration Protocol server, be positioned at pure IPv4 territory, be used for to host assignment IPv4 address, the pure IPv4 domain identifier ID that records the main frame place and the address of this domain border router, and these information added in the DHCP response message of newly-increased Option Field, send to main frame; During the new IPv4 address of the newly-increased Option Field of the described DHCP response message Dynamic Host Configuration Protocol server application in territory, place that is mobile host after mobile, the field that Dynamic Host Configuration Protocol server adds in the DHCP response message of replying, be used for informing the address of the border router in the ID in main frame this territory and this territory, so that after in host mobility to pure IPv4 territory, can the new Intra-site Automatic Tunnel Addressing Protocol address prefix of automatic acquisition;
Main frame is two stack main frames of supporting simultaneously IPv4 agreement and IPv6 agreement, have the ISATAP interface and can use Intra-site Automatic Tunnel Addressing Protocol to complete to communicate by letter; This main frame support chain line state measuring ability is to detect the mobile behavior of main frame; This main frame is also supported dhcp client, and expand the function of traditional dhcp client, after receiving the DHCP response message of described newly-increased Option Field, except resolving newly assigned IPv4 address information, also resolve this field, with the ID that obtains the territory, place and the address of border router thereof, then the comparison domain id field judge occur to move between the territory or the territory in mobile, in order to carry out the operation of the follow-up ISATAP of formation Care-of Address; This main frame is after moving and form new address, send map updating message to mapping server and Correspondent Node, upgrading oneself mobile forward and backward home address and the map information of ISATAP Care-of Address, and process the renewal response message that mapping server and Correspondent Node return;
Mapping server is provided with three modules: map information reception/sending module, map information memory management module and map information enquiry module; Be provided with a mapping server in each territory, be responsible for safeguarding the home address of the mobile host that belongs to this territory before moving and the map information of ISATAP Care-of Address; The mapping server that is positioned at pure IPv4 territory is the two stack main frames that have the ISATAP interface, support Intra-site Automatic Tunnel Addressing Protocol, is positioned at the mapping server support IPv6 agreement in pure IPv6 territory;
Border router lays respectively at the edge in pure IPv4 territory or pure IPv6 territory, is the dual-stacker router of supporting ISATAP.
2. system according to claim 1, it is characterized in that: the form of the newly-increased Option Field of described DHCP response message comprises 4 part: type Type, length L ength, domain identifier Domain ID and border router address Edge Router Addresses, wherein
Type Type is the sign of this newly-increased Option Field, mixed with character by specific numeral, character or numeral and consist of, for the address that illustrates that this field store content is domain identifier and border router, so that main frame can find this field fast, clearly after receiving the DHCP response message;
Length L ength is the length of this Option Field;
Domain identifier Domain ID is the ID in territory, is used for distinguishing different territories; When main frame moves, do not need again to obtain the Intra-site Automatic Tunnel Addressing Protocol address prefix in the territory; But when moving between the territory, different because of the Intra-site Automatic Tunnel Addressing Protocol address prefix in each IPv4 territory, mobile host will obtain new Intra-site Automatic Tunnel Addressing Protocol address prefix to border router, therefore newly-increased this Option Field; In same IPv4 territory, this field contents of different Dynamic Host Configuration Protocol server is identical, and this field contents of the Dynamic Host Configuration Protocol server in different IP v4 territory is different;
Border router address Edge Router Addresses is the IPv4 address of border router, because the border router in this territory may not only have 1, the address of this field is one or more.
3. system according to claim 1, it is characterized in that: described Dynamic Host Configuration Protocol server is in order to complete its expanded function, except existing DHCP request message reception/processing module, the IPv4 address information arranges module and DHCP response message sending module, increase again a module newly: territory ID and border router information are stored and module are set, be responsible for the ID in territory, Dynamic Host Configuration Protocol server place and border router address are stored in this Dynamic Host Configuration Protocol server, and be arranged at newly-increased Option Field in the DHCP response message.
4. system according to claim 1, it is characterized in that: whether described main frame is moved in order to detect oneself, in order to obtain the address of ID and the border router in territory, form overall routable Intra-site Automatic Tunnel Addressing Protocol address, and send map updating message to mapping server and Correspondent Node respectively, newly-increased following five modules: the Link State detection module, newly add field parsing module, territory ID relatively and memory module, address, global I SATAP tunnel form module, upgrade map information sending/receiving module; Wherein
The Link State detection module, whether the connection of responsible monitoring host link is moved to judge this main frame; If movement has occured, trigger this main frame and send the DHCP request message;
The new field parsing module that adds is responsible for resolving newly-increased Option Field in the DHCP response message, obtains the ID in territory, the current place of main frame and the address of border router;
Territory ID comparison and memory module are responsible for resolving new territory ID that the DHCP response message obtains and are compared with the territory ID that is stored in main frame this locality, the judgement main frame be occur to move in the territory or the territory between move; If both are identical, illustrate that main frame is mobile in the territory, need not change the territory ID that is stored in main frame this locality; If both are different, illustrate that main frame is to move between the territory, the territory ID that needs to be stored in main frame this locality changes to and resolves the new territory ID that obtains;
Address, global I SATAP tunnel forms module, is used for forming address, global I SATAP tunnel according to the comparative result of ID comparison in territory with memory module; If mobile in the territory, directly form address, global I SATAP tunnel in this locality; If move between the territory, first to the new Intra-site Automatic Tunnel Addressing Protocol address prefix of border router application, form again address, global I SATAP tunnel in this locality after obtaining this prefix;
Upgrade map information sending/receiving module, be responsible for structure and send upgrading mapping message, send to respectively mapping server and Correspondent Node, and receive and process the renewal response message that mapping server and Correspondent Node return.
5. system according to claim 1, it is characterized in that: the function of three modules of described mapping server is respectively:
Map information reception/sending module is responsible for the renewal mapping message of Receiving Host, and constructs and send and upgrade response message to main frame;
The map information memory management module, the one or more map information storage of being responsible for each main frame that will receive be maintained in local data base, and this map information is that two length are the mapping between the address of 128;
The map information enquiry module is responsible for querying mapping information from the local data base of Storage Mapping information, and the result that will inquire about returns to map information reception/sending module and processes.
6. method of work of supporting the network system of host mobility under IPv4 and IPv6 hybrid network environment, described host mobility comprises two kinds: move in the territory of the place migration of main frame in same border router compass of competency, and main frame moves in the border router compass of competency between territory in another border router compass of competency and moves; It is characterized in that: described method comprises following operating procedure:
The mobile detection and the formation of new address of (1) carrying out after host mobility: main frame adopts link state detection method to judge whether oneself is moved; If movement has occured, this mobile host sends the DHCP request message to Dynamic Host Configuration Protocol server immediately, then this mobile host is resolved relevant information from the expansion DHCP response message of replying, and utilizes the Intra-site Automatic Tunnel Addressing Protocol technology to form new address: the ISATAP Care-of Address after mobile;
(2) mobile host upgrades map information to mapping server: mobile host adopts Intra-site Automatic Tunnel Addressing Protocol technology and standard routing mechanism to upgrade the map information of its home address and described ISATAP Care-of Address to mapping server, so that only know that other main frames of this mobile host home address can communicate with; This step comprises following content of operation:
(21) mobile host utilize the Intra-site Automatic Tunnel Addressing Protocol technology ISATAP interface judgement upgrade mapping message destination address, be whether the mapping server address is positioned at this territory; If, the order execution in step (22); Otherwise, redirect execution in step (24);
(22) mobile host is directly set up Intra-site Automatic Tunnel Addressing Protocol with mapping server, sends the renewal mapping message to mapping server;
(23) after mapping server receives this message and processing, upgrade the home address of this mobile host and the map information of ISATAP Care-of Address in local data base; Then, return to the renewal response message by the direct-connected Intra-site Automatic Tunnel Addressing Protocol of having set up to this mobile host; Finish the operation of this step (2);
(24) mobile host will upgrade in the Intra-site Automatic Tunnel Addressing Protocol mode border router that mapping message sends to territory, mobile rear place;
(25) border router carries out decapsulation after receiving the renewal mapping message of encapsulation, and will upgrade the border router that mapping message is routed to territory, mapping server place; If in the IPv4 territory, the mapping server that namely this mobile host is corresponding is positioned at the IPv4 territory to mobile host in mobile anteposition, the order execution in step (26); If in the IPv6 territory, the mapping server that namely this mobile host is corresponding is positioned at the IPv6 territory to mobile host in mobile anteposition, redirect execution in step (27);
(26) border router in mapping server place IPv4 territory will upgrade mapping message in the Intra-site Automatic Tunnel Addressing Protocol mode and send to mapping server; Redirect execution in step (28);
(27) border router in mapping server place IPv6 territory will upgrade mapping message by the standard routing mechanism and send to mapping server;
(28) after mapping server receives and upgrades mapping message and processing, upgrade the home address of mobile host and the map information of ISATAP Care-of Address in local data base; Then, return to the renewal response message for this mobile host according to identical path;
(3) mobile host upgrades map information to Correspondent Node: mobile host adopts Intra-site Automatic Tunnel Addressing Protocol technology and standard routing mechanism to upgrade the map information of its home address and described ISATAP Care-of Address to Correspondent Node, so that the packet that Correspondent Node sends can directly send to mobile host;
(4) set up communication link, realize conversation: after completing above-mentioned steps, mobile host just can continue to carry out session with Correspondent Node, and communication process is front identical with host mobility.
7. method according to claim 6, it is characterized in that: described step (1) further comprises following content of operation:
(11) main frame adopts the method for Link State detection to carry out Move Detection, is used for the connection of monitoring host link, judges whether it is moved; If be moved, trigger main frame and carry out subsequent step (12); Otherwise main frame is not carried out any operation;
(12) mobile host first sends the DHCP request message to the Dynamic Host Configuration Protocol server in territory, mobile rear place, and request distributes a new IPv4 address, and requires reply to inform the sign ID in this territory, main frame place and the address of border router;
(13) after Dynamic Host Configuration Protocol server is received request, the DHCP response message of the expansion of construction complete is replied to mobile host, this response message is added the sign ID in this territory, Dynamic Host Configuration Protocol server place and the address of border router at newly-increased Option Field;
(14) mobile host is resolved the DHCP response message that receives, and gets own new IPv4 address, the sign ID in territory, mobile rear place and the address of this domain border router; Then, this mobile host starts Intra-site Automatic Tunnel Addressing Protocol, forms the ISATAP link-local address in the territory after movement;
(15) the territory ID of mobile host before with the movement of the ID in this territory and its storage compares, if both are identical, is judged as the movement territory in, redirect execution in step (18); If different, be judged as between the territory and move, after first the ID of neofield being stored in this locality, order execution in step (16);
(16) mobile host sends the router solicitation message RS of clean culture to border router by Intra-site Automatic Tunnel Addressing Protocol, after border router receives RS, also return to for this mobile host to comprise the unicast router bulletin RA of the prefix information of ISATAP address, this territory by Intra-site Automatic Tunnel Addressing Protocol;
(17) after mobile host receives RA, parse the prefix information of the ISATAP address in this territory;
(18) mobile host utilizes the Intra-site Automatic Tunnel Addressing Protocol technology automatically to form overall routable ISATAP Care-of Address in this locality.
8. method according to claim 6, it is characterized in that: described step (3) further comprises following content of operation:
(31) mobile host utilize the Intra-site Automatic Tunnel Addressing Protocol technology ISATAP interface judgement upgrade mapping message destination address, be whether the address of Correspondent Node is positioned at this territory; If, the order execution in step (32); Otherwise, redirect execution in step (34);
(32) mobile host is directly set up Intra-site Automatic Tunnel Addressing Protocol with Correspondent Node, sends the renewal mapping message to Correspondent Node;
(33) after Correspondent Node receives this message and processing, return to the renewal response message by this direct-connected Intra-site Automatic Tunnel Addressing Protocol of having set up to this mobile host; Finish the operation of this step (3);
(34) mobile host will upgrade in the Intra-site Automatic Tunnel Addressing Protocol mode border router that mapping message sends to territory, mobile rear place;
(35) border router carries out decapsulation after receiving the renewal mapping message of encapsulation, and will upgrade the border router that mapping message is routed to territory, Correspondent Node place; If Correspondent Node is positioned at the IPv4 territory, the order execution in step (36); If Correspondent Node is positioned at the IPv6 territory, redirect execution in step (37);
(36) border router in Correspondent Node place IPv4 territory will upgrade mapping message in the Intra-site Automatic Tunnel Addressing Protocol mode and send to Correspondent Node; Redirect execution in step (38);
(37) border router in Correspondent Node place IPv6 territory will upgrade mapping message by the standard routing mechanism and send to Correspondent Node;
(38) after Correspondent Node receives and upgrades mapping message and confirmation, return to the renewal response message for this mobile host according to identical path.
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