CN100438682C - Method of dynamic allocating home address remotely for mobile IPv6 node - Google Patents
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Abstract
The present invention discloses a method of the remote dynamic configuration of a home address of a mobile IPv6 node, which comprises the following procedures: a mobile IPv6 node is connected to an access position to obtain a forwarding address; a home agent address is obtained; a home address is obtained; then the obtained home address and the forwarding address are bound and registered; when the forwarding address is changed, the binding is updated. When the mobile IPv6 node is not on a home link, the requirements for the remote dynamic initialization of a home address and the acquirement of certification authority can be realized by applying the method provided by the present invention. The present invention also realizes the switch of the remote dynamic home address of the mobile IPv6 node, optimizes routes, raises the communication efficiency during roaming across regions, and reduces roaming cost. The present invention also realizes the user mobility irrelevant to terminal hardware.
Description
Technical field
The present invention relates to mobile IP (Internet Protocol) technology, particularly a kind of method of mobile IPv 6 node Remote Dynamic configuration home address.
Background technology
In current mobile IPv 4 (Mobile Internet Protocol Version 4) and mobile IP v 6 (MobileInternet Protocol version 6), home address is the permanent clean culture routable address of mobile node, and promptly the home link of mobile node and home address are permanent and fixing.Have only home link when mobile node to have under the situation that a plurality of IP subnet prefixs or IP subnet prefix initiatively change, home address is just vicissitudinous may.
After mobile node leaves the local, on purpose all at first mail to the home link of mobile node for the message of moving nodes local address, again with this message redirecting to Care-of Address.Even under IPv6 routing optimality pattern, the message at communication initial stage all is to mail to home link earlier.In actual applications, the life cycle of most communication sessions is all of short duration relatively.In general, the access point of mobile node and moving range are relatively-stationary stage by stage, and the mobile node that always is in constant the moving is considerably less, particularly to continue the mobile node that moves on a large scale considerably less especially, if so adopt the home link and the home address of permanent fixation, can cause the very big and reduction networks efficiency of expense of signaling exchange, and user's wandering fee is also very high, is unfavorable for the expansion of operator.
For reducing cross-domain mutual expense of mobile IP signaling and time-delay, present layered mobile IPv 6 (HMIPv6) technology has been introduced the notion of couple in router, mobile anchor point, regional care-of address, layered mobile IPv 6 node, on-link care-of address and local Binding Update.Figure 1 shows that mobile node moves schematic diagram in the HMIPv6 technology.The HMIPv6 technology moves to the part that home agent and communication node have been hidden mobile node, thereby makes signaling process localizations such as Binding Update, has reduced the signaling consumption of Binding Update between the territory.In the HMIPv6 technology, mobile IP network is divided into one by one mobile administrative domain according to network topology, each territory is managed by one or more mobile anchor point, and mobile anchor point is as a local home agent of mobile node.When mobile node was mobile in the territory that a mobile anchor point is managed, it had two Care-of Address, was respectively regional care-of address (RCoA) and on-link care-of address (LCoA).Mobile node has different LCoA in different wireless access routers (AR) subnet, but needs only mobile node in the management domain of same mobile anchor point, and the RCoA of this mobile node is constant.Like this, when mobile node is mobile in this territory, only need send the binding update messages between LCoA and the RCoA to the mobile anchor point in this territory.And for home agent and communication node, mobile node is still communicated by letter with them with constant RCoA.Mobile anchor point is intercepted and captured the message of issuing mobile node from communication node and home agent, and finds the current LCoA of mobile node according to RCoA from localized binding message, delivers message then and gives mobile node.Have only when mobile node switches between different mobile anchor point management domains, just need be to the binding update messages of home agent and communication node transmission home address and RCoA.
In the HMIPv6 technology, on purpose for the message of moving nodes local address still will mail to home agent earlier, be redirected to mobile anchor point again, and then be redirected to the foreign link couple in router, be transmitted to mobile node at last.And because communication node is the home address that constantly changes and only remember in advance mobile node, so even the message at communication initial stage all is to issue home agent earlier under IPv6 routing optimality pattern.The HMIPv6 technology has still been supposed the permanent and stationarity of the home address and the home agent of mobile node.In fact, customer requirements keeps ratio that the unbroken demand of session accounts for total traffic capacity seldom in cross-domain move, and cross-domain when mobile, much people but can communication close equipment.So the signaling consumption that the HMIPv6 technology is saved is far smaller than the complexity that it is introduced.
Simultaneously, in current mobile IPv 4 and mobile IP v 6, do not relate to, but suppose that mobile node once was connected on the home link, and static state has obtained home address configuration and use authority home address and the ambulant initialization of mobile node.Mobile node is assumed to be authorizes to forever having mobility.In actual applications, when staying out township's link, mobile node may have the demand that Remote Dynamic obtains the home address configuration and authorizes.For example: mobile IPv 6 node may have the demand with IPv6 network service in the IPv4 Access Network time; When disposing centralized home agent, not necessarily all mobile IPv 6 nodes all are connected on the home link, need dynamically to generate home address and access authentication and mandate this moment; Mobile IPv 6 node should be closed in the user uses or be started roaming function temporarily, not necessarily forever needs to open roaming support.
Summary of the invention
In view of this, main purpose of the present invention is the method that proposes a kind of dynamic-configuration home address, in the time of on mobile node is stayed out township's link, and Remote Dynamic initialization home address and access authentication mandate.
For achieving the above object, technical scheme of the present invention is such:
A kind of method of mobile IPv 6 node Remote Dynamic configuration home address may further comprise the steps:
A, mobile IPv 6 node carry out access authentication on current access ground, and obtain Care-of Address;
B, described mobile IPv 6 node by access authentication authorization messages or obtain the address of home agent by active inquiry, according to the selected home agent in the address of the home agent that is obtained;
C, described mobile IPv 6 node obtain home address by home agent;
D, described mobile IPv 6 node carry out binding registration with home address and the Care-of Address that obtains to home agent;
If the E Care-of Address changes, then mobile node carries out Binding Update to home agent.
Described steps A further comprises, mobile IPv 6 node inserts sign and terminal interface with user network and identifies and send to access server and carry out access authentication behind current access ground access network.
The described acquisition Care-of Address of steps A is: configuration obtains Care-of Address or obtains Care-of Address by the DHCP agreement automatically.
Comprise further between step B and the C that user network is inserted sign to mobile node and the terminal interface sign sends to home agent with the authentication of request local.
Take a step forward in steps A and may further comprise the steps:
A1, to divide IP network by network topology be to be no less than two mobile administrative domain, wherein each described mobile administrative domain includes an IP subnet at least, have in each described mobile administrative domain and be no less than one home agent, in mobile management system, store the user profile that helps mobile management, and specify the home agent of selecting in the time of to roam for the user;
A2, user roam into another mobile administrative domain from a mobile administrative domain.
The home agent of selecting when steps A 1 described appointment can be roamed for the user is specified the home agent of permanent residence for the user, the address of the described acquisition home agent of step B is: obtain the address of first home agent in described user's permanent residence option, or obtain in described user's permanent residence option the address from the home agent of a nearest permanent residence of user.
The described home agent of step C distributes home address to be to described mobile IPv 6 node: home agent distributes and the irrelevant home address of terminal interface sign for mobile IPv 6 node by DHCP mechanism, and perhaps home agent generates the home address of mobile IPv 6 node with terminal interface sign and home agent prefix.
Described home agent is concentrated to be deployed in edge router or to concentrate to be deployed in BAS Broadband Access Server or to distribute and is deployed in couple in router.
As can be seen from the above technical solutions, mobile IPv 6 node carries out access authentication among the present invention when powering on the back access network, after access authentication passes through, at first obtain the Care-of Address of roaming place, obtaining appointing of home agent then broadcasts address or unicast address, obtain home address by the local Certificate Authority again, and with home address and Care-of Address binding registration, and when Care-of Address changes, carry out Binding Update.The demand of Remote Dynamic initialization home address and access authentication mandate when therefore the present invention has realized on mobile IPv 6 node is stayed out township's link.For example: satisfied when mobile IPv 6 node is believed with IPv6 Netcom the demand of Remote Dynamic initialization home address and access authentication mandate in the IPv4 Access Network; Satisfied when disposing centralized home agent, not necessarily all mobile IPv 6 nodes all are connected on the home link, need dynamically to generate the demand of home address and access authentication and mandate; Satisfy mobile IPv 6 node and in use opened temporarily or closed the demand of roaming function.
Simultaneously, when mobile IPv 6 node moves to new mobile administrative domain, notify the user to roam into new mobile administrative domain and to the local hometown-agent-address of this new mobile administrative domain of user notification or allow the user select the home agent of the permanent residence set, can allow the user select whether to switch on these local home agent, realized the switching of mobile IPv 6 node Remote Dynamic home address, thereby optimized route, the communication efficiency when having improved trans-region roaming has reduced wandering fee.
Simultaneously, the home address of mobile IPv 6 node is at user's distribution rather than at terminal distribution, the network access Identifier of terminal and user are irrelevant or irrelevant with terminal hardware information, user's home address Certificate Authority and terminal hardware information are irrelevant, thereby utilize mobile IP v 6 mechanism, the user is when using the terminal communication of any support mobile IP v 6, other communication node or communication user can find this user by the home address of user's registration, and then have realized and the irrelevant user mobility of terminal hardware.
Description of drawings
Fig. 1 moves schematic diagram for mobile node in the existing HMIPv6 technology.
Fig. 2 be move in the mobile node territory of one embodiment of the invention and the territory between mobile schematic diagram.
Fig. 3 is the flow chart of the Remote Dynamic configuration home address of one embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Main thought of the present invention is that mobile IPv 6 node is when powering on access network, elder generation is at the roaming place access authentication and obtain Care-of Address, obtain hometown-agent-address then and obtain home address by the local Certificate Authority, again with the home address and the Care-of Address binding registration that are obtained, and when changing, Care-of Address carries out Binding Update.
Fig. 2 be move in the territory of one embodiment of the invention and the territory between mobile schematic diagram.As shown in Figure 2, IP network can be divided into some mobile administrative domains according to network topology, wherein each mobile administrative domain contains an IP subnet at least, and each mobile administrative domain comes managing I P mobility by one or more home agent.The function of home agent can be deployed on the edge router (ER) or BAS Broadband Access Server (BAS) in territory, also the function of home agent can be deployed on the couple in router with distributing, does not dispose home agent in core network domain.In order to manage the user profile of mobile IP node, at mobile IP network deploy mobile management system.Roaming function directly be opened or close to mobile node can or at any time by upper layer application such as short message, WWW, voice calls to the business hall.When opening roaming function, the user provides terminal interface sign, user network and inserts sign, permanent residence option (1~N), roaming range (city/inside the province/domestic/whole world) etc. and help the user profile of mobile management, and stores these information at mobile management system.The home agent of selecting when appointment can be roamed for mobile node, the home agent of for example selecting user and provider in terms of service, to reach an agreement, the home agent of selecting when wherein the home agent of permanent residence that can the user is given is as the roaming of confession mobile node.Mobile management system can be with these information according to the moving range differentiated control.
Fig. 3 is the flow chart of one embodiment of the invention Remote Dynamic configuration home address.As shown in Figure 3, may further comprise the steps:
Step 301: mobile IPv 6 node is at current access ground access authentication and obtain Care-of Address.
Mobile IPv 6 node carries out access authentication when powering on the back access network, user network access sign and terminal interface sign are sent to access server acquisition insertion authority, obtains Care-of Address by automatic configuration or DHCP agreement.For mobile IPv 6 node, Care-of Address is the temporary ip address of mobile IPv 6 node, and access server needs and mobile management system carries out the access authentication mandate alternately.
Step 302: mobile IPv 6 node obtains the unicast address of home agent or appoints and broadcast the address.
Select home agent in the home agent that mobile management system can be selected when specified confession mobile node roaming, for example select the home agent of first permanent residence in the permanent residence option of user's appointment, the unicast address of then being broadcast address or this home agent of appointment appointing of selected home agent is carried in the insertion authority message and returns mobile IPv 6 node.Perhaps select in the permanent residence one from the nearest permanent residence X of Care-of Address, then broadcast unicast address that address or one specifies this home agent appointing of selected home agent from the nearest permanent residence X of Care-of Address and be carried in the insertion authority message and return mobile IPv 6 node.Mobile node by access authentication authorization messages or by methods such as active inquiry, can obtain appointing of home agent to broadcast address or unicast address.If what return to mobile node is to appoint to broadcast the address, mobile node can find that flow process obtains home agents list and selects one of them home agent by carrying out hometown-agent-address.
Step 303: obtain home address by the local Certificate Authority.
Create security association between mobile IPv 6 node and the selected home agent, carry out local Certificate Authority process then.After creating security association between mobile IPv 6 node and the selected home agent, user network is inserted sign to mobile IPv 6 node and the terminal interface sign sends to home agent with authentication of request local and home address, and home agent and mobile management system carry out the local authentication and authorization alternately.After the local authentication is passed through, home agent can be that mobile IPv 6 node distributes a home address that has nothing to do with the terminal interface sign with DHCP mechanism, perhaps generate the home address of mobile IPv 6 node, the home address that generates is carried in the authorization messages of local returns to mobile IPv 6 node then with terminal interface sign and home agent prefix.
Step 304: home address and Care-of Address binding registration.
Mobile IPv 6 node configuration home address sends " Binding Update " message to home agent then and realizes binding registration.
Step 305: Care-of Address carries out Binding Update when changing.
When mobile IPv 6 node was mobile in a mobile administrative domain, if variation has taken place Care-of Address, then mobile IPv 6 node carried out Binding Update to home agent transmission " Binding Update " message at once.
Based on above mobile IPv 6 node Remote Dynamic home address collocation method, carry out Binding Update when changing and to realize the roaming of mobile IPv 6 node in a mobile administrative domain by Care-of Address.Equally, based on above mobile IPv 6 node Remote Dynamic home address collocation method, when mobile IPv 6 node moves to new mobile administrative domain, mobile IPv 6 node can also dynamically switch oneself home link and home address, and this moment, the implication of home address just developed into " mobile node is at the clean culture routable address of a period of time internal fixation ".
When mobile IPv 6 node moves to new mobile administrative domain, after the access authentication procedure of step 301, can return from the address of the home agent of the nearest permanent residence of current Care-of Address, this moment, permanent residence was Y, rather than X.Mobile IPv 6 node can be made as the home agent that automatically switches to this permanent residence Y, perhaps points out the user, whether is switched to the home agent of this permanent residence Y again by the manual selection of user.After the access authentication procedure of step 301, also can return the address of the home agent of first permanent residence.For the home address handover event that makes mobile IPv 6 node can in time be notified other communication node on the network, access server, home agent and mobile management system need upgrade DNS clauses and subclauses in the network or LIST SERVER clauses and subclauses etc., so that other communication node can find this mobile IPv 6 node.Simultaneously, cause network burden and confusion for the switching overfrequency that prevents home address, mobile management system can be controlled the shortest time interval of twice switching.
Based on above mobile IPv 6 node Remote Dynamic home address collocation method, also can realize and the irrelevant user mobility of terminal.The user can use the arbitrarily interim terminal of supporting mobile IP v 6, allows other user finds oneself on the network.It is irrelevant that the network access authentication of terminal authorizes the user, and the user supposes that this terminal has been linked in the network when using certain terminal, the perhaps network access authentication mandate of terminal terminal hardware sign such as binding MAC address not, and identifying user identity sign only; Mobile management system is only stored and irrelevant subscriber identity information, some permanent residence options and the roaming range of terminal hardware; The user initiatively initiates inquiry to mobile management system, obtains to appoint from the home agent of the nearest permanent residence of current location to broadcast address or unicast address; Set up Security Association between the terminal of the current use of user and the home agent, carry out local authentication and obtain home address, have nothing to do with terminal hardware and authenticate used information; This home address of configuration sends the binding registration that " Binding Update " message realizes home address and Care-of Address to home agent then on the terminal of current use; Home agent and mobile management system are responsible for upgrading the User Identity in the LIST SERVER and the mapping relations of home address, make other communication node know that this user is online and can find this user.In a word, the home address of mobile IPv 6 node is at user's distribution rather than at terminal distribution.It is irrelevant or irrelevant with terminal hardware information that the network access authentication of terminal authorizes the user, user's local Certificate Authority and terminal hardware information are irrelevant, so, utilize mobile IP v 6 mechanism, when the user communicates in the terminal of using any support mobile IP v 6, other communication node or communication user can find this user by the home address of user's registration, thereby realize and the irrelevant user mobility of terminal hardware, and then make do not have the user of privately owned terminal also can enjoy the mobility and the ubiquitous business of nomadic level.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1, a kind of method of mobile IPv 6 node Remote Dynamic configuration home address is characterized in that, may further comprise the steps:
A, mobile IPv 6 node carry out access authentication on current access ground, and obtain Care-of Address;
B, described mobile IPv 6 node by access authentication authorization messages or obtain the address of home agent by active inquiry, according to the selected home agent in the address of the home agent that is obtained;
C, described mobile IPv 6 node obtain home address by home agent;
D, described mobile IPv 6 node carry out binding registration with home address and the Care-of Address that obtains to home agent;
If the E Care-of Address changes, then mobile node carries out Binding Update to home agent.
2, method according to claim 1 is characterized in that, described steps A further comprises, mobile IPv 6 node inserts sign and terminal interface with user network and identifies and send to access server and carry out access authentication behind current access ground access network.
3, method according to claim 1 and 2 is characterized in that, the described acquisition Care-of Address of steps A is: configuration obtains Care-of Address or obtains Care-of Address by the DHCP agreement automatically.
4, method according to claim 1 is characterized in that, further comprises between step B and the C, and mobile node inserts sign and terminal interface sign with user network and sends to home agent and levy to ask the local to be recognized.
5, method according to claim 1 is characterized in that, taking a step forward in steps A may further comprise the steps:
A1, to divide IP network by network topology be to be no less than two mobile administrative domain, wherein each described mobile administrative domain includes an IP subnet at least, have in each described mobile administrative domain and be no less than one home agent, in mobile management system, store the user profile that helps mobile management, and specify the home agent of selecting in the time of to roam for the user;
A2, user roam into another mobile administrative domain from a mobile administrative domain.
6, method according to claim 5, it is characterized in that, the home agent of selecting when steps A 1 described appointment can be roamed for the user is specified the home agent of permanent residence for the user, the address of the described acquisition home agent of step B is: obtain the address of first home agent in described user's permanent residence option, or obtain in described user's permanent residence option the address from the home agent of a nearest permanent residence of user.
7, method according to claim 1, it is characterized in that, the described home agent of step C distributes home address to be to described mobile IPv 6 node: home agent distributes and the irrelevant home address of terminal interface sign for mobile IPv 6 node by DHCP mechanism, and perhaps home agent generates the home address of mobile IPv 6 node with terminal interface sign and home agent prefix.
8, method according to claim 1 or 5 is characterized in that, described home agent is concentrated to be deployed in edge router or to concentrate to be deployed in BAS Broadband Access Server or to distribute and is deployed in couple in router.
9, method according to claim 1 is characterized in that, the address that mobile IPv 6 node described in the step B obtains home agent comprises:
Described mobile IPv 6 node obtains the unicast address of home agent or appoints and broadcast the address.
10, method according to claim 4 is characterized in that, identifies and also comprises before sending to home agent at described sign and terminal interface that user network is inserted:
Create security association between mobile IPv 6 node and the selected home agent.
11, method according to claim 1 is characterized in that, also comprises after step e:
When mobile IPv 6 node moved to new mobile administrative domain, mobile IPv 6 node obtained Care-of Address at current mobile administrative domain access network, and obtained the address of the home agent of permanent residence; Mobile IPv 6 node switches on the home agent of described permanent residence.
12, method according to claim 11 is characterized in that, the address of the home agent of described acquisition permanent residence is:
Acquisition is from the address of the home agent of a nearest permanent residence of current Care-of Address, or obtains the address of the home agent of described first permanent residence of user.
13, method according to claim 11 is characterized in that, described mobile IPv 6 node also comprises after switching on the home agent of described permanent residence:
Access server, home agent and mobile management system upgrade DNS clauses and subclauses or the LIST SERVER clauses and subclauses in the network.
14, method according to claim 2 is characterized in that:
The user of described access authentication and described mobile IPv 6 node is irrelevant or irrelevant with the hardware information of described mobile IPv 6 node.
15, method according to claim 4 is characterized in that:
The authentication of described local is irrelevant with the hardware information of described mobile IPv 6 node.
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