CN101193130A - Method for penetrating NAT in mobile IPv6 - Google Patents
Method for penetrating NAT in mobile IPv6 Download PDFInfo
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- CN101193130A CN101193130A CNA2006101458718A CN200610145871A CN101193130A CN 101193130 A CN101193130 A CN 101193130A CN A2006101458718 A CNA2006101458718 A CN A2006101458718A CN 200610145871 A CN200610145871 A CN 200610145871A CN 101193130 A CN101193130 A CN 101193130A
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Abstract
The invention discloses a network address translation method in a mobile IPv6 network, which is invented to solve the problem existing in the present technique that the packet communication is terminated after a mobile node is switched into a private network from a public network. The network address translation method in a mobile IPv6 network of the invention comprises the following steps that: the mobile node is switched into the private network from the public network to acquire the care-of address of the private network and send binding update message to a home agent; the network address translation allocates a temporary public network IP address for the mobile node and establishes the mapping of the temporary public network IP address to the private network care-of address after intercepting the binding update message; the mobile node uses the temporary public network IP address to respectively accomplish the binding update with the home agent and the communication nodes in the public network; the mobile node communicates with the communication nodes in the public network through the IPv6 tunnel between the private network care-of address and the network address translation. The invention can maintain the original packet data communication after the mobile node enters the private network from the public network.
Description
Technical field
The present invention relates to the mobile IP v 6 of internet, particularly the method for based traversal network address conversion in the mobile IP v 6.
Background technology
(Internet Engineering Task Force is IETF) in formal mobile IP v 6 (Mobility Support in IPv6, MIPv6) the agreement RFC3775 of proposing of in June, 2004 for the internet engineering task tissue.MIPv6 is that (MobileNode MN) can provide the network layer support by connected reference Internet to mobile node when moving.
The mobile IPv 6 protocol regulation, when MN moves to the another one network from a network, network prefix changes, the Care-of Address of MN (Care of Address, CoA) change thereupon, MN must to home agent (Home Agent, HA) and communication node (Correspondent Node CN) just can carry out proper communication after the new CoA of registration.Because MN normally moves on Internet, mobile IPv 6 protocol can have been realized the mobility of IP layer.But MN not only can move on Internet, also can move into an IPv6 private network from Internet or an IPv6 public network.This moment, the CoA of MN became private net address, can not use on public network, and MN can not rely on CoA and HA and CN to realize binding, and the IP layer of MN and the communication of upper layer application will be forced to cut off.
On the other hand, though the IPv6 network has huge address space in theory, no longer need to be used to alleviate in the IPv4 network address pressure network address translation (Network Address Translator, NAT).But, estimate that the enterprise/office/mechanism that has abundant IPv6 address resource will adopt NAT to separate in-house network and extranets, in the IPv6 in future network so NAT will exist for security considerations such as shielding internal network topological structures.Therefore, MN must solve from the problem that the IPv6 public network moves into IPv6 private network passing through NAT.
So far still there is not solution on this problem.Be numbered in the patent " METHODS AND APPARATUS FOR IMPLEMENTING NAT TRAVERSAL IN MOBILE IP " that US2003123421 proposes by CISCO TECH IND (US) and proposed the scheme that mobile IPv 4 NAT passes through, but it can not be moved to mobile IP v 6 NAT and passes through.Because the core concept of CISCO scheme is Binding Update (the Binding Update that MN is sent by NAT; BU) and the binding acknowledgement (BindingAcknowledgement of HA response; BA) message is directly revised registration and the mobile management of realizing MN; but requirement according to the security protocol RFC3776 (Using IPsec to Protect Mobile IPv6 Signaling Between Mobile Nodes andHome Agents) of mobile IP v 6; any message between MN and the HA must be by ipsec protection, and NAT can not change encrypted IP option head.
Summary of the invention
For defective and the deficiency that overcomes prior art, the object of the present invention is to provide the method for based traversal network address conversion in a kind of mobile IP v 6, can make mobile node when the conversion of public network based traversal network address enters private network, can keep original block data communication.
In order to achieve the above object, the method for based traversal network address conversion in a kind of mobile IP v 6 of the present invention may further comprise the steps:
(1) mobile node enters private network by public network, and the Care-of Address that obtains private network sends binding update messages to home agent;
(2) after network address translation is intercepted and captured this binding update messages, distribute interim public network IP address, and set up of the mapping of interim public network IP address to the private network Care-of Address to mobile node;
(3) mobile node uses the interim public network IP address of network address translation distribution to finish Binding Update with the communication node of home agent, public network respectively;
(4) mobile node communicates through the IPv6 tunnel between private network Care-of Address and network address translation and the communication node of public network.
Preferably, described step (2) is specially:
(21) network address translation is intercepted and captured this binding update messages, judges by source address, destination address and the home address of this binding message whether this mobile node enters private network from public network, if judged result is for being then to enter step (21); If judged result is for denying then step end;
(22) network address translation determines to distribute interim public network IP address to this mobile node, and sets up the mapping of interim public network IP address to the private network Care-of Address.
Preferably, described step (3) is specially:
(31) after mobile node is received this interim public network IP address, use this interim public network IP address and home agent to carry out cipher key change and consult;
(32) after consulting successfully, mobile node is registered to the binding update messages that home agent sends interim public network IP address, finishes the Binding Update with home agent;
(33) mobile node uses the communication node in interim public network IP address and the public network to finish Binding Update.
Preferably, described step (32) is specially:
(321) after consulting successfully, mobile node is given network address translation according to interim public network IP address structure binding update messages;
(322) after network address translation is carried out the tunnel decapsulation to binding update messages, the Binding Update state information of record mobile node, and the Binding Update after the decapsulation is transmitted to home agent registers;
(323) after home agent succeeds in registration, return binding acknowledgement message to network address translation;
(324) network address translation is upgraded after should the Binding Update state information of mobile node, binding acknowledgement message is carried out tunnel encapsulation, and transmit binding acknowledgement and give mobile node.
Preferably, described step (33) is specially:
(331) mobile node is given network address translation according to interim public network IP address structure binding update messages;
(332) after network address translation is carried out the tunnel decapsulation to binding update messages, the Binding Update state information of record mobile node, and the communication node that the Binding Update after the decapsulation is transmitted to public network registered;
(333) after communication node succeeds in registration, return binding acknowledgement message to network address translation;
(334) network address translation is upgraded after should the Binding Update state information of mobile node, binding acknowledgement message is carried out tunnel encapsulation, and transmit binding acknowledgement and give mobile node.
Preferably, also comprise after the described step (4):
(5) after the communication node in mobile node use private network Care-of Address and the private network was finished Binding Update, the communication node of mobile node and private network directly communicated in private network.
Preferably, also comprise after the described step (5):
(6) when the interim public network IP address term of validity finishes, network address translation is selected to regain or is continued to use former interim public network IP address, if select to regain, then step finishes; If select to continue to use, then return step (2).
Preferably, decision described in the step (22) distributes the method for interim public network IP address to be for this mobile node: by the authentication of mobile node or the authentication information that is buffered on the network address translation are decided.
After adopting above-mentioned method, after mobile node enters private network from public network, by network address translation to mobile node distribute interim public network IP address finish with home agent and public network in the registration binding of communication node, can keep original block data communication, mobile node can not be subjected to the obstruction of the network address because of the mobility of IP, causes the mobile node and the packet communication in the external world to be terminated.
Description of drawings
Fig. 1 is a schematic network structure of the present invention;
Fig. 2 is the switching flow figure of mobile node based traversal network address conversion among the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, comprise home agent among the present invention, communication node, the IPv6 public network, the IPv6 private network, intermet, the public network couple in router, the private network couple in router, public network COA, private network COA and network address translation NAT, when mobile node MN enters private network first from public network, obtain private network CoA, mobile node MN is attempted with private network CoA and home agent HA Binding Update, but when arriving network address translation NAT, Binding Update BU message intercepted and captured, network address translation NAT distributes an interim public network IP address to mobile node MN, and create of the mapping of the interim public network IP address of mobile node MN to the private network CoA address of mobile node MN, mobile node MN is used interim public network IP address that network address translation NAT distributes and HA and public network CN instead and is finished Binding Update, afterwards, mobile node MN will be through the forwarding in IPv6 tunnel between private network CoA and network address translation NAT with communicating by letter of public network.
Mobile node MN is connected on the public network by wired or wireless mode at first, is moved then to enter certain private network, will obtain a Care-of Address CoA according to RFC3775.No matter be by the configuration of stateless automatic address, still the state automatic address that has by privately owned DHCP disposes, and this CoA is a private net address.But mobile node MN is not recognized and is entered private network, and still the regulation according to RFC3775 is that Care-of Address sends Binding Update BU to home agent HA with this CoA.When arriving NAT, intercepted and captured Binding Update BU, NAT is by the preceding information such as IP Destination Header of ESP Header in source IP address in the BU message and the BU message, the MN that finds transmission BU is the mobile node that moves into private network from public network, and decision distributes an interim public network IP address to MN.Need to prove that this decision of NAT is based on the authentication to MN, or be buffered in the authentication information on the NAT.There is multiple authentication method can supply to select the AAA that carries out such as cooperating etc. for use with mobile node MN home network aaa server.Network address translation NAT distributes an interim public network IP address to mobile node MN, and creates the mapping of the interim public network IP address of mobile node MN to MN private network CoA address.After mobile node MN is received interim public network IP address, carry out ike negotiation with interim public network IP address and HA, again send to the BU of interim public network IP address after consulting successfully to HA, return BA after HA succeeds in registration, NAT record binding state information when BA and BU message turnover private network.After binding successfully with HA, MN binds according to the CN on mobile IP v 6 standard and the public network.Afterwards, MN carries out proper communication with regard to HA on available interim public network IP address and the public network and CN.MN uses interim public network IP address and the extraneous any IPv6 tunnel of communicating by letter between necessary process MN CoA and the NAT that carries out.
Wherein, interim public network IP address has certain term of validity.When the term of validity finished, NAT can select to continue to provide and still regain the interim public network IP address of distributing to MN.If select to continue to provide interim public network IP address, it is to continue to use the original interim public network IP address that distributes that NAT can also select, still distribute to the interim public network IP address of mobile node according to certain policy dynamic change, hide with the position of realizing mobile node.Mobile node also can be initiatively to NAT request public network IP address when the term of validity finished.
In order to optimize the message transmissions path, mobile node MN can also be used the CN Binding Update in private network CoA and the private network, and mobile node MN can directly be carried out in private network with communicating by letter of private network CN like this, needn't pass through network address translation NAT.
As shown in Figure 2, the switching flow for mobile node based traversal network address conversion of the present invention comprises: MN, AR, NAT, HA and home network, CN; The present invention specifically may further comprise the steps:
(201) MN moves into private network, and receives the router advertisement message 1.RA that private network couple in router AR (Access Router, couple in router) sends;
(202) detect the IP layer and move, carry out stateless and dispose Care-of Address CoA of acquisition automatically, this address is a private net address;
(203) MN constructs 2. Binding Updates (CoA) and sends to HA and carry out Binding Update, and the AR of MN is forwarded to NAT after receiving 2. Binding Updates, can transmit through a plurality of routers in the way.Wherein, the form of binding update messages is as shown in table 1 below, wherein source address is CoA, destination address is HA, the home address option is HoA (the Home Address of MN in the purpose option head, home address), ESP uses original SA (Security Association, security association) that consults that slip-on head is encrypted.
| IPv6 header(source＝care-of address Destination＝home agent) |
| Destination Options header Home Address option(home address) |
| ESP header(SPI) |
| Mobility header Binding Update |
Table 1
(204) after NAT receives Binding Update BU, judge that the MN that sends BU is from public network, so decision distributes an interim public network IP for MN, but before distributing, NAT authenticates according to the home network of information such as the IP address of HoA among the BU and HA with MN earlier, and after authentication was passed through, NAT was interim public network IP of MN distribution according to certain strategy, and stipulate the term of validity of this address, and set up the mapping relations of interim public network IP and MN CoA.
(205) NAT structure 3. interim public network IP send to MN, behind the forwarding arrival MN of 3. interim public network IP through AR, and the interim public network IP address that carries in the MN configuration messages, and carry out IKE (interchange key) with interim public network IP address and HA and consult to obtain new SA.
(206) MN constructs 4. Binding Updates (public network IP) then and sends to HA, and through the forwarding arrival NAT of AR, wherein, the form of binding update messages is as shown in table 2 below, is carrying out the IPv6 tunnel encapsulation one time on normal BU message format.Source address among the normal BU is any public affairs/private net address except that interim public network IP, is determined by MN; Destination address is HA; The home address option is the HoA of MN in the purpose option head; Alternate Care-of Address option head in the slip-on head is interim public network IP; ESP uses the new SA that consults that slip-on head is encrypted.The source address of tunnel encapsulation part is CoA, and destination address is NAT.
| IPv6header(source＝care-of address Destination＝NAT) |
| IPv6header(source！＝temporary public IP Destination＝home agent) |
| Destination Options header Home Address option(home address) |
| ESP header(SPI) |
| Mobility header Binding Update |
| Alternate Care-of-Address＝temporary public IP |
Table 2
(207) after NAT receives 4. Binding Updates, it is carried out the tunnel decapsulation, write down the Binding Update state information of MN, the Binding Update bag after the decapsulation is transmitted to the HA of MN, for source address after the decapsulation is the BU of private net address, and NAT transfers it to public network address and transmits.Return binding acknowledgement after HA succeeds in registration, NAT upgrades corresponding MN Binding Update state information.
(208) NAT carries out the IPv6 tunnel encapsulation to binding acknowledgement message, NAT transmits 5. binding acknowledgements and gives MN then, the source address of binding acknowledgement message is HA, and destination address is the Care-of Address of MN public network, i.e. AlternateCare-of Address in the Binding Update: interim public network IP.
(209) MN receives after 5. binding acknowledgements, with the CN Binding Update in interim public network IP and the public network, comprising RRT (Return Routability Procedure, but return routing procedure).Similarly, NAT keeps the Binding Update state of MN and CN, and the packet that sends with MN to the MN transmission in this process is carried out IPv6 tunnel encapsulation/decapsulation.
After the Binding Update of HA and CN was finished, MN just can normally carry out with extraneous communicating by letter, and NAT will carry out encapsulation/decapsulation to MN with extraneous communication packet according to the MN Binding Update information of buffer memory.When the MN switching that is moved in NAT inside, when HA and CN Binding Update, NAT will directly return the binding successful information to MN, and no longer transmit Binding Update according to the MN Binding Update information of buffer memory.
The present invention is in moving from the public network to the private network, by network address translation to mobile node distribute interim public network IP address finish with home agent and public network in the registration binding of communication node, can keep original block data communication, mobile node can not be subjected to the obstruction of the network address because of the mobility of IP, causes the mobile node and the packet communication in the external world to be terminated.And MN moves when switching in private network inside, interim public network IP address can not change thereupon, therefore needn't pass through process to the HA and the CN Binding Update of public network, and this process may be quite consuming time, therefore the present invention can accelerate the switch speed that MN moves significantly in private network, satisfies the requirement of real time communication better.
Claims (8)
1. the method for based traversal network address conversion in the mobile IP v 6 is characterized in that, may further comprise the steps:
(1) mobile node enters private network by public network, and the Care-of Address that obtains private network sends binding update messages to home agent;
(2) after network address translation is intercepted and captured this binding update messages, distribute interim public network IP address, and set up of the mapping of interim public network IP address to the private network Care-of Address to mobile node;
(3) mobile node uses the interim public network IP address of network address translation distribution to finish Binding Update with the communication node of home agent, public network respectively;
(4) mobile node communicates through the IPv6 tunnel between private network Care-of Address and network address translation and the communication node of public network.
2. according to the method for based traversal network address conversion in the described mobile IP v 6 of claim 1, it is characterized in that described step (2) is specially:
(21) network address translation is intercepted and captured this binding update messages, judges by source address, destination address and the home address of this binding message whether this mobile node enters private network from public network, if judged result is for being then to enter step (21); If judged result is for denying then step end;
(22) network address translation determines to distribute interim public network IP address to this mobile node, and sets up the mapping of interim public network IP address to the private network Care-of Address.
3. according to the method for based traversal network address conversion in the described mobile IP v 6 of claim 2, it is characterized in that described step (3) is specially:
(31) after mobile node is received this interim public network IP address, use this interim public network IP address and home agent to carry out cipher key change and consult;
(32) after consulting successfully, mobile node is registered to the binding update messages that home agent sends interim public network IP address, finishes the Binding Update with home agent;
(33) mobile node uses the communication node in interim public network IP address and the public network to finish Binding Update.
4. according to the method for based traversal network address conversion in the described mobile IP v 6 of claim 3, it is characterized in that described step (32) is specially:
(321) after consulting successfully, mobile node is given network address translation according to interim public network IP address structure binding update messages;
(322) after network address translation is carried out the tunnel decapsulation to binding update messages, the Binding Update state information of record mobile node, and the Binding Update after the decapsulation is transmitted to home agent registers;
(323) after home agent succeeds in registration, return binding acknowledgement message to network address translation;
(324) network address translation is upgraded after should the Binding Update state information of mobile node, binding acknowledgement message is carried out tunnel encapsulation, and transmit binding acknowledgement and give mobile node.
5. according to the method for based traversal network address conversion in the described mobile IP v 6 of claim 3, it is characterized in that described step (33) is specially:
(331) mobile node is given network address translation according to interim public network IP address structure binding update messages;
(332) after network address translation is carried out the tunnel decapsulation to binding update messages, the Binding Update state information of record mobile node, and the communication node that the Binding Update after the decapsulation is transmitted to public network registered;
(333) after communication node succeeds in registration, return binding acknowledgement message to network address translation;
(334) network address translation is upgraded after should the Binding Update state information of mobile node, binding acknowledgement message is carried out tunnel encapsulation, and transmit binding acknowledgement and give mobile node.
6. according to the method for based traversal network address conversion in the described mobile IP v 6 of claim 1, it is characterized in that described step also comprises after (4):
(5) after the communication node in mobile node use private network Care-of Address and the private network was finished Binding Update, the communication node of mobile node and private network directly communicated in private network.
7. according to the method for based traversal network address conversion in the described mobile IP v 6 of claim 6, it is characterized in that described step also comprises after (5):
(6) when the interim public network IP address term of validity finishes, network address translation is selected to regain or is continued to use former interim public network IP address, if select to regain, then step finishes; If select to continue to use, then return step (2).
8. according to the method for based traversal network address conversion in the described mobile IP v 6 of claim 2, it is characterized in that decision described in the step (22) distributes the method for interim public network IP address to be for this mobile node: by the authentication of mobile node or the authentication information that is buffered on the network address translation are decided.
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