CN1411231A - Data packet transmission method in mobile IP - Google Patents
Data packet transmission method in mobile IP Download PDFInfo
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- CN1411231A CN1411231A CN02139183A CN02139183A CN1411231A CN 1411231 A CN1411231 A CN 1411231A CN 02139183 A CN02139183 A CN 02139183A CN 02139183 A CN02139183 A CN 02139183A CN 1411231 A CN1411231 A CN 1411231A
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Abstract
This invention discloses a method for a data packet transmission in mobile IP in which this invention uses network addrss conversion to replace original tunnel systemto realize data packet transmission between non-local agent and hometown agentto spread the form of mobile agent discovering message. Hometown agent operates on network address conversion when receiving the said message, and non-local agent adds a network address conversion lift for safeguarding TCP/UDP/ICMP and modifies value of TTL to 255 the same time when operating on network addrss covers to guarantee the data packets will not lose in transmission, increasing data transmission efficiency.
Description
Technical field
The present invention relates to the mobile IP technology in the computer network, specifically, relate to a kind of data package transmission method.
Background technology
Mobile IP technology is a kind of technology that locomotive function is provided on fhe global the Internet, and it makes node still can keep ongoing communication when handoff links.By a kind of IP routing mechanism is provided, mobile node can be connected on any link with a permanent IP address.The topmost application of mobile IP technology at present is gateway GPRS service node (the English breviary: GGSN), packet data serving node (the English breviary: PDSN) of CDMA2000 of 3G (Third Generation) Moblie WCDMA.
Be some terms of correlation technique below:
1) mobile node: can with the position of entering the Internet from a link switchover to another link, and still keep all ongoing communications, and only use those nodes of its home address (network address on original link).
2) Care-of Address: Care-of Address is meant the relevant IP address when mobile node is connected on the foreign link, it can be divided into two kinds, foreign agent care-of address (the IP address of Foreign Agent) and co-located care-of address (temporarily distributing to the IP address of certain port of mobile node).
3) home agent: the router that has a port to link to each other with the moving nodes local link.
When mobile node switched chain, home agent notified mobile node its current location always, and this information is kept in its Care-of Address by mobile node.
Sometimes, home agent is broadcasted the accessibility to the network prefix of moving nodes local address, thereby attracts the IP packet of those home address that are sent to mobile node.
The IP packet of the home address of mobile node is sent in parsing, and these bags are sent on the Care-of Address of mobile node by tunneling technique.
4) Foreign Agent: the router on the foreign link of mobile node.
Help mobile node to notify its its Care-of Address of home agent.
Sometimes, provide the Care-of Address of mobile node, and be the bag of the mobile node that is provided with the tunnel by home agent after send sealing off.
As the default router that is connected the mobile node on the foreign link.
5) tunnel: when in a packet is encapsulated in the payload of another packet, transmitting, the path of process be called the tunnel.
6) session: the message communicating between the network equipment.
7) network address translation: our said network address translation mainly is meant the private network address that adopts for the problem that solves IPv4 address scarcity and the mutual mapping of global address usually, and the conceptive difference to some extent of the network address translation here, be that external host is initiatively initiated to be mapped as external host---〉home agent, home agent with session mobile node---〉session of mobile node, and the session of conversely mobile node being replied external host is mapped as mobile node---〉home agent, home agent---session of external host.Here in fact home agent has served as the function of similar acting server.
8) registration: mobile node is told the rules of home agent the Care-of Address of oneself.
9) GRE: generic route encapsulation (Generic Routing Encapsulation) is a kind of tunneling technique that mobile IP adopts.
Next the working mechanism of the present once mobile IP technology (IETF RFC3220) of our brief analysis:
1) by multicast periodically or broadcast a message that is called agency's broadcasting, the annexation of home agent and Foreign Agent declaration they and link.
2) after mobile node receives that these act on behalf of broadcast, check that content wherein oneself is connected on home link or the foreign link determining.When it was connected on the home link, mobile node just can be worked as stationary nodes, and promptly it no longer utilizes other functions of mobile IP.
We suppose that mobile node has left current link now, and roaming is connected on the foreign link.
3) mobile node that is connected on the foreign link needs a Care-of Address.It can find foreign agent care-of address from acting on behalf of of Foreign Agent broadcasting the broadcast, co-located care-of address must obtain by configuration rules, such as with DHCP (English breviary: DHCP), point-to-point protocol (English breviary: IPCP PPP) or manual configuration.
4) mobile node is registered the Care-of Address that obtains to home agent from the 3rd step.In registration process, if a Foreign Agent is arranged on the link, mobile node is just to its request service.For stoping Denial of Service attack, registration message requires to authenticate.
5) home agent or the some other router broadcast on home link are to the accessibility of the network prefix of moving nodes local address, thereby attract to mail to the packet of moving nodes local address, home agent intercepts this bag, and, send packet to mobile node in the 4th step by the tunnel according to the Care-of Address that mobile node is registered.
6) at the Care-of Address place (may be a port of Foreign Agent or mobile node), raw data packets is extracted from the tunnel gives mobile node.
7) opposite, the packet that is sent by mobile node directly is routed on the destination node, need not tunneling technique (for some application, as fire compartment wall, needing to consider reverse tunnel, promptly with the similar processing procedure of forward process).Concerning the bag that all visiting mobile nodes send, Foreign Agent is finished the function of default router.
From above-mentioned working mechanism as can be seen, external host will be visited the mobile node that has left link-local, packets need process: nonlocal main frame sends---〉home agent and intercepts and captures the encapsulation of---〉home agent, transmits---〉Foreign Agent and intercept and capture the decapsulation of---〉Foreign Agent, forwarding---〉process that receives of mobile node.
In above-mentioned process, just there is the operation in a tunnel, the operation in tunnel has solved ambulant problem, but some negative effects have also been brought simultaneously, as IP fragmentation, because data link layer and restricted to the maximum frame length that can transmit at the hardware of their bottoms operation, this restriction is called MTU, and (MaximumTransfer Unit, English breviary: MTU), this restriction has limited the maximum length of the IP bag that can transmit in a frame.If the IP bag is bigger than the MTU of the data link layer that transmits it, will be with the IP packet fragmentation before transmission.Burst is divided into several segments (sheet) with a big IP bag exactly, so that each small pieces can be put among the MTU of data link layer.And in fact the tunnel is exactly to transmit in the payload that original IP bag is placed on new IP bag, has increased length, will cause IP fragmentation under some limiting case.
A negative effect that also has is exactly: for home agent and Foreign Agent, the expense in tunnel is huge, and often this operation becomes the bottleneck in the whole data transmission procedure.
Summary of the invention
Purpose of the present invention is exactly the problem that adopts tunneling mechanism to bring in the existing mobile IP technology in order to solve, and provide a kind of data package transmission method among the mobile IP, the mode of network address translation promptly is provided, it can reduce the operation of Foreign Agent, at this moment the transmission course of packet just becomes: nonlocal main frame sends---〉home agent and intercepts and captures---〉and home agent makes network address translation to session, transmitting---〉Foreign Agent transmits---〉the mobile node reception, it seems from mobile node, the promoter of session is a home agent, rather than original external host, therefore Foreign Agent need not to do complicated tunnel encapsulation, the operation of decapsulation, the default router of only serving as mobile node.
The object of the present invention is achieved like this, promptly substitutes original tunneling mechanism with network address translation, realizes the transmission of packet between external agent and the home agent; Expanded mobile agent and found message format, home agent receives that this message promptly carries out the network address translation operation; Safeguard the network address translation table of TCP/UDP/ICMP on the Foreign Agent; Foreign Agent is when doing the network address translation processing, and the value of revising TTL is 255, guarantees that packet is not dropped in transmission midway.
Concrete measure is:
1, the expansion mobile agent is found message
Mobile agent finds that message is arranged in the extension field that the ICMP router is found message, and mobile node is found the address and the indication corresponding tunnel encapsulation format of home agent by sending this message.
The expansion mobile agent is found to insert " N " bit by message, carries out network address translation (rather than tunnel encapsulation of GRE, IP in IP, Mini IP) in order to indicate home agent, and amended message format is seen Fig. 1.
2, increase a network address translation table in the home agent
Network address translation table is used for writing down the network address, port and other key mark before and after the conversion, because what transmit on the internet at present mainly is the IP packet, so consider the network address translation mode of the most frequently used several agreements.
For protocol type is the packet of TCP or UDP, need record: [home address of initiation session host IP address, initiation session host port, mobile node] and [home agent IP address, home agent another name port, mobile node are transferred the address], article one, list item comprises 6 territories, 2 key assignments, each is made of each key assignments 3 territories.Search and store and recommend to adopt Hash+chained list.The list item form is seen Fig. 2
For protocol type is the packet of ICMP, need record: [initiation session host IP address, ICMP inquiry identifier (English breviary: ICMP Query ID), the home address of mobile node] and [home agent IP address, home agent another name Query ID, mobile node transfer address], article one, list item comprises 6 territories, 2 key assignments, each is made of each key assignments 3 territories.Search and store and recommend to adopt Hash+chained list.The list item form is seen Figure of description 3
For each bar list item, must safeguard a life clock, if certain bar list item is not accessed in the time threshold of setting, will be deleted, otherwise can cause increasing without limitation of list item.
3, operating process
* the session of external host initiation and mobile node
Operating process is seen Fig. 4:
A. the external host packet rs destination address of sending is the home address of mobile node, and according to normal route, this packet will be sent to the home link of mobile node.
B. home agent is intercepted and captured this packet, inquires about the mobile node registration table of current storage, sees that this mobile node is whether on home link.If at home link, then normally transmit packet to this node, EO.Township's link if stay out continues.
C. home agent finds that mobile node has left home link, obtains its Care-of Address, the protocol type of resolution data bag from the mobile node registry key:
If the protocol type of this packet is TCP or UDP, inquire about the TCP/UDP network address translation table according to the key assignments that [home address of initiation session host IP address, initiation session host port, mobile node] formed, see whether there is corresponding list item, existing changes the d step, otherwise continues.
With the IP address that the source IP address of packet is revised as home agent, the source port of packet is revised as generate an at random and unduplicated another name port numbers of home agent, and destination address is revised as the Care-of Address of mobile node.If simultaneously comprise IP address and port numbers in the application for upper strata more, also to make similar modification, generate a network address translation table item then, comprise [home address of initiation session host IP address, initiation session host port, mobile node] and [home agent IP address, home agent another name port, mobile node are transferred the address], add in the network address translation table.Change the e step.
If the protocol type of this packet is ICMP, according to the key assignments inquiry ICMP network address translation table that [home address of initiation session host IP address, ICMP QUERYID, mobile node] formed, see whether there is corresponding list item, existing changes the d step, otherwise continues.
The source IP address of packet is revised as home agent IP address, and ICMP Query ID is revised as the generation at random and the unduplicated another name Query ID of home agent, and destination address is revised as the Care-of Address of mobile node.Generate a list item then, comprise [home address of initiation session host IP address, ICMP QUERY ID, mobile node] and [home agent IP address, home agent another name Query ID, mobile node are transferred the address], add in the network address translation table.Change the e step.
D. the requester network ATT is found to have had relevant entries, and is then the same to the operation of packet according to protocol type, but the inoperation network address translation table.
E. revising TTL is 255, because packet be transmitted in external host---may be in the process of home agent---Foreign Agent---mobile node because TTL 0 is dropped (the normal jumping figure that surpasses a data packet transmission probably), the value of revising TTL is very necessary, revise then verification and (comprise the IP verification and and more upper-layer protocol verification and).
F. home agent is sent to amended packet the foreign link at mobile node place.
G. Foreign Agent receives packet, is transmitted to mobile node.
* mobile node is replied the session of being initiated by external host
Operating process is seen Fig. 5:
A. mobile node sends packet.
B. Foreign Agent is transmitted packet.
C. home agent receives packet, the analysis protocol type:
If TCP or UDP are according to the key assignments reverse find network address translation table of [home agent IP address, home agent another name port, mobile node are transferred the address] composition.
If ICMP is according to the key assignments reverse find network address translation table of [home agent IP address, home agent another name Query ID, mobile node are transferred the address] composition.
If there is not corresponding list item, then do not make network address translation, EO, otherwise continue the d step.
If d. TCP or UDP, the key assignments reverse find network address translation table that home agent is formed according to [home agent IP address, home agent another name port, mobile node are transferred the address] obtains corresponding [home address of initiation session host IP address, initiation session host port, mobile node].The purpose IP that revises packet is the initiation session host IP address, and revising destination interface is the initiation session host port, and revising source IP is home agent IP address.
If ICMP, the key assignments reverse find network address translation table that home agent is formed according to [home agent IP address, home agent another name Query ID, mobile node are transferred the address] obtains corresponding [home address of initiation session host IP address, ICMP QUERY ID, mobile node].The purpose IP that revises packet is the initiation session host IP address, and revising Query ID is home agent another name Query ID, and revising source IP address is home agent IP address.
E. revising TTL is 255, revise then verification and (comprise the IP verification and and more the upper strata verification and).
F. home agent sends this packet, through normally routing to external host.
* the session initiatively initiated of mobile node
For the session that mobile node is initiatively initiated, directly adopt Care-of Address to finish by normal route.
Compare with traditional tunneling mechanism, have the advantage that improves processing data packets efficient during with the way access mobile node of network address translation.
The processing at two ends, tunnel promptly encapsulates the process with decapsulation, the resource that accounts for processor is a lot, the time-delay of bag is also very big, equipment must be received whole packet, it could be put in the load of packet of new structure, we know, make up data packet head and calculation check and process all be very complicated.With GRE (a kind of tunneling mechanism) is example, even adopted network processing unit, the treatment effeciency of equipment still drops to original 30%, and network address translation only needs the head of bag is made an amendment, handling need be after receiving whole packet, time-delay influence to bag is less, and it is original more than 80% that the treatment effeciency of equipment can reach.
For Foreign Agent, original complicated tunnel encapsulation reconciliation encapsulation operation can be omitted, and has improved the efficient of Foreign Agent handle packet.
In 3G (Third Generation) Moblie CDMA2 000 system, PDSN is the gateway node between the IP network of wireless system and packet switching.Its function be responsible for to set up, safeguard, interrupt with a wireless user between be connected, not only need to keep the A10/A11 interface communication, also serve as the effect of Foreign Agent simultaneously, obviously the treatment effeciency requirement to PDSN is very big.If the employing the technical program adopts network address translation in the home agent (router in the Packet Data Network), PDSN just can free from the work of the encapsulation of complexity and decapsulation, has improved the efficient of processing data packets.
In the F-engineR4000/MP6001/R8001 equipment that the present invention is at present just preparing to be applied to (Firberhome Networks of the FiberHome of Wuhan Institute of Post and Telecommunication).
Description of drawings
Fig. 1 is that the mobile agent after the expansion is found message;
Fig. 2 is the network address translation table of TCP/UDP;
Fig. 3 is the network address translation table of ICMP;
Fig. 4 is the flow graph of external host initiation and mobile node session data bag;
Fig. 5 is the packet flow graph that mobile node is replied external host; Wherein:
The 1-type, the value of this field is 16, is indicated as being mobile agent broadcasting expansion type;
2-length, the value of this field are 6+4*N, and wherein sequence number, registration life cycle, mark and reserved field amount to 6 bytes, and N refers to the number of the transfer address of broadcasting;
The 3-sequence number, the agent broadcast message number that sends after the mobile agent initialization;
4-registers life cycle, and this agency is ready to accept the maximum duration of register requirement;
5-keeps;
6-initiation session host IP address;
7-initiation session host port;
The home address of 8-mobile node;
9-home agent IP address;
10-home agent another name port;
The 11-mobile node is transferred the address;
12-ICMP?Query?ID；
13-home agent another name Query ID;
The 14-the Internet;
The 15-external host;
The 16-home agent;
The 17-Foreign Agent;
The 18-mobile node;
Describe in detail below in conjunction with accompanying drawing:
Fig. 1 finds message for the mobile agent after expanding, and has increased the tag field of N, and the indication home agent is carried out the network address translation operation, rather than tunnel encapsulation mechanism is come handle packet.The implication of each tag field of explained later:
R, expression needs registration;
B represents that this agency no longer accepts more mobile node register requirement;
H carries out the home agent function;
F carries out foreign agent functionality;
M shows the tunnel form that adopts minimum encapsulation;
G shows and adopts generic route encapsulation (English breviary: tunnel form GRE);
R, this byte is changed to 0 when sending;
T shows Foreign Agent support reverse tunnel;
N shows that home agent adopts the network address translation operation.
The TCP/UDP network address translation table of Fig. 2 for storing on the home agent, home agent are created list item according to the ICP/UDP session, search this table in the processing procedure of packet, obtain corresponding information, and packet is handled.
The ICMP network address translation table of Fig. 3 for storing on the home agent, home agent are created list item according to the ICMP session, search this table in the processing procedure of packet, obtain corresponding information, and packet is handled.
Fig. 4 is the flow graph of external host initiation with mobile node session data bag.
A. the external host packet rs destination address of sending is the home address of mobile node, and according to normal route, this packet will be sent to the home link of mobile node.
B. home agent is intercepted and captured this packet, inquires about the mobile node registration table of current storage, sees that this mobile node is whether on home link.If at home link, then normally transmit packet to this node, EO.Township's link if stay out continues.
C. home agent finds that mobile node has left home link, obtains its Care-of Address, the protocol type of resolution data bag from the mobile node registry key:
If the protocol type of this packet is TCP or UDP, inquire about the TCP/UDP network address translation table according to the key assignments that [home address of initiation session host IP address, initiation session host port, mobile node] formed, see whether there is corresponding list item, existing changes the d step, otherwise continues.
With the IP address that the source IP address of packet is revised as home agent, the source port of packet is revised as generate an at random and unduplicated another name port numbers of home agent, and destination address is revised as the Care-of Address of mobile node.If simultaneously comprise IP address and port numbers in the application for upper strata more, also to make similar modification, generate a network address translation table item then, comprise [home address of initiation session host IP address, initiation session host port, mobile node] and [home agent IP address, home agent another name port, mobile node are transferred the address], add in the network address translation table.Change the e step.
If the protocol type of this packet is ICMP, according to the key assignments inquiry ICMP network address translation table that [home address of initiation session host IP address, ICMP QUERYID, mobile node] formed, see whether there is corresponding list item, existing changes the d step, otherwise continues.
The source IP address of packet is revised as home agent IP address, and ICMP Query ID is revised as the generation at random and the unduplicated another name Query ID of home agent, and destination address is revised as the Care-of Address of mobile node.Generate a list item then, comprise [home address of initiation session host IP address, ICMP QUERY ID, mobile node] and [home agent IP address, home agent another name Query ID, mobile node are transferred the address], add in the network address translation table.Change the e step.
D. the requester network ATT is found to have had relevant entries, and is then the same to the operation of packet according to protocol type, but the inoperation network address translation table.
E. revising TTL is 255, because packet be transmitted in external host---may be in the process of home agent---Foreign Agent---mobile node because TTL 0 is dropped (the normal jumping figure that surpasses a data packet transmission probably), the value of revising TTL is very necessary, revise then verification and (comprise the IP verification and and more upper-layer protocol verification and).
F. home agent is sent to amended packet the foreign link at mobile node place.
G. Foreign Agent receives packet, is transmitted to mobile node.
Fig. 5 is the packet flow graph that mobile node is replied external host.
A. mobile node sends packet.
B. Foreign Agent is transmitted packet.
C. home agent receives packet, the analysis protocol type:
If TCP or UDP are according to the key assignments reverse find network address translation table of [home agent IP address, home agent another name port, mobile node are transferred the address] composition.
If ICMP is according to the key assignments reverse find network address translation table of [home agent IP address, home agent another name Query ID, mobile node are transferred the address] composition.
If there is not corresponding list item, then do not make network address translation, EO, otherwise continue the d step.
If d. TCP or UDP, the key assignments reverse find network address translation table that home agent is formed according to [home agent IP address, home agent another name port, mobile node are transferred the address] obtains corresponding [home address of initiation session host IP address, initiation session host port, mobile node].The purpose IP that revises packet is the initiation session host IP address, and revising destination interface is the initiation session host port, and revising source IP is home agent IP address.
If ICMP, the key assignments reverse find network address translation table that home agent is formed according to [home agent IP address, home agent another name Query ID, mobile node are transferred the address] obtains corresponding [home address of initiation session host IP address, ICMP QUERY ID, mobile node].The purpose IP that revises packet is the initiation session host IP address, and revising Query ID is home agent another name Query ID, and revising source IP address is home agent IP address.
E. revising TTL is 255, revise then verification and (comprise the IP verification and and more the upper strata verification and).
F. home agent sends this packet, through normally routing to external host.
Claims (1)
1, a kind of data package transmission method among the mobile IP is characterized in that substituting original tunneling mechanism with network address translation, realizes the transmission of packet between external agent and the home agent:
Expanded mobile agent and found message format, home agent receives that this message promptly carries out the network address translation operation;
Safeguard the network address translation table of TCP/UDP/ICMP on the Foreign Agent;
Foreign Agent is when doing the network address translation processing, and the value of revising TTL is 255, guarantees that packet is not dropped in transmission midway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021391831A CN1181655C (en) | 2002-10-17 | 2002-10-17 | Data packet transmission method in mobile IP |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021391831A CN1181655C (en) | 2002-10-17 | 2002-10-17 | Data packet transmission method in mobile IP |
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| CN1411231A true CN1411231A (en) | 2003-04-16 |
| CN1181655C CN1181655C (en) | 2004-12-22 |
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| CNB021391831A Expired - Lifetime CN1181655C (en) | 2002-10-17 | 2002-10-17 | Data packet transmission method in mobile IP |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005050914A1 (en) * | 2003-11-19 | 2005-06-02 | Huawei Technologies Co., Ltd. | Wireless lan network mobility management system and method thereof |
| WO2006131058A1 (en) * | 2005-06-06 | 2006-12-14 | Huawei Technologies Co., Ltd. | A method and device for implementing the security of the backbone network |
| CN100353726C (en) * | 2003-04-21 | 2007-12-05 | 华为技术有限公司 | Method for converting data message in two way |
| CN100450276C (en) * | 2005-02-01 | 2009-01-07 | 华为技术有限公司 | Method for transmitting message to mobile node by other-place agent in mobile IP network |
| CN1992675B (en) * | 2005-12-31 | 2010-07-14 | 中兴通讯股份有限公司 | Method for guaranteeing interconnection between network address conversion apparatus and external network |
| CN101257388B (en) * | 2008-04-08 | 2010-07-28 | 成都市华为赛门铁克科技有限公司 | Lawless exterior joint detecting method, apparatus and system |
| CN101494849B (en) * | 2009-03-11 | 2010-08-11 | 杭州华三通信技术有限公司 | Communication equipment, method and system thereof |
| CN1630259B (en) * | 2003-12-15 | 2011-03-30 | 松下电器产业株式会社 | Home agent apparatus, communication system, and communication method |
| CN1930835B (en) * | 2004-03-12 | 2011-11-09 | 艾利森电话股份有限公司 | Providing higher layer packet/frame boundary information in GRE frames |
| CN101465812B (en) * | 2009-01-06 | 2012-03-21 | 北京航空航天大学 | Redirection method for virtual machine network connection when on-line migrating striding sub network |
| CN104717316A (en) * | 2015-04-03 | 2015-06-17 | 山东华软金盾软件有限公司 | Client access method and system in trans-NAT environment |
| CN105978812A (en) * | 2016-05-06 | 2016-09-28 | 北京邮电大学 | Message forwarding method and device |
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2002
- 2002-10-17 CN CNB021391831A patent/CN1181655C/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100353726C (en) * | 2003-04-21 | 2007-12-05 | 华为技术有限公司 | Method for converting data message in two way |
| WO2005050914A1 (en) * | 2003-11-19 | 2005-06-02 | Huawei Technologies Co., Ltd. | Wireless lan network mobility management system and method thereof |
| CN100344199C (en) * | 2003-11-19 | 2007-10-17 | 华为技术有限公司 | System of radio local network mobility management and its method |
| CN1630259B (en) * | 2003-12-15 | 2011-03-30 | 松下电器产业株式会社 | Home agent apparatus, communication system, and communication method |
| CN1930835B (en) * | 2004-03-12 | 2011-11-09 | 艾利森电话股份有限公司 | Providing higher layer packet/frame boundary information in GRE frames |
| CN100450276C (en) * | 2005-02-01 | 2009-01-07 | 华为技术有限公司 | Method for transmitting message to mobile node by other-place agent in mobile IP network |
| WO2006131058A1 (en) * | 2005-06-06 | 2006-12-14 | Huawei Technologies Co., Ltd. | A method and device for implementing the security of the backbone network |
| CN1992675B (en) * | 2005-12-31 | 2010-07-14 | 中兴通讯股份有限公司 | Method for guaranteeing interconnection between network address conversion apparatus and external network |
| CN101257388B (en) * | 2008-04-08 | 2010-07-28 | 成都市华为赛门铁克科技有限公司 | Lawless exterior joint detecting method, apparatus and system |
| CN101465812B (en) * | 2009-01-06 | 2012-03-21 | 北京航空航天大学 | Redirection method for virtual machine network connection when on-line migrating striding sub network |
| CN101494849B (en) * | 2009-03-11 | 2010-08-11 | 杭州华三通信技术有限公司 | Communication equipment, method and system thereof |
| CN104717316A (en) * | 2015-04-03 | 2015-06-17 | 山东华软金盾软件有限公司 | Client access method and system in trans-NAT environment |
| CN104717316B (en) * | 2015-04-03 | 2017-11-14 | 山东华软金盾软件股份有限公司 | User end inserting method and system under a kind of across NAT environment |
| CN105978812A (en) * | 2016-05-06 | 2016-09-28 | 北京邮电大学 | Message forwarding method and device |
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| Publication number | Publication date |
|---|---|
| CN1181655C (en) | 2004-12-22 |
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