職業(yè)學(xué)院通信工程技術(shù)專業(yè)-移動(dòng)ip節(jié)點(diǎn)技術(shù)-文庫(kù)吧
2024-12-22 22:18 本頁(yè)面
【正文】 bile IP Group, which mainly aims at mobile node seamless roaming in Inter. The most important feature of Mobile IP is that it can make mobile terminal roam in Inter with the same and not changed IP address. At the same time, munication cannot be interrupted all the time. The specific solution includes two parts: one is the solution of mobile node, and the other is the solution of the home .In this thesis, we carry out a scheme for agent searching process, registration amp。 registration reply process, and routing of the data packets towards the double protocol stack IPv4/ Discovery Agent discovery helps mobile node to confirm its position, and the mobile node must know which link it is, the home link or the foreign link. Through this process, the mobile node can make sure whether it has moved after the last registration. Agent searching is the most important precondition that cannot be absent to offer the roaming munication, for only by knowing it’s position, can mobile node registers its careof address obtained on foreign link on home agent properly. Then home agent can route the packets properly to mobile node according to the new way. After agent searching process, there es the registration, which keep the continuous contact between the mobile node and the home agent. Commonly, the home agent is a router in the home link of the mobile node, the mainly effect of which is transmitting the packets from other nodes to the roaming mobile node. When the mobile node is away from home link, it registers its careof address to its home agent. This is done through exchange of a Registration Request and Registration Reply messages (which are sent with UDP using well known port number 434). Depending on the method of attachment, the mobile node will register either directly with its home agent, or through a foreign agent, which forwards the registration to the home agent. The careof address can either be determined from a foreign agent’s advertisements (a foreign agent careof address), or by some external assignment mechanism such as DHCP (a colocated careof address). When the home agent receives the register message, it will maintain a register message WP=46table in the server, where the original registered care of address will be replaced by the new registered careof address. Then a reply message will be sent to the mobile node also by wellknown port 434. OK, all the register and reply process .the register, the packet can be routed in IP layer. Among all the routing process, our thesis emphasizes on the mobile node. The work of the mobile node mainly involves two parts, the one is that mobile node receives packets from other nodes, and the other is the mobile node actively municates with other nodes. If the mobile node receives packets from other nodes, there es two condition: one way is that its position is on the home route, then it will discover that the destination address of the packets is the home address, so it receives packets. The other way is that the mobile node is on the roaming foreign link, at this time, the packet’s destination address it receives will be the care of address transmitted by the home agent. In order to municate with other nodes only with its hom
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