Mobile ip

Mobile ip

1. Mobile Internet Protocol (or Mobile IP) Asst.Prof. Rupali Lohar Dept. of Computer Science & Engineering B. R. Harne College Of Engineering & Technology,   Karav, Post Vangani (W Tal Ambernath , Mumbai, Maharashtra 421503

2. Mobile Internet Protocol (or Mobile IP) Mobile IP is a communication protocol (created by extending Internet Protocol, IP) that allows the users to move from one network to another with the same IP address. It ensures that the communication will continue without user’s sessions or connections being dropped. Allow mobile device users to move from one network to another without changing their IP address.

3. Terminologies: Mobile Node (MN): It is the hand-held communication device that the user caries e.g. Cell phone. Home Network: It is a network to which the mobile node originally belongs to as per its assigned IP address (home address). Home Agent (HA): It is a router in home network to which the mobile node was originally connected

4. Foreign Network: It is the current network to which the mobile node is visiting (away from its home network). Foreign Agent (FA): It is a router in foreign network to which mobile node is currently connected. The packets from the home agent are sent to the foreign agent which delivers it to the mobile node. Correspondent Node (CN): It is a device on the internet communicating to the mobile node. Care of Address (COA): It is the temporary address used by a mobile node while it is moving away from its home network.

5. Example network mobile end-system Internet router router end-system FA HA MN home network foreign network (physical home network for the MN) router (current physical network for the MN) CN Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8. 5

6. The Internet host sends a datagram to the mobile node using the mobile node's home address (normal IP routing process). If the mobile node is on its home network, the datagram is delivered through the normal IP process to the mobile node. Otherwise, the home agent picks up the datagram. If the mobile node is on a foreign network, the home agent forwards the datagram to the foreign agent. The foreign agent delivers the datagram to the mobile node. Datagrams from the mobile node to the Internet host are sent using normal IP routing procedures. If the mobile node is on a foreign network, the packets are delivered to the foreign agent. The foreign agent forwards the datagram to the Internet host.

7. Features of Mobile IP Compatibility-compatible with existing IP Transparency- no effect of mobility Efficiency- more efficient communication Security- provide secure communication Scalability- support scalable

8. Working of mobile IP address Agent discovery-MN discover its FA & HA Registration – current location ,HA tunneling

9. Registration t MN HA registration request registration reply t MN FA HA registration request registration request registration reply registration reply Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8. 10

10. Figure 1–2 Mobile Node Residing on Home Network

11. Overview CN router HA router FA Internet router 1. 2. 3. home network MN foreign network 4. CN router HA router FA Internet router home network MN foreign network COA Sender sends to the IP address of MN, HA intercepts packet HA tunnels packet to COA by encapsulation FA forwards the packet to MN Reverse: Sender sends to IP address of receiver, FA is default router Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8. 12