C08-Network_Protocols - Mobile Communications Chapter 8:...

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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8.1 Mobile Communications Chapter 8: Network Protocols/Mobile IP ± Motivation ± Data transfer ± Encapsulation ± Security ± IPv6 ± Problems ± Micro mobility support ± DHCP ± Ad-hoc networks ± Routing protocols
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8.2 Motivation for Mobile IP Routing ± based on IP destination address, network prefix (e.g. 129.13.42) determines physical subnet ± change of physical subnet implies change of IP address to have a topological correct address (standard IP) or needs special entries in the routing tables Specific routes to end-systems? ± change of all routing table entries to forward packets to the right destination ± does not scale with the number of mobile hosts and frequent changes in the location, security problems Changing the IP-address? ± adjust the host IP address depending on the current location ± almost impossible to find a mobile system, DNS updates take to long time ± TCP connections break, security problems
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8.3 Requirements to Mobile IP (RFC 3344, was: 3220, was: 2002) Transparency ± mobile end-systems keep their IP address ± continuation of communication after interruption of link possible ± point of connection to the fixed network can be changed Compatibility ± support of the same layer 2 protocols as IP ± no changes to current end-systems and routers required ± mobile end-systems can communicate with fixed systems Security ± authentication of all registration messages Efficiency and scalability ± only little additional messages to the mobile system required (connection typically via a low bandwidth radio link) ± world-wide support of a large number of mobile systems in the whole Internet
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8.4 Terminology Mobile Node (MN) ± system (node) that can change the point of connection to the network without changing its IP address Home Agent (HA) ± system in the home network of the MN, typically a router ± registers the location of the MN, tunnels IP datagrams to the COA Foreign Agent (FA) ± system in the current foreign network of the MN, typically a router ± forwards the tunneled datagrams to the MN, typically also the default router for the MN Care-of Address (COA) ± address of the current tunnel end-point for the MN (at FA or MN) ± actual location of the MN from an IP point of view ± can be chosen, e.g., via DHCP Correspondent Node (CN) ± communication partner
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8.5 Example network mobile end-system Internet router router end-system FA HA MN home network foreign network (physical home network for the MN) CN (current physical network for the MN) router
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This note was uploaded on 02/28/2008 for the course CSCI 6360 taught by Professor Wu during the Spring '08 term at University of Texas at Dallas, Richardson.

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C08-Network_Protocols - Mobile Communications Chapter 8:...

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