ROUTE OPTIMMIZATION ON MOBILE IP : VIP IMPLEMENTATION

Abstract

The basic Mobile Internet Protocol (Mobile IP) provides a means for portable computers to roam freely, changing their point of attachment to the Internet, without having to change its IP address. Using the basic Mobile IP, all the datagrams destined to the mobile node are routed to its home agent first, and then tunneled to the mobile node. This asymmetric routing, called Triangle Routing, is generally far from optimal, especially when the destination node is close to the mobile node. The Route Optimization Extension Protocol enables correspondent nodes that implement them, to cache the binding of the mobile node, then tunnel the datagrams to it directly. It is a two step procedure, wherein border routers, known to the mobile host, are first updated and then previous foreign agent is informed about the new mobility binding. In this dissertation, basic mobile IP and the route optimization extension protocol have been compared through a simulation study. This implementation is based on the IETF mobile IP specification [2]. All required capabilities of mobile hosts, home agents, foreign agents and border routers are implemented. First the architecture of basic mobile IP is implemented. The basic routing scheme in Mobile IP is based on updating home agents, whenever a host moves to a new location. Next, the limitations caused because of Triangle Routing are removed by implementing the Route Optimization extension protocol, by updating home agents as well as correspondent nodes and border routers, whenever a host moves to a new location