Based On The Ipv4 Mobile Ip Functionality

IPv4 uses hierarchical routing, and therefore a host's IP address uniquely identifies the host at a particular point of attachment to the Internet. The hierarchical routing is necessary to deal with the scalability issue of the Internet routing. This, means that a host has to be on the network indicated by its IP address in order to receive packets destined to it. Mobile IP is a scalable mechanism designed to accommodate host mobility within the Internet. It enables a mobile host to change its point of attachment to the Internet while keeping an unchanging IP address called its home IP address. It does not require changes in the existing routing infrastructure. It sits below the transport layer of the TCP/IP stack, and thus provides transparent mobility support to higher layer protocols. This paper comes from the 863 project——An embedded software platform for information and intelligent device. The paper mainly describes the Mobile IPv4 protocol and its implementation based on RedHat Linux. The paper first gives a chief introduction of the TCP/IP stack then gives a comprehensive research on Mobile IPv4 protocol includes the details of tunnel technique,the agent discovery,the registration process and the packet routing based on IETF Mobile IP specification (RFC 3220).The thesis finally describes an implementation scheme and a method to test our implementation.