We present the design, implementation, and evaluation of Mobile*IP, a set of IP-based protocols and mechanisms to support host mobilitythroughout the Internet. The design requires changes only in the mobile hosts and their special routers; leaves transport and higher protocols unaffected, and requires no changes in the device drivers for individual interfaces. No modifications whatsoever are needed in non-mobile hosts and routers, the system scales well, and has no single points of failure. We have implemented Mobile*IP under Mach 2.6, and the code is readily portable to any version of Unix that uses Berkeley networking code. 1 Introduction Motivation The continuing drop in prices and increase in functionality of personal, portable computers, the increasing availability of wireless networking options as well as wide-area research and commercial networking offerings, and an increased desire of users to carry these systems and connections with them while they travel, suggests a market...
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