Host Migration Transparency in IP Networks : The VIP Approach Fumio Teraoka and Mario Tokoro" Sony Computer Science Laboratory Inc . 3-14-13 Higashigotanda, Shinagawa-ku, Tokyo 141, Japan . tel : +81-3-3448-4380, fax : +81-3-3448-427 3 tera@csl .sony .co .j p Abstract Increasing portability of computers will require users in the future to access the network regardless o f location . Host migration transparency will be an essential feature of wide area network environments . We proposed the concept of virtual network and the propagating cache method to achieve host migratio n transparency [12] . We also established the feasibility of Virtual Internet Protocol (VIP), derived fro m Internet Protocol (IP), as an example of a virtual network protocol . In this paper, we define VIP i n detail and describe how VIP achieves host migration transparency in IP networks . We also show two VIP implementation approaches : 1) VIP as a sublayer ; and 2) VIP as an IP option . By modifying an operating systems kernel in each case, we implement VIP using both approaches . We then compar e both implementations in terms of overhead, backward compatibility, and other metrics . The measured performance indicates
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