Abstract
This chapter deals with IPv6, which provides much needed improvements for the Internet. It solves the address depletion problems of today's IPv4, and makes for a scalable Internet core, which helps improve the routing efficiency of the Internet as a whole. Two primary problems of the Internet can be solved with IPv6. Unlike IPv4, the IPv6 protocol is a means for hop-by-hop routing, authentication of packets, encrypted packets, tag switching, QoS, and other things. IPv6 also has the built-in capability of using multicast and unicast routing in a manner such that the boundaries can easily be scoped to ensure that the data do not go where they are not allowed. IPv6 introduces the use of an anycast address for applications that may be serviced by multiple machines. IPv6 is already in testing and has moved into production in some areas, connected via the 6Bone. This virtual backbone is provided for testing both IPv6 implementations and the protocol. IPv6 is a promising tool for the future of the Internet.
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