IPv6 移动性摘要

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　　移动设备的迅速普及带来了一项新的要求：设备必须能够在 IPv6 Internet 上随意更改位置但仍维持现有连接。为提供此功能，需要给移动节点分配一个本地地址，通过此地址总可以访问到它。在移动节点位于本地时，它连接到本地链路并使用其本地地址。在移动节点远离本地时，本地代理（通常是路由器）在该移动节点和正与其进行通信的节点之间传递消息。
　　我看到以下一段介绍，同各位分享一下：



　　IPv6 is short for "Internet Protocol Version 6". IPv6 is the "next generation" protocol designed by the IETF to replace the current version Internet Protocol, IP Version 4 ("IPv4").
　　Most of today's internet uses IPv4, which is now nearly twenty years old. IPv4 has been remarkably resilient in spite of its age, but it is beginning to have problems. Most importantly, there is a growing shortage of IPv4 addresses, which are needed by all new machines added to the Internet.
　　IPv6 fixes a number of problems in IPv4, such as the limited number of available IPv4 addresses. It also adds many improvements to IPv4 in areas such as routing and network autoconfiguration. IPv6 is expected to gradually replace IPv4, with the two coexisting for a number of years during a transition period.
　　Some introductory information about the protocol can be found in our IPv6 FAQ. For those interested in the technical details, we have a list of IPv6 related specifications.