为了 解 决 互联网发展过程中遇到的这些问题，早在02 世纪09 年代初期，互联网工程任

务组IETF就开始着手下一代互联网协议Ipng(IP一thenextgeneration)的制定工作16].正TF 在

RFC155O里发出了征求新IP协议的呼吁，并公布了新协议需要实现的主要目标，包括支持几

乎无限大的地址空间:减小路由表的大小 使路由器能更快地处理数据包:提供更好的安全

性，实现IP级的安全 支持多种服务类型，并支持组播:支持自动地址配置，允许主机不更

改地址实现异地漫游 允许新旧协议共存一段时间 支持可移动主机和网络等具体要求。-Development of the Internet in order to resolve the encounter in the course of these problems, as early as 09 in the early 02 century, the Internet Engineering Task Force IETF started on next-generation Internet protocol Ipng (IP 1 thenextgeneration) the development of 16]. RFC155O is sent in TF the solicitation of new IP protocol called for, and announced a new agreement on the need to achieve the main objectives, including support for almost infinite address space: reduce the size of routing tables so that routers can deal with packets faster: to provide better security, the realization of IP-level security support multiple types of service and multicast support: Support for automatic address configuration, the host does not permit the achievement of change of address in different places both old and new roaming agreements permit the coexistence of a certain period of time to support the mobile host and network specific requirements.