1引言 “互联网正在成为其自身成长的牺牲品”。爆炸式增长的业务量，日益增长的对多种服务质量的需求，尤其是对安全性和实时性的需求，已使 Internet不堪重负， IPv4不足日益明显体现出来：（ 1）地址空间不足；（ 2）对现有路由技术支持不够；（ 3）无法提供多样的 QoS质量 1 Introduction “The Internet is becoming a victim of its own growth.” Explosive growth of the business, the growing demand for a variety of quality of service, especially for security and real-time needs, have overwhelmed the Internet, IPv4 deficiency is increasingly evident: (1) inadequate address space; ( 2) inadequate support for existing routing technologies; and 3) inability to provide diverse QoS quality