本书从介绍IPv4中问题的产生和现状入手，详细阐述了IPv6的各个方面，包括IPv6的寻址结构、扩展头、身份验证和安全性、对任意点播和组播的支持以及对相关协议的影响，同时还探讨了IPv4向IPv6过渡的策略和应用。-This book describes the emergence and IPv4 in the present situation of the problem, explained in detail all aspects of IPv6, including IPv6 addressing structure, extension headers, authentication and security, for any on-demand and multicast support, and the relevant agreement impact, and also discussed the transition from IPv4 to IPv6 strategies and applications.