毕业论文___ipv4ipv6过渡技术综述.doc

目 录 目 录 I 摘 要 III Abstract IV 第一章 IPv4与IPv6对比 1 1.1 IPv4简介 1 1.2 IPv4的不足之处 2 1.3 IPv6的众多优势 3 1.4 IPv6地址表示方式 4 1.5 IPv6地址分类 5 1.6 IPv6国内外发展现状 6 1.6.1 国内IPv6发展历程 6 1.6.2 IPv6在美国 6 1.6.3 IPv6在欧洲 7 第二章 现有的IPv4-IPv6过渡技术 8 2.1 IPv4-IPv6过渡的原则 8 2.2 平滑过渡的技术难点 8 2.3 IPv4-IPv6过渡中的节点类型 9 2.4 IPv4-IPv6的三种基本过渡技术 9 2.4.1 双协议栈技术(Dual Stack) 9 2.4.2 隧道技术(Tunnel) 10 2.4.3 网络地址转换/协议转换技术(NAT-PT) 10 2.5 基于这三种基本技术的派生方案 11 2.5.1 IPv6孤岛之间的通信 11 2.5.2 IPv6孤岛与IPv4海洋之间的通信 19 2.6 IVI 30 2.6.1 IVI简介 30 2.6.2 IVI地址格式 31 2.6.3 IVI的特点 32 2.7 IPv4-IPv6过渡技术的选择 32 2.8 IPv6组播 33 2.8.1 组播地址 34 2.8.2 IPv6组播技术 35 2.9 IPV4-IPv6组播过渡技术 36 2.9.1 双栈技术 37 2.9.2协议转换技术 37 38 2.10 MTG多播转换网关模型 39 39 2.10.2 模型结构 40 MTG的工作流程 42  IPv4-IPv6 Transition Technology Overview Abstract The late 20th century, especially since the 21st century, the rapid development of computer network as well as its widely used, has had a profound impact on the development of the world, it can be said, the computer network has become an integral part in our daily life.IPv4, as the initial agreement of the Internet, it should be said,doubtless,is already quite mature, moreover,have to say that the design of IPv4 should be successful, but with the scale of network and application requirements continue to increase, especially in recent years,the IPv4 existing problems have been exposed, such as the serious shortage of address space ,Qos quality of service, routing tables swelling and so on.In order to solve these problems, IPv6 came into being, IPv6 has 128-bit address of the space, which can effectively solve the problem of lack of IPv4 space. In addition, IPv6 has many other advantages, such as simplified header,Qos satisfaction, built-in security, and so on. Therefore,IPv4 to IPv6 transition ,which has become inevitable. However, IPv4 to IPv6 transition can not be done overnight, the reason is that the current network is based on the IPv4 protocol, the majority of Internet hosts only support IPv4, and many devices only suppor