IPv6与NAT的分析比较

Analysis and Comparison IPv6 with Network Address Translation

计算机网络、电信网络和有线电视网三网正在走向融合的基于IP技术的下一代网络(NGN),导致了对地址资源需求的迅速增加,超出了最初预期和设计的32bit(IPv4地址长度)。解决地址资源短缺的思路大致有两类:1)“开源”,即使用地址长度更大的下一代IP协议——IPv6,这是一种中长期的解决方案;2)“节流”,即尽量提高对现有IPv4地址资源的利用率,比如使用私有复用加网络地址翻译(NAT)技术,是一些中短期的解决方案。本文分析比较了这两种技术的现状以及各自存在的问题。

The requirement of IP address resource is growing rapidly and has been over the former anticipation, a 32 bits IP address length ,because the computer networks, telcom networks and cable networks are converging to IP-based Next Generation networks(NGN). Methods to solve the address scarcity problem can be divided into two types: 1) More addresses, i.e., to utilize longer address length, such as IPv6, which are a medium-long term solutions. 2) More efficiency, i.e, to improve usage efficiency, such as using network address translation(NAT), a kind of multiplexing technologies, which are a short-medium term solution. The paper analyzes and compares the current situations and problems of these two technologies.