IPv4的网络和业务将会在一段相当长的时间里与IPv6共存,很多IPv6的通信不得不在IPv4网路上传输，因此过渡机制非常重要,文章对过渡进行了详细描述-The IPv4 and IPv6 networks and services will coexist for a long period of time, a lot of IPv6 traffic over an IPv4 network transmission had, therefore transitional mechanism is very important article for a detailed descr iption of the transition