考虑IPv4过渡到IPv6的长期性,兼容已有IPv4应用,用IPv6/IPv4双协议栈模式建设农村综合信息服务平台网络。采用接入层、汇聚层和核心层三层网络结构,利用IPv6 in IPv4手工隧道连通CERNET2主干网。用IPv4地址映射到IPv6地址方法规划分配IPv6地址,路由使用静态路由和默认路由。用户主机通过直接接入和ISATAP自动隧道两种方式接入网络,访问IPv6应用。 Consider the long-term transition from IPv4 to IPv6, compatible with existing IPv4 applications, and build a network of integrated rural information service platforms with IPv6 / IPv4 dual-protocol stack mode. The access layer, convergence layer and core layer three-tier network structure, the use of IPv6 in IPv4 manual tunnel to connect CERNET2 backbone. Map IPv4 Address to IPv6 Address Method You plan to assign IPv6 addresses, and routes use static routes and default routes. Hosts access the network through both direct access and ISATAP automatic tunnel access to IPv6 applications.