In recent years, with rise of "Three Networks Convergence" concept, IPv6 network planning problem become a hot topic again. The network is migrated from IPv4 to IPv6 on the surface with migration mechanism, but in fact, IPv4 and IPv6 need to run extendedly in most networks, how to introduce IPv6 into network and how to make interoperate between IPv6 and IPv4 become an urgent problem. The core idea and operating process of 6to4 tunnel technology that can solve the problem are deeply discussed in paper, and a specific experiment network is proposed to explain and analyze.%近些年随着“三网融合”概念的兴起,IPv6网络规划问题再度升温成为一个热点话题.迁移机制表面上是把IPv4网络迁移到IPv6的方法.实际上,IPv4和IPv6需要在大多数网络上长期共同运行,怎样将IPv6引入网络及如何使IPv6与IPv4互操作是一个急需解决的问题.论文深入探讨了用于解决该问题的6to4隧道技术的核心思想及运作过程并给出具体实验网络加以说明.
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