Abstract: This paper analyses the structure of IP data packages in IPv4/IPv6 host computer tunnel, proposes the structure model of the compulsory tunnel between IPv4/IPv6 host computers, and makes use of technology, such as PCAP, MySQL C, buffering area, etc. to realize the compulsory tunnel between IPv4/IPv6 host computers. The compulsory tunnel is set up automatically while IPv6 resources are visited, and the course is transparent to users.

Key words: Compulsory tunnel; IPv6; PCAP; MySQL C

摘要： 分析了IPv4/IPv6 主机隧道IP 数据包的结构，提出了IPv4/IPv6 主机之间强制隧道的结构模型，并利用PCAP、MySQL C、缓冲区等技术实现了IPv4/IPv6 主机之间强制隧道。强制隧道在IPv6 资源访问过程中自动建立，建立的过程对用户是透明的。

关键词: 强制隧道；IPv6；PCAP；MySQL C