本文从目前网络安全的形势出发,详细的阐述了计算机网络安全方面的信息安全传送、防火墙以及本地安全技术,重点分析了过滤路由安全防火墙构建技术,最后通过内部网络防火墙构建实例得出相关的结论。 Based on the current situation of network security, this paper elaborates on information security transmission, firewall and local security technology in computer network security. It analyzes the construction technology of filtering routing security firewall, and finally draws the conclusion through the example of constructing the internal network firewall .