摘要　随着计算机网络深入社会、经济、国防、科技与文教等各个领域, 计算机系统的安全问题正

变得日益复杂和突出. 资源共享和网络分部更增加了网络收到威胁和攻击的可能性, 于是基于包

过滤加状态检测的防火墙系统成为保护网络安全的工具. 文中介绍一种集数据包过滤、日志、代理

服务于一体的复合型防火墙系统, 着重论述利用VC+ + 编程技术实现数据包过滤的软件方法.

关键词　复合型防火墙, 包过滤, 网络安全-summary of the computer network with in-depth social, economic, defense, science and technology and culture, and other fields, Computer system security is becoming increasingly complex and prominent. sharing resources and networks division also increased the network received threats and the possibility of attack, So based on packet filtering plus state inspection firewall protection system has become a tool for network security. This paper introduces a set of data packets filtering, log, agent services in the integration of complex firewall system, focuses on the use of technology to achieve VC data packet filtering software. Keywords composite firewall packet filtering, network security