可信息安全技术解析开发与实践，Linux下实现透明代理防火墙功能的程序-Analytical development and practice of information security technology, Linux transparent proxy firewall features program

Linux系统下基于队列机制的应用包过滤防火墙的实现，包括应用层IP报文获取的方案，可以扩展开发，对报文内容进行变换-Linux system based on the queue mechanism application packet filtering firewall implementation, including application layer IP packet for the program, can be extended development, the content

netfilter防火墙,实现ip过滤，协议过滤，端口过滤-netfilter firewall