一个VPN软件（freeswan）的源码可编译，有MakeFile文件

又一个防火墙源代码，是用VC做的，功能虽然比较简单，但对初学者有用吧-also a firewall source code is the use of VC do, even though it is relatively simple, but it useful for beginners

一段网络监控程序的源码,里面有说细的注释-network monitoring procedures for the source, and they said fine Notes

防火墙与因特网安全的一些知识-Firewall and Internet security knowledge

数据包过滤防火墙-packet filtering firewall

Linux IP包过滤的增强 -Linux ip packet filter s enhance

ip-filter不但具有SNAT、DNAT、端口映射、透明代理等已经成熟的功能，同时还实现了IPv4和IPv6协议以及IPSec安全协议的支持。此外还有诸如规则分组、blackhole、数据包捕获等特色-ip-filter not only had SNAT, DNAT, the port mapping, the transparent proxy and so on already the mature function, meanwhile has realized IPv4 and the IPv6 agreement as well as the IPSec security agreement support. In addition also has such as the rule grouping, blackhole, characteristic and so on data packet capture

Unix下检查不安全配置的程序 -Checking non-safe configuration in Unix

一个简单的防火墙程序- A simple firewall procedure

简单防火墙-Simple firewall

这是一个基于Windows环境的硕士论文，由于大家很多不能上网下载，故发出来，对大家应该有较好的参考作用。-This is a Windows environment based on the master