在别处看到的，不是我写的，与大家分享 是一个ssl vpn的，感觉不错，很有用...

一款非常好的防火墙程序-one very good firewall procedures

The doorman guards the door of a server, manipulating firewall rules to admit only recognized parties

Web Server 过滤分析器-Web Server filter and analysis

ipchains防火墙的一个流量分析工具和配置工具-A flowing analysing and configurating tool about ipchains firewall.

防火墙编程之封包过滤 代码(内附说明) 希望能通过申请!我为人人,人人为我!-firewall packet filtering code (with description) want to be able to apply! I for everyone, everyone!

该程序透过服务器sock5代理访问防火墙外的程序，这里通过运行server程序来模拟远端。 不过该实例的运行需要有防火墙支持！-through the process server sock5 Acting visit outside the firewall procedures, here by running the server process to simulate remote. However, the example of the need to run a firewall support!

这个是华为开发的IVPN平台文档，主要应用于联通，移动等电信行业的虚拟网。-This is IVPN platform developed by Huawei documents, mainly used in China Unicom, mobile virtual network such as the telecommunications industry.

一个通过icmp包实现通信的小工具，里面详细介绍了，学习网络协议的好东西。

基于tdi驱动的个人防火墙，用vc++实现，是一个开源的防火墙-Tdi-driven based on the personal firewall, using vc++ Realized, is a open source firewall

华为防火墙培训教程，内容丰富，是学习网络知识的好材料。-Huawei training tutorial firewall, content-rich, knowledge networks are good study material.