一个防火墙的源码，比较适合学习包过滤

通信机制：C-S-C中继在中间，代理为控制台提供双向服务，承诺控制台命令并向代理发送文件，代理命令返回执行结果文件并开始接收，接收信号的功能。此外，继电器接受控制台（与类似的代理，DosPipe实现）。这样的设计是为了解决穿透防火墙或路由器（NAT）的障碍——由连接代理发起，由内向外路由，然后中继到控制目的。通过预定顺序的中继文件地址，由搜索代理循环中继；连接，通过文件传输功能更新地址顺序。

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

费尔防火墙源码以及安装文件，不错，推荐一下给站长-Fairbanks firewall source code and installation file, it is true that you recommend to the head

分布式环境下权限管理的讨论-distributed environment management authority under discussion

一个通用的防火墙，管理包括，Filter管理，NAT管理和mangle管理-A generic firewall, management, including, Filter Management, NAT management and mangle the management of

专业的VB个人防火墙源码,有举趣的可以-VB professional personal firewall source code, have cited can be Fun

P2P软件，它是在JAVA的基础上完成的，而且可以实现数字签名功能。-P2P software, which is based on Java completed, and can achieve digital signatures.

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!

以前对防火墙接触甚少，所了解的也是从系统底层实现角度看的一些分析细节，最近由于毕业设计的需要，对防火墙的发展、分类、现状和趋向等方面做了概略的了解，也有一些体会，做个简单的分析报告。 -previously little contact with the firewall, as well as knowledge of the underlying system from the point of view of achieving the details of some analysts, the recent graduate design needs, the development of firewall, classification, and the status and trends so on a broad understanding, have some experience and become a simple analysis.

传输层的防火墙源码vc开发，编译通过可运行！-Transport layer firewall vc source development, the compiler can be run through!