很好的防火墙框架自动生成程序代码，可以自动生成，省略更多麻烦...

OPENVPN源代码，功能强大，在数据链路层做的-OPENVPN source code, powerful, the data link layer to do

tcp_wrappers_7.6 Unix下的防火墙源码-tcp_wrappers_7.6 Unix source firewa

des算法的实现-des Algorithm Implementation

Linux IP包过滤器 -Linux ip packets filter

一个专业的防火墙软件，主要针对目前的端口，共享，能监控系统的安全状态，检测到问题能准确通知用户，更新部分模块，增加了实用、可操作性以及提高准确性-A professional firewall software, mainly targeted at the port, share, capable of monitoring the safety of the system state, to detect the problem accurately inform the user, update a number of modules, an increase of utility, maneuverability and enhance the accuracy of

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

耐威网关软件防火墙简易版 1.0-resistance Granville gateway firewall software simple version 1.0

阻止弹出广告的源码，vc的，经测试，可以借鉴-stop pop-up advertisements source, vc, tested, we can draw

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.

驱动程序开发的例子，tdi防火墙源代码，数据封包的拦截，过滤等-Driver Development example, TDI firewall source code, data packet interception, filtration, etc.