费尔防火墙源码以及安装文件，不错，推荐一下给站长

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

ibdnet为几个低级网络例程提供了一个简化的接口在，包括网络地址处理，内核arp(4) 和 route(4)表处理，防火墙，接口配置，以及原始以太网和IP数据包传输。-ibdnet network of several low-level routines to provide a simplified interface, including network addresses, core arp (4) and route (4) Table processing, firewall, port configuration, and the original Ethernet and IP packet transmission.

MODEM 调 制解调器开发的C 语言源程序.欢迎大家下载-MODEM modem developed by C language source code. Welcome everyone to download

Linux防火墙程序设计-Linux firewall program design

防火墙资源，文档说明具备相当价值-Firewall resources, document explains with considerable value

防火墙提供了内核模式的防火墙和 NAT 机制，这些机制可以通过用户模式运行的接口程序进行监视和控制。 防火墙规则可以使用 ipf(8) 工具来动态地设置和删除。 NAT 规则可以通过 ipnat(1) 工具来维护。 ipfstat(8) 工具则可以用来显示 IPFILTER 内核部分的统计数据。 最后， 使用 ipmon(8) 程序可以把 IPFILTER 的动作记录到系统日志文件中。 -Firewall provides a kernel-mode firewall and NAT mechanisms, these mechanisms can be run through the user-mode interface program to conduct surveillance and control. Firewall rules can use the ipf (8) tools to dynamically set up and delete. NAT rules can be adopted ipnat (1) tools to maintain. ipfstat (8) tools can be used to show the core part of IPFILTER statistics. Finally, the use of ipmon (8) program can record the movements IPFILTER to the system log file.

一个很好的C++帮助文档，很值得学习哦，如果你是一个新手的话，推荐你下载下来看看！-A good C++ Help document, is worth studying Oh, if you are a novice, then recommend you download it and see!

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

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