一个IP数据包过滤工具库源码，含有一个IPMonitor程序，可以查看所有IP包头信息。对编写包过滤防火墙很有用...

NetBSD和FreeBSD上实现的IPSec实现，支持各种安全协议的组合，包括AH、ESP、AH＋ESP等-NetBSD and FreeBSD to achieve the realization of IPSec support various combinations of security protocols, including AH, ESP, AH+ ESP etc.

一个简易的网络防火墙，vc++实现，测试通过，可以运行-A simple network firewall, vc++ to achieve, the test can be run

开发Windows 2000_XP下的防火墙!想搞防火墙的看看吧!里面写得真是不错!-2000_XP under Windows firewall! Wanting to look at the firewall! They write really good!

获取本地网络设置和网卡信息的简单程序，具有很高的效率-Access to the local network settings and network card information simple procedure with high efficiency

用汇编编写程序，任意输入两个数进行四则运算。要求从键盘输入数据和运算符，并把运算的结果显示在屏幕上。 你好-used to prepare the compilation process, arbitrary number of input 2 for 4 operator. Requests from the keyboard data entry and Operators, and the results of operations on the screen. Hello

snort防火墙源代码，该防火墙据有很完善的功能。-snort firewall source code, the firewall has a very sound, according to function.

防火墙是网络安全的关键技术,其核心思想是在不安全的网络环境中构造一个相对安全的子网环境.本文重点就网络安全论述了网络防火墙安全技术的分类及其主要技术特征、防火墙的安全功能、实现防火墙的主要技术手段、防火墙技术优点和缺点、防火墙发展的新技术趋势以及防火墙部署原则,并从防火墙部署的位置详细阐述了防火墙的选择标准.并就信息交换加密技术的分类加以分析,针对PKI技术这一信息安全核心技术,论述了其安全体系的构成. -A firewall is a key network security technologies, its core idea is the network in an unsafe environment to construct a relatively safe environment subnet. This paper focuses on network security firewall on the network security technology classification and its main technical features, firewall, security function, the realization of the main technical means of the firewall, firewall technology advantages and disadvantages, firewall development of new technology trends and the deployment of the principle of a firewall from a firewall in detail the location of the deployment of firewall selection criteria. and the exchange of information, the classification of encryption technology to analyze , PKI technology for the core of the information security technology, discusses the composition

一个 ip过滤源代码的c++工程，可以看作简单的防火墙，希望对大家有帮助-an ip filter source code c works can be seen as a simple firewall, and I hope to be helpful

简易防火墙程序. 简易防火墙程序.-Simple firewall program. Simple firewall program.

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