一个VPN软件（freeswan）的源码可编译，有MakeFile文件

数据包过滤防火墙-packet filtering firewall

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.

Winsock分层服务提供程序示例，包在文档中描述

基于IMD的防火墙驱动程序,网络过滤驱动开发的一 个好资料,驱动函数,结构体的阐述--

一个VPN软件（freeswan）的源码可编译，有MakeFile文件 -A VPN software (freeswan) can compile the source code, Makefile document has

这是一个简单的路由跟踪工具，通过发送UDP包，使初始TTL值为一，即发送到第一个节点时终止，返回，之后再将TTL值++，收集每个返回的ICMP信息即可得到封包经过的路由。-This is a simple routing tracking tool, by sending a UDP packet, so that the initial TTL value of 1, that is sent to the first node the termination, return, and then after the TTL value of++, The collection of each returned ICMP Information can be obtained after the routing packets.

znsoftu xfilter10u源码Fil防火墙1.0源码，网络安全

捕获IP数据包的小程序,原理是使用PCAP库.开发语言为C-IP packet capture the small programs, principles for the use of Cards. For the C programming language

查看连接并可以组包的程序- The examination connection and may the group package procedure

应用平台 UNIX　Jakal是一个在防火墙后进行扫描的秘密扫描程序。-Jakal UNIX application platform is a firewall scan after scan the secret proceedings.