libnet是UNIX系统同台上网络安全工具开发的重要的库，它和libpcap、libnids一起，给网络安全工具的开发人员提供了一组丰富而且完全的武器，使之得以很方便地编写出结构化强、健壮性好、可移植性高等特点的程序。-Libnet is a generic networking API that provides access to several protocols. It is not designed as a all in one solution to networking.

Socket接口是TCP/IP网络的API，Socket接口定义了许多函数或例程，程序员可以用它们来开发 TCP/IP网络上的应用程序。要学Internet上的TCP/IP网络编程，必须理解Socket接口。-Socket interface is a TCP/IP network, API, Socket Interface defines a number of functions or routines that programmers can use them to develop T

Linux Network API, Amanda extension for IP connection tracking