介绍UC Berkeley改进过的NS2，介绍其功能、使用方法，与其一起工作的工具，分析其源代码，并介绍对它进行简单扩展的方法。-UC Berkeley introduced the NS2 improvement, introduces its function, using method, work with it tools, analyzes its source code, and introduce the method of simple expansion.

the above document gives a brief introduction to recovery mechanism with the source code of different mechanism.

it gives an introduction to network simulator 2, ns2. the code gives you a basic idea about ns2 on how to code.