“FTP结构精灵”应用程序的源代码和可执行文件；代码比较精致容易看懂并为我们所用- "The FTP structure demon" the application procedure source code and may the execution file; The code quite fine is easy to understand and uses for us

This paper presents a comparative study of two well-known network simulators: OPNET Modeler and Ns- 2. Other studies in this area have generally been confined to just one simulator. The motivation of this paper is to provide a guide to researcher