NS2是指是一种针对网络技术的源代码公开的、免费的软件模拟平台，研究人员使用它可以很容易的进行网络技术的开发，而且发展到今天，它所包含的模块几乎涉及到了网络技术的所有方面。所以，NS成了目前学术界广泛使用的一种网络模拟软件。此外，NS也可作为一种辅助教学的工具，已被广泛应用在了网络技术的教学方面。因此，目前在学术界和教育界，有大量的人正在使用或试图使用NS。-NS2 is a network technology for open source, free software simulation platform, researchers can easily use it for network technology development, and development today, it contains a module to the network technology, involving almost all its aspects. Therefore, NS has become a widely used current academic network simulation software. In addition, NS also be used as a supplementary teaching tool, has been widely used in the network technology in teaching. Therefore, it is in academia and the education sector, a large number of people are using or attempting to use NS.