局域网内PC搜索的简单实现，枚举出当前在线主机及其IP，是学习C++网络编程的好素材-LAN PC search to achieve a simple, enumeration of the current online host and its IP, is to study C++ Network programming good material

NS-3是以C++为主要开发语言，采用Python作为配置、部署语言的新一代网络仿真系统，本文是学习权威指南，是学习Ns-3系统的入门级权威资料。-NS-3 is a C++ as the main development language, using Python as the configuration language to deploy simulation environment，Ns-3 is a new generation of network simulation syste