实现基本的IP地址与MAC地址的对应，从而分析出mac地址的结构特点-To achieve the basic IP address and MAC address corresponding to analyze the structural characteristics of mac address

一个测量网络带宽的小工具，能够向目的IP地址发送数据包并测量逐跳网络带宽，存储测量结果。测量方法值得学习。-utility that estimates the latency and bandwidth of Internet links by sending UDP packets from a single source and measuring round-trip times. The basic mechanism is similar to ping and