一个特别简单的网络数据包捕获,嗅探工具,只能捕获不能修改发送.-A particularly simple network packet capture, sniffer tools can only capture can not be amended to send.

发送ARP包,可以遍历局域网里的主机,也可以得到主机名(Send ARP packet can traverse the host in the LAN, also can get the host name)