局域网内的网络安全是一个值得大家关注的问题，往往容易发起各种欺骗攻击，这是局域网自身的属性所决定的--网络共享。本代码所讲解的DNS ID欺骗是基于ARP欺骗之上的网络攻击，如果在广域网上，则比较麻烦。-LAN network security is a matter of concern, they often initiate a variety of spoofing attacks, which is determined by the properties of their own local area network- the network share. The code explains the DNS ID spoofing is based on ARP spoofing attacks on the network, if the WAN is too much trouble.