一个主机接收到与自已相同IP发出的ARP请求就会弹出一个IP冲突框来。利用局域网终结者可以伪造任一台主机的IP向局域网不停地发送ARP请求，同时自已的MAC也是伪造的，那么被伪造IP的主机便会不停地收到IP冲突提示，致使该主机无法上网。这便构成了局域网终结者的攻击原理。 -A host receives the same with their own IP ARP requests issued by an IP conflict box will pop up to. Terminator can be forged by any one of the LAN host to the LAN IP to send ARP requests for non-stop, while their own MAC is forgery, then the host will be forged IP IP conflict constantly received prompt, with the result that the host can not Internet. This constitutes the LAN Terminator attacks principle.