自去年9月份以来,我院出现局域网频繁掉线的问题,给正常的教育教学带来极大的不便,造成这种现象的原因有很多,但主要是ARP攻击造成的。ARP协议存在着很多缺陷,攻击者正是利用这些漏洞实施ARP地址欺骗,对局域网的通信造成威胁。因此,通过对ARP协议的工作过程以及ARP欺骗原理进行分析,找到防治ARP攻击的方法,借此来达到维护局域网络安全的目的。 Since September last year, there has been a frequent disconnection of local area networks in our hospital, causing great inconvenience to normal education and teaching. There are many reasons for this phenomenon, but mainly due to ARP attacks. ARP protocol there are many flaws, the attacker is the use of these loopholes ARP address spoofing, the threat to the LAN communications. Therefore, by analyzing the working process of the ARP protocol and the principle of ARP spoofing, we can find a way to prevent and control ARP attacks so as to achieve the purpose of maintaining local area network security.