The paper analyses the problem of security in local area networks which is based on arp,provides a new way of preventing arp spoofing through comparing with traditional way,and shows the codes of realization and comments.

• 该文在分析针对ARP协议弱点进行ARP欺骗所产生的局域网安全问题的基础上；通过与传统的防止ARP欺骗的方法相比较；提出了一种新的防止ARP欺骗的方法；同时给出了具体的代码实现和详细的注释.