This paper describes the agreement principle. It analyzes two ways of ARP deception and their harm. It proposes technological measures to counteract two types of ARP deception.

• 摘要在阐述ARP协议原理的基础上，分析了两种类型ARP欺骗的实现方式及造成的危害，提出解决这两种ARP欺骗的技术对策。