ARP hijacking and performance enhancing method in wireless local area network

The invention discloses an ARP hijacking and performance enhancing method in a wireless local area network. A distributed ARP table is used for storing ARP responses, and the probability of losing of an ARP packet is lowered; a snooping mechanism of the ARP packet is adopted; the ARP mechanism and a DHT are combined, IP articles are stored and checked in a DHT manner, the phenomenon of losing of the ARP broadcasting packet is reduced, and the ARP efficiency is improved. According to the ARP hijacking and performance enhancing method, broadcasting data packets in the network are reduced, and the network load is relieved; the problem that the broadcasting packets are adopted for traditional ARP request packets, the ARP request packets are possibly lost, and the broadcasting packets are sent multiple times is solved; the ARP responses are put on some known nodes through an SAL, the nodes are obtained through the hash operation on IP addresses of the nodes, after the ARP request broadcasting data packets are intercepted, unicast of the data packets is conducted on the nodes, and the data packets broadcasted in the network are reduced. In addition, when an article corresponding to a certain IP does not exist in the SAT in a receding mechanism, ARP requests can be broadcasted out, a traditional ARP mechanism responds to the ARP requests, and the compatibility with the traditional ARP mechanism is ensured.