Abstract: The misbehavior that deliberately modifies the parameters of wireless NIC (Network Interface Card) driver impairs the legitimate users’ rights,even may cause DoS attack and cripple the entire WLAN．To defense against such misbehavior,this paper proposed a defense mechanism that is applied at AP which controls the nodes’ sending speed by dropping the incoming packets in a certain rule and makes WLAN users to use wireless channel fairly．We constructed a WLAN to test our proposed algorithm by applying it in wireless NIC driver．The experiments show that our algorithm performs well in defensing against MAC layer misbehavior even against DoS attack．

Key words: WLAN,MAC,Misbehavior,DoS attack