LAUSR

Due to their specific structure and plenty of their utilization, mobile ad-hoc networks are vulnerable to various attacks. An attack which impacts on network layer is referred to as flooding attack. By transmitting several packets, this attack occupies the processor so that it cannot receive the remaining data and packets. Hence, it causes disruption and disorder in the network. In this paper, for preventing this problem, a method has been proposed based on DSR routing protocol which quickly identifies the flooding attack. Indeed, the proposed method not only identifies and detects the malicious nodes in comparison with valid and proper nodes but also imposes sufficient penalties and reconsiders it again. The method proposed in this paper is called defending against flooding attacks-dynamic source routing. At the outset, it detects misbehavior in the network; then, for discovering malicious nodes, it uses average packet transmission RREQ which measures average transmission route request (RREQ) packets. The results of simulating the proposed method in NS-2 environment indicated that it improved packet delivery rate and end-to-end delay.