Mitigation and performance evaluation Mechanism for Selfish Node Attack in MANETs

In today's era of Internet, the trends for attacks can vary from financial to political gain. Secured communication especially is a major challenge in wireless Ad-hoc systems such as MANET. Because of two characteristics, Dynamic topology and no centralized administration, MANET is very much prone to different security attacks. One of the most important classifications of attack is Distributed Denial of Service (DDoS). The DDoS attack is distributed, and also attempt by several malicious nodes to flood the targeted attacker in the network with a huge number of data packets. This proposed work explains the mitigation method by using node isolation method so that once the malicious node is detected, it will be moved out from the cluster and hence the packet drop in the network due to Selfish Node attack can be reduced. Also, in this proposed work performance evaluation of ad-hoc distance vector (AODV), Ad-hoc On-demand Multipath Distance Vector(AOMDV), Destination Sequenced Distance Vector(DSDV) Routing protocols has been analyzed based on Throughput and Packet delivery ratio parameters using the NS2 simulator.