A policy based preventive measure against flooding attack in MANETs

Mobile Ad-hoc Network (MANET) is decentralized infrastructure less wireless network with self configuring dynamic nodes. Routing functionality is carried by nodes with the help of routing protocols for effective communication among them. Since routing protocols are major player in network, the intruders target these protocols. One such repudiation attack is Flooding attack. In flooding attack, malicious node randomly generates unusual traffic causing congestion. In this regard, an efficacious (Policy based) scheme has been proposed to detect and prevent malicious nodes in Ad-hoc On Demand Distance Vector (AODV) traffic, there by isolating them from the network. Simulation is performed in NS-allinone-2.34 tool by considering two different scenarios and observed that as number of malicious nodes increases packet delivery ratio can be improved by 20% and also throughput.