Examination of Impact of Flooding attack on MANET and to accentuate on Performance Degradation

------------------------------------------------------------------ABSTRACT-----------------------------------------------------------------Mobile Adhoc Networks (MANET) are new paradigm of wireless networks providing unrestricted mobility to nodes with no fixed or centralized infrastructure. Each node participating in the network acts as router to route the data from source to destination. This characteristic makes MANET more vulnerable to routing attacks. Flooding attack is one such attack which consumes more resource like bandwidth, battery power, etc. Reactive routing protocols like Adhoc On Demand Distance Vector (AODV) and Dynamic Source Routing (DSR) used in MANET has route discovery scheme and this makes it more easy for malicious node to launch flooding attack by flooding the route request packets(RREQ) in the network. In this paper, the behavior of flooding attack and the performance impact of flooding attack on AODV protocol is studied. The NS2 network simulator is used to evaluate the impact of flooding attack on AODV.