Detection of Sink Hole Attacks in MANET

A mobile ad-hoc network (MANET) is most popular example of wireless mobile communication. This network set up by the collection of multi-hop and self-configured mobile nodes without any network infrastructure. Topology of these network changes rapidly and unpredictably. Since mobile nodes are communicating with each other and willing to forward packets to other nodes in the network. These types of networks are more vulnerable to various security threats. One of the major security attacks in MANET is denial of service (DoS) attack. This paper concentrates on the study of the effects of two types of DoS attacks, namely Gray hole attack and Black hole attack in MANET using the reactive routing protocol and also provide the solution to black hole attack. All experiments are simulated for Gray Hole attacks, for black hole attack and for a solution under a variety of ad hoc network conditions such as throughput, packet deliveryratio and normalized routing load inorder to understand the severity of this attack. All simulation is done by network simulator (NS-2).