Misbehavior Routing Identification by Collaborative Contact Based Detection in MANET

The continuously self-configuring, Infrastructure less Mobile Ad-hoc Networks (MANETs) route in effective manner by utilizing the voluntary cooperating nodes. That is the ability of each node to move independently and freely, thus can configure the links to other nodes frequently. Certain node refuse to cooperate and leads to the selfish behavior and such nodes are named as selfish nodes, whose existence will degrade the network performance. A wellknown existing method to detect such selfish nodes was the watchdog mechanism. Focusing only on this watchdog system alone will fail to detect all the selfish nodes, may generate false positives and negatives and thus by leads to wrong operation. Also it created poor system performance in terms of speed and precision. These were much important factors in the networks with sporadic contacts such as opportunistic and delay tolerant networks, because watchdog lack enough time and information to detect the selfish nodes. Thus propose a collaborative approach based on the diffusion of local selfish node awareness when a contact occurs. Thus the information about the selfish node is propagated quickly in the network, which leads to improved speed and precision while detecting the selfish nodes. With the help of other nodes can avoid such nodes while routing in the network.