The study of Intrusion Detection Techniques for Cooperation of Node

Since there is no infrastructure in mobile ad hoc n etworks, each node must rely on other nodes for coo peration in routing and forwarding packets to the destination. Intermediate nodes might agree to forward the packe ts but actually drop or modify them because they are misbe having. The simulations in show that only a few mis behaving nodes can degrade the performance of the entire sys tem. There are several proposed techniques and prot ocols to detect such misbehavior in order t o avoid those nodes, and some schemes also propose punishment as well. It is very difficult to design once- for strategy may be more feasible. A secure protocol sh ould at least include addition, it should provide a scheme to easily add new security features in the future. Due to the imp ortance of MANET routing protocols, we focus on the detection of attacks targeted at MANET routing protocols Thi WatchDog and Pathrater approach. A watchdog identifies the misbehaving nodes by eavesdropping on the transmission of the next hop. A path rater then hel ps to find the routes that do not contain those nod es. In DSR, the routing information is defi message through intermediate nodes until it reaches the destination.