[Madhanmohan et al., 3(4): April, 2014] ISSN: 2277-9655 Impact Factor: 1.852 http: // www.ijesrt.com(C)International Journal of Engineering Sciences & Research Technology [4019-4023] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY Dection of Routing Misbehaviour in MANET Dr. R. Madhanmohan *1 , K.Manikandan 2 *1 Assistant Professor, 2 P.G Student, Department of Computer Science Engineering, Annamalai University, Annamalai Nagar, India maniprems.k@gmail.com Abstract Ad hoc on demand Distance Vector (AODV) is one of the most suitable routing protocols for the MANETs and it is more vulnerable to black hole attack by the malicious nodes. A malicious node that incorrectly sends the RREP (route reply) that it has a latest route with minimum hop count to destination and then it drops all the receiving packets. Therefore, we proposed the multiple IDS (intrusion detection system) nodes are deployed in MANETs in order to detect and prevent selective black hole attacks. All IDS perform an ABM (Anti-Black hole Mechanism) which estimates the suspicious value of a node, according to the amount of abnormal difference between RREQs and RREPs transmitted from the node. The NS2 simulation results confirmed that the propose protocol IDS shown better performance than conventional protocol AODV Keywords: Intrusion detection system (IDS), Black hole attack. Introduction A Mobile Ad hoc network (MANET) is an autonomous network that consists of mobile nodes that communicate with each other over wireless links. These types of networks are suitable for usage in situations where a fixed infrastructure is not available, not trusted, too expensive or unreliable. In the absence of a fixed infrastructure, nodes have to cooperate in order to provide the necessary network functionality. Routing is one of the primary functions each node has to perform anytime and anywhere in order to enable connections between nodes that are not directly within each other’s sending range [1]. The development of efficient routing protocols is a nontrivial and challenging task because of the specific characteristics of a MANET environment. An example of MANET environment is shown in Figure. Figure 1.1AdHoc Networks Each mobile node acts as a host when requesting/providing information from/to other nodes in the network, and acts as router when discovering and maintaining routes for other nodes in the network. MANET nodes perform the routing functions themselves. Due to the limited wireless transmission range, the routing generally consists of multiple hops[2]. Therefore, the nodes depend 2 on one another to forward packets to the destinations. The nature of the networks places two fundamental requirements on the routing protocols. First, it has to be distributed. Secondly, since the topology changes are frequent, it should compute multiple, loop-free routes while keeping the communication overheads to a minimum [3]. Ease of Use Ad Hoc on demand distance vector Ad hoc On-Demand Distance vector algorithm provides dynamic, self starting and multi hop routing between the nodes. AODV allows mobile nodes to obtain routes quickly for new destinations, and does not require nodes to maintain routes to destinations that are not in active communication [4]. AODV allows mobile nodes to respond to link breakages and changes in network topology in a timely manner. Types of messages: Route Requests(RREQs) Route Replies(RREPs) Route Errors(REERs)