Detection Of Malicious Node In MANET Under AODV Protocol Over CBR

An Ad Hoc network is a collection of mobile nodes which dynamically forms a temporary network without the use of any existing network infrastructure or centralized administration. In mobile Ad Hoc network, each mobile node acts as a host as well as a router. These nodes communicate to each other by Hop – to – Hop communication. AODV is a prominent on-demand reactive routing protocol for mobile Ad Hoc networks. But in existing AODV, there is no security provision against a well-known malicious attack. This type of attack is called cooperative “Black Hole� attack. This paper includes the behavior of the Black Hole node studied by considering different scenarios. Performance of the Black Hole ADOV protocol has been analyzed by varying the number of mobile nodes and black hole nodes. These black hole nodes participate in the network actively and degrade the performance of network eventually. This method first detects a “Black Hole� attack and then gives a new route by passing this node. In this thesis; an attempt has been made to compare the performance of original AODV and modified AODV in the presence of multiple black hole nodes on the basis of throughput and packet delivery ratio.