Modified AODV Protocol to Prevent Black Hole Attack in Mobile Ad-hoc Network

Abstract

A Wireless ad-hoc network is a temporary network set up by wireless mobile computers (or nodes) moving arbitrary in the places that have no network infrastructure. Since the nodes communicate with each other, they cooperate by forwarding data packets to other nodes in the network. Thus the nodes find a path to the destination node using routing protocols. However, due to security vulnerabilities of the routing protocols, wireless ad-hoc networks are unprotected to attacks of the malicious nodes. One of these attacks is the Black Hole Attack against network integrity absorbing all data packets in the network. Since the data packets do not reach the destination node on account of this attack, data loss will occur. In this research paper we modify the working of AODV routing protocol to prevent black hole attack. So we investigate the performance impact of a blackhole attack on a mobile ad hoc network and compare it with our modified AODV routing protocol. The simulation work is carried out by OPNET Modeler. To analyze performance of our proposed algorithm we use performance metrics ex. Network throughput, network load, packet send and received, packet dropped and end-to-end delay.