Improved AODV Performance in DOS and Black Hole Attack Environment

Abstract

A mobile Ad hoc network has been constructed as virtual backbone or spine of wireless medium. Due to nomadic habit of the node, MANET network are easily establish to a group of nodes with self configuring manner. MANET is simple to set and has changing Topology. Routing in a MANET is a particularly challenging task compared to a conventional network. For data transfer in MANET one of the most commonly used routing protocol is Ad hoc on demand distance vector (AODV), where routes provide on demand and node act as router. It’s performance is based on the services of the network, however MANET are vulnerable to attacks due to it’s dynamic, nomadic and open environment. However, network is vulnerable to the attacks by presence of malicious nodes. DOS and Black Hole attacks are two security threats in AODV.DOS attacks aims to disrupt the service provided by network or server by continuously sending unwanted packets using malicious node. In Black hole attack, the aim of this attack to capture the path and send fake route reply message and routing information. So to overcome from these consequences we propose an algorithm which introduce a mechanism of DOS and Black hole attacks prevention and check network performance in malicious environment on the analysis of throughput and end to end delay.