Modified AODV protocol for prevention of Denial of service attacks in wireless Ad hoc networks

In this paper we analyze attacks that deny channel access by causing pockets of congestion in mobile networks. Such attacks would essentially prevent one or more nodes from accessing or providing specific services. Here we focus on the properties of the most commonly used routing protocol, the AODV, which enables such attacks. We propose a new routing protocol which we call as BT_AODV protocol to mitigate these DOS attacks. We make use of Blacklist table method to isolate the malicious node from the network. The malicious node is circumvented at various stages of the routing protocol. In this method the intruder’s node is denied all the services provided by the network. Our analysis and simulation show that providing BT_ AODV protocol with blacklist table method alleviates the effects of such attacks.