A Wireless network it's based on ad-hoc wireless networks, where each node transfers data to the neighbour nodes. AP (Access Point) need not be in the reach of all the nodes in the network. Nodes around the AP forward the packets from the distant nodes to the next node. They can work in a decentralized fashion, are cheap with minimum investment for initial infrastructure, more reliable, scalable and provide increased coverage. The denial of service attacks (DoS) have become more and more frequent and caused some fatal problems in the recent time. Internet users experience Denial of- service (DoS) attacks every day. We are going to present an Analytical approach which will employ Reactive Defence Mechanism to mitigate the DoS attack and further improve network performance in terms of less computation time. The distributed jammer network (DJN) is composed of a large number of tiny, low power jammers distributed inside a target network with the purpose of jamming the target network. Phase change or phase transition uses the percolation theory. In percolation theory nodes are setup using random process. Further the simulation result proves it to be a better result oriented approach.

WN Ad-hoc Network DoS Jammer Access Point