DOS Attack Severity on Static and Mobile Adhoc Network

A wireless ad-hoc network is a collection of autonomous nodes that communicate with each other by each node acting as router and maintaining connectivity in a decentralized manner. The network topology is dynamic because the connectivity among the nodes may vary with time due to node departure, new arrivals and the possibility of having mobilenodes. In this paper, weexplore the effect on per session throughput of an adhoc network consisting offixed, and mobile non-maliciousnodes, by mobile and fixed malicious nodes making black hole and wormhole attacks and its severity.To simulate black hole attack 5, 10 and 14 malicious nodes were created for different scenarios, and for worm hole attack only one worm hole link was created.The 50 non-malicious nodes fixed, and mobile networks for cases of mobile and fixed malicious nodes attack were simulated in ns2 where each odd numbered nodetransmits packets to the next even numbered node. Key Terms:Ad-hoc network, Black hole, Worm hole, Data rate, per session throughput.