Abstract: Mobile ad-hoc network is an infrastructure-less network in which the routing operation play important role in route discovery between communicating nodes. Due to infrastructure-less characteristic of ad-hoc network, it has different issues like routing, MAC layer, security etc. One of them is security issue which needs more concern. Vampire attacks modify targeted packets. It does so by preparing long routes or misguiding the packets. Malicious nodes use false messaging, or modify routing information. This action affects the bandwidth and node battery power. Routing as well as network resources gets protection from vampire attack; an approach is proposed to detect malicious routing packets. Present work gives result for different routing based attacks and discusses the issue of a serious resources consumption attack (Vampire Attack). The proposed approach uses the packet monitoring technique to detect malicious packet in the network. Proposed approach considers different network scenarios when using simulation. The basic principle behind the approach is that nodes check the received route request by comparing the packet headerís information (broadcast id and destination address) during route discovery phase and discard the malicious packets. A comparative performance study is performed in requisites of packet delivery ratio, throughput, routing overhead and energy consumption. It is found that Network performance improves as compared to the existing approaches.

Keywords: Security, Algorithm, Wireless ad-hoc network, Routing, Security Issue, Vampire Attack.