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mobile ad-hoc networks are vulnerable to Denial of Service (DoS) attacks. MANET has features like self organizing, working as router as well as host having dynamic topology. In MANET, nodes have limited resources like bandwidth, battery power and storage capacity. Gray hole attack is a kind of denial of service (DoS) attack in mobile ad hoc networks. It is specialized type of black hole attack which changes its state from honest to malicious and vice versa. Gray hole attack is an event that degrades the overall network's performance by intentional malicious activity. In this paper, it is proposed the mechanism against gray hole attack and improves the network performance interms of throughput, packet drop rate, packet delivery ratio and normalized routing overhead.

A Mechanism for Gray Hole Attack Detection in Mobile Adhoc Networks