A Mobile Ad hoc Network (MANET) is a collection of mobile nodes which collaborate in forwarding packets in a multi-hop fashion without any centralized management. Finding the malicious node in MANETs is one of its key challenges. MANETs is in danger from different kind of security attacks such as worm hole, black hole, gray hole, rushing attack etc are not enough. Grayhole attack is likely to degrade the network performance due to its misbehavior. This leads to introduction of defense mechanism for the MANETs, Which detect the grayhole node in the network and prevent from it. This paper demonstrates a generic survey of some defense mechanism for MANET.
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