A Mobile Ad hoc Network (MANET) is an autonomous system of nodes (MSs) (also serving as routers) connected by wireless links. There is no infrastructure exists in a MANET. The network’s wireless topology may change dynamically since nodes are free to move and each node has limited transmitting power. In MANETs two types of packet dropping attacks are present: 1. Gray hole and 2. Black hole. In gray hole attacker node drop part of the data and cheat the previous node and in black hole attacker node drop all data packets and cheat the previous node. This paper proposed mechanism to detect and isolate these attacks in network.
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