A Survey on Modified approach to detect and prevent Grayhole attack in MANET

Networking

Mobile Ad hoc Network (MANET) has distributed mobile wireless nodes, which do not have pre-determine topology and pre-existing infrastructure mobile nodes that can arbitrarily change their geographic locations and random mobility with constrained resources, ad hoc networks are vulnerable due to their structure less property. During the Grayhole attack, a Grayhole is a node that selectively drops and forwards data packets after advertises itself as having the shortest path to the destination node in response to a route request message. In these proposed detection mechanisms for In this paper we represent a mechanism which is helpful for prevention of gray hole attack, through observing the delay of different path to receiver and verification using authentication approach. Our mechanism helps to protect the network by detecting and reacting to malicious activities of any node. The results enable us to minimize the attacks on integrated MANET-Internet communication efficiently. Simulation will be carried out by using network simulator tool so as to address the problem of detection & prevention of gray hole attack in mobile ad-hoc network.

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