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MANET is a cooperative network in which nodes are responsible for forwardingas well as routing. Noncooperation is still a big challenge that certainlydegrades the performance and reliability of a MANET. This paper presents anovel methodology to overcome routing misbehavior in MANET using RetaliationModel. In this model node misbehavior is watched and an equivalent misbehavioris given in return. This model employs several parameters such as number ofpackets forwarded, number of packets received for forwarding, packet forwardingratio etc. to calculate Grade and Bonus Points. The Grade is used to isolateselfish nodes from the routing paths and the Bonus Points defines the number ofpackets dropped by an honest node in retaliation over its misconducts. Theimplementation is done in "GloMoSim" on top of the DSR protocol. We obtained upto 40% packet delivery ratio with a cost of a minimum of 7.5% overhead comparedto DSR. To minimize total control traffic overhead we have included the FGModel with our model and it reduces the overhead up to 75%. This model enforcescooperation due to its stricter punishment strategy and justifies its name.

A Novel Methodology to Overcome Routing Misbehavior in MANET using Retaliation Model