Mobile ad hoc networks have great potentials in a wide range of applications. Their inherent vulnerability to various network attacks however limits their wide adaptation and deployment in practice. The present article addresses one of the most dangerous attacks, the packet drop attack in a clustered environment. The nodes that selflessly and honestly forward the packets of other’s are awarded with increase in reputation, sometimes cluster-wide, whereas if a malicious node is caught red-handed then it is blacklisted network-wide. A blacklisted node becomes isolated forever. On the other hand, if packet drop attack of a node cannot be proved, then its reputation is decreased depending upon its earlier behavior, residual energy as per the most recent record of the clusterhead and number of packets yet to be transmitted through the route. Strength of the proposed protocol has been studied w.r.t. link breakage, topological or due to death of a node or malicious packet drop. Numeric results show that it is very effective in various network scenarios compared to other state-of-the-art packet drop detection techniques.

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