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Mobile Ad hoc NETwork (MANET) is self configuring network of mobile node connected by wireless links and considered as network without infrastructure. Routing protocol plays a crucial role for effective communication between mobile nodes and operates on the basic assumption that nodes are fully cooperative. Because of open structure and limited battery-based energy some nodes (i.e. selfish or malicious) may not cooperate correctly. After becoming part of active path, theses nodes start refusing to forward or drop data packets thereby degrades the performance of network. In this paper, a new reputation based approach is proposed that deals with such routing misbehavior and consists of detection and isolation of misbehaving nodes.
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