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Mobile ad-hoc network (MANET) is a collection of mobile nodes that wirelessly cooperate with each other without the support of any fix infrastructure and they have different characteristics from wired networks. In such cooperative network, it is essential for one mobile node to support other node in forwarding a packet to its destination. However, due to the open wireless structure of MANETs, routing misbehavior may exist due to the presence of malicious nodes in the network. Malicious nodes may receive data from other nodes but might refuse to share their resources with neighbour nodes. Thus, there is a need to detect the presence of malicious nodes in the network. In this paper, we propose a new intrusion detection protocol, called E-TwoAck scheme, which does not discard the route when a malicious node is detected rather it sends the data packet twice again on the same route and waits for an …