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A Mobile Ad-hoc network is an autonomous system of mobile hosts connected by wireless links. A MANET has no infrastructure and no centralized administration. The network topology may dynamically change in an unpredictable manner since nodes are free to move. The operation of the nodes in wireless ad-hoc networks depend on the battery power and have limited energy resources. The loss of some intermediate nodes may cause considerable topological changes, weaken the network operation, and have an effect on the lifetime of the network. This makes energy efficiency a key concern in ensuring system resilience. Energy efficient routing problems are important in MANET dynamic environment. Energy should be optimally utilized so that the nodes will perform their action adequately. Fault tolerance is a significant property of ad-hoc network, which assures the reliability of the resources. In this paper, a novel fault tolerant multi path routing protocol is proposed to reduce the packet loss due to route breakage, which uses a new route discovery and maintenance mechanism. It uses alternative route to retransmit the data whenever an intermediate node does not able to forward it, due to link failure or node failure. The proposed protocol is simulated in NS2and performance is evaluated using packet delivery ratio, end-to-end delay, packet drop, and throughput and energy consumption by varying the pause time, number of flows and traffic rate. Simulation results show that the proposed protocol outperform the existing works in terms of the above metrics.

Achieving Energy Efficiency and Increasing the Network Life Time in MANET through Fault Tolerant Multi-Path Routing