Peer-to-peer (P2P) network is a decentralized and self organized architecture for the sharing of resources such as files. P2P network on wired network (Internet) has been extensively studied. The advancement in the wireless and mobile technology has lead to the deployment of the P2P file sharing on mobile ad hoc networks (MANETs). The direct deployment of wired P2P network would result in poor performance for mobile ad hoc networks due to node mobility which causes link failure. In this paper we propose an approach based on route lifetime for P2P network on mobile ad hoc networks. With this approach the life is retrieved on the route of maximum lifetime, the more stable one, instead of the shortest (first acquired path) one, as used in current P2P network[9, 14]. This would reduce the link failure, and thus can decrease routing overhead and end-to-end delay, and increase the file delivery ratio. The route lifetime is determined by the context information, such as velocity and inter-node distance. Simulation results show that our approach in comparison with the ORION [9] performs better in term of file delivery ratio, routing overhead and average end-to-end delay.
