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Summary Inthe mobile ad hoc network (MANET), the nodes are moving very frequently and they do not have any fixed infrastructure. For reliable data delivery in MANET, we have analyzed the efficiency of data delivery using Position‐based Opportunistic routing method and greedy forwarding technique, which is based on geographic routing method. Initially, the MANET is divided into a number of provinces to identify the location of the receiver, and then Geographic routing is applied on the network for transmission of data. Based on the performance and throughput, the best forwarder node will be identified. Semi Markov process is used to develop the node behavior model for network survivability. In this work, reliable data delivery is obtained for the MANET by estimating the present performance of the network through isolating the forwarder node in Semi Markov process.

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