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The paper aims to investigate the performance of the TCP variants in MANET and its behavior with respect to different routing protocols. In the performance evaluation two different routing protocols On-Demand Distance Vector (AODV) and Optimized Link State Routing (OLSR) have been considered with three different TCP variants Tahoe, Reno and New-Reno. Different scenarios that can achieve scalability, mobility and http traffic loading investigation in MANET have been considered in the evaluation. Depending on the variables delay and throughput the performances parameters of the routing protocols are graded. Conclusions are drawn based on the evaluation results using OPNET simulator. The results clearly show that the both AODV and OLSR achieve acceptable performance.
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