Performance evaluation of TCP variants under different node speeds using OPNET simulator

A mobile ad-hoc network (MANET) is a self starting dynamic network comprising of mobile nodes, where each and every participant node voluntarily transmit the packets destined to some remote node using wireless (radio signal) transmission. Past research efforts have denoted the problematic behaviour of traditional TCP agents in MANET environments and have proposed various remedies across the networking stack. However, there has not been performance evaluation of different TCP agents under varying mobility conditions which takes into account past experiences in MANET evaluation. In this paper we do performance evaluation of various TCP variants viz Tahoe, Reno, New reno and SACK under varying node speed using simulation tool OPNET and evaluate its effect on Throughput, End to end delay, FTP download response time and FTP upload response time.