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Initially TCP was designed with the notion in mind that wired networks aregenerally reliable and any segment loss in a transmission is due to congestionin the network rather than an unreliable medium (The assumptions is that thepacket loss caused by damage is much less than 1 percent) . This notion doesnthold in wireless parts of the network. Wireless links are highly unreliable andthey lose segments all the time due to a number of factors. Very few papers areavailable which uses TCP for MANET. In this paper, an attempt have been made tojustify the use of TCP variants (Tahoe and Reno) for loss of packet due torandom noise introduces in the MANET. For the present analysis the simulationhas been carried out for TCP variants (Tahoe and Reno) by introduces 0, 10, 20and 30 percent noise. The comparison of TCP variants is made by runningsimulation for 0, 10, 20 and 30 percent of data packet loss due to noise in thetransmission link and the effect of throughput and congestion window has beenexamined. During the simulation we have observed that throughput has beendecreased when a drop of multiple segments happens, further we have observed inthe case of TCP variant (Reno) throughput is better at 1 percent (Figure 5)which implies a network with short burst of error and low BER, causing only onesegment to be lost. When multiple segments are lost due to error prone natureof link, Tahoe perform better than Reno (Figure 13), that gives a significantsaving of time (64.28 percent) in comparison with Reno (Table 4). Severalsimulations have been run with ns 2 simulator in order to acquire a betterunderstanding of these TCP variants and the way they perform their function. Weconclude with a discussion of whether these TCP versions can be used in MobileAd hoc Network.

Impact of Random Loss on TCP Performance in Mobile Ad hoc Networks (IEEE 802.11), A Simulation-Based Analysis