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Secure group communication is a challenging task with respect to MANET's. Since its introduction as a communication medium, wireless technology found broad application on the battlefield. Robust and reliable group communication plays a major role in developing distributed mobile application in which unannounced disconnections will occur frequently due to the mobility of the nodes which take part in mobile applications. Accompanying dramatic advances in wireless technology and the capabilities associated with small computing devices, the demand for advanced mechanisms to employ wireless technology in the battlefield continues to grow. The main objective here is to achieve robust and reliable group communication in mobile ad hoc network .Performance of the group communication is compared with the given protocols through simulation in NS-2. The analysis is made with respect to the throughput, packet transmission between source and destination. We propose four Ad hoc Routing Protocols AODV, DSR, TORA and OLSR. Keywords: Mobile ad hoc networks; group communication system; reliable communication; guarantee protocol.these requirements and posit that these interactions create the bulk of the complexity involved secure battlefield communication. B. Group communication on the battlefield.Modern battlefield doctrine is based on mobility, flexibility and rapid response to changing situations, yet also requires close coordination and mutually understood objectives among all members of the [command] group. This demands a group communication paradigm.

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In this paper, we present a comparative performance of six multicast protocols for mobile ad hoc networks-BEMRP, MZRP, MCEDAR, ODMRP, DCMP, and FGMP focusing on the effects of changes such as the increasing number of receivers or sources and increasing the number of nodes. Although some simulation results of MANET protocols have been published before, these six protocols have not been compared in isolation. In recent years, a number of new multicast protocols have been proposed for ad hoc networks. Due to the limited transmission range of wireless mobile nodes, multiple network hops may be required for one node to exchange the data with another across the network. Multicasting is an efficient method for implementing group communications. But, it is difficult to achieve this, due to the difficulty in group membership management over a dynamic topology. A systematic performance evaluation of these protocols is done by performing certain simulations under NS-2.