Abstract: MANET is a self-organizing and self-configuring network in which mobile nodes communicate with each other with the help of wireless connection. In A mobile ad-hoc network, links between nodes change very quickly because every mobile node in network has a full freedom to move in any direction. There is no need to define the path between any nodes. There are basically three types of protocols used for the communication between the nodes Reactive, Proactive and Hybrid. In this paper routing protocols GRP, OLSR and TORA are compared in Ad-hoc network on the basis of parameters delay, throughput and network delay. In this paper OPNET Modeler 14.5 is used for simulation.

Keywords: MANET,TORA,GRP, OLSR, OPNET,Voice IP Telephony