International forum of researchers Students and Academician
All network simulators (ns-1, ns-2 and ns-3) are discrete-event network simulators. These simulators are used in research and training. The version ns-3 is particularly open source or available for free. ns3 has a key feature of Direct Code Execution (DCE). Simulator is a designed and implemented software program that creates realistic environment that is executed on different operating systems. In this paper, the authors propose various network simulators that are open source and their functionality of working. They get comparative performance between open source networking simulators and other networking simulators.