NS2/NS3 is an open-source simulation tool that runs on Linux. It is a discreet event simulator targeted at networking research and provides substantial support for simulation of routing, multicast protocols and IP protocols, such as UDP, TCP, RTP and SRM over wired and wireless (local and satellite) networks. It has many advantages that make it a useful tool, such as support for multiple protocols and the capability of graphically detailing network traffic. Additionally, NS2/NS3 supports several algorithms in routing and queuing. LAN routing and broadcasts are part of routing algorithms. Queuing algorithms include fair queuing, deficit round-robin and FIFO.
Due to its flexibility and modular nature, NS2 has gained constant popularity in the networking research community since it birth in 1989 ever since several revolutions and revisions have marked the growing maturity of the tool, thanks to substantial contributions from the players in the field. Among these are the University of California and Cornell University who developed the REAL networks simulator the foundation on which NS is invented since 1995 the Defense Advanced Research Projects Agency (DARPA) supported the development of the NS through the Virtual internetwork test bed (VINT) project. Currently the National Science Foundation (NSF) has joined the ride in development last but not the least the group of researcher and developers in the community are constantly working to keep NS2 strong and versatile.
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