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Introduction to NS2

                  Network simulators are used to simulate behavior of network on a simulator. Simulation is a process in which an entire system is made functional in a hypothetical manner with the help of simulation tool. NS2 is also one such simulation tool but its not just another simulator. It is used across the globe and is available free of cost. Although in initial stages it might feel as a hard bone but a little hard work and guidance can make you master of NS2 in no time.

NS2 Installation

It can be used on Linux/Unix systems and also on Windows based systems(with the help of CygWin). Installation on Linux and Unix is almost same and need no extra tool to run NS2, but for a Windows based system Cygwin is needed along with huge number of files. So if you have both options to work on Linux based or Windows based system, I will advise you to go for Linux based system.
       NS2 comes with a huge collection of protocols that are used in different kind of networks, different scenarios in real life. For example a standard NS2 package comes with TCP,CBR supporting FTP,UDP and many more. 

NS2's Strength

NS2 is a network simulator that lets researchers to simulate wired as well as wireless network. You can simulate network with static nodes as well as dynamic nodes such as MANET networks. It also lets users to monitor network behaviour.
          On top of this it allows users to design their own new protocols and these protocols can easily be used with already existing code. NS2 support TCL and Object Oriented TCL for simulation. If implementation is needed C++ code can be used along with TCL/OTCL.