Network simulation is a method of investigation in network technology. Along the way of investigating a new technology, scheduled to various reasons, it is costly and unrealistic to actually test a network system. In such situation, simulation becomes one of the better available alternatives in testing, analysis and validation. Network simulation gets the features of small circuit and low priced, and it is easier for researchers to use other's research, in order to concentrate on this part and no need to spend a lot of time on other area of the system. NS2 is a simulation program that is developed in free open up source for network solutions. Researchers can certainly put it to use for the introduction of network technology. Until today, NS2 contains rich modules that are almost related to all or any areas of network technology.