Network Simulation Using Nctuns

1. Introduction: Network simulator is software which is very helpful tool to develop, test, and diagnose any network protocol. To implement any kind of network with any kind of link bandwidth, propagations delay, routers etc we do not need to set up the actual network hence it is very economical and the results obtained are easier to analyze. A simulator needs to simulate various networking devices, application programs, network utility programs hence developing a simulator need great efforts.
To overcome some of the limitation of traditional simulators S.Y. Wang proposed a simulation methodology which has two desirable properties as follows.
•    It uses the real-life UNIX TCP/IP protocol stack, real-life network application programs, and real-life network utility programs.  To generate more accurate result similar to real life implementation..
•    Second, it lets the system default UNIX POSIX API (i.e., the standard UNIX system call interface), be provided on every node in a simulated network. Any real-life UNIX
•    application program, either existing or to be developed, thus can run normally on any node in a simulated network to generate traffic.[1]

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