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NS by Example
Jae Chung
and
Mark Claypool
Purpose
NS (version 2) is an object-oriented, discrete event driven network
simulator developed at UC Berkely written in C++ and OTcl. NS is primarily
useful for simulating local and wide area networks. Although NS is fairly
easy to use once you get to know the simulator, it is quite difficult for
a first time user, because there are few user-friendly manuals. Even
though there is a lot of documentation written by the developers which
has in depth explanation of the simulator, it is written with the depth
of a skilled NS user. The purpose of this project is to give a new user
some basic idea of how the simultor works, how to setup simulation networks,
where to look for further information about network components in
simulator codes, how to create new network components, etc., mainly by
giving simple examples and brief explanations based on our experiences.
Although all the usage of the simulator or possible network simulation
setups may not be covered in this project, the project should help a new
user to get started quickly.
Overview
NS is an event driven network simulator developed at UC Berkeley that
simulates variety of IP networks. It implements network protocols such
as TCP and UPD, traffic source behavior such as FTP, Telnet, Web, CBR and
VBR, router queue management mechanism such as Drop Tail, RED and CBQ,
routing algorithms such as Dijkstra, and more. NS also implements
multicasting and some of the MAC layer protocols for LAN simulations. The
NS project is now a part of the VINT project that develops tools for
simulation results display, analysis and converters that convert network
