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NS-3 Guide for Network Researchers

The document provides an overview of the Network Simulator 3 (NS-3). It describes NS-3's differentiation from NS-2 in terms of programming language and community support. The document outlines NS-3's software organization, key features, available modules, installation process, abstractions, and output processing utilities. Ideas for developing projects in NS-3 are also presented, such as simulating new protocols, WiFi examples, improving routing protocols, and analyzing campus networks.

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nityakulkarni
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118 views17 pages

NS-3 Guide for Network Researchers

The document provides an overview of the Network Simulator 3 (NS-3). It describes NS-3's differentiation from NS-2 in terms of programming language and community support. The document outlines NS-3's software organization, key features, available modules, installation process, abstractions, and output processing utilities. Ideas for developing projects in NS-3 are also presented, such as simulating new protocols, WiFi examples, improving routing protocols, and analyzing campus networks.

Uploaded by

nityakulkarni
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© © All Rights Reserved
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Department of Computer Science and Engineering

BVBCET, Hubli

Overview of
Network Simulator (NS-3)
By
Nitya N. Kulkarni
Mrutyunjay G. Hiremath

Under the Guidance of


Prof. Jayalakshmi G. Naragund
2

Contents
 Introduction
 Differentiating NS-2 and NS-3
 Software organization of NS3
 Features of NS-3
 Modules available in NS-3
 Easy Steps to Install NS-3
 Key Abstractions
 Output Processing Utilities
 Ideas for Project Development
3

Introduction
• Research projects can be implemented in either one or more of
these;
– Mathematical modeling
– Simulation
– Experimentation using TestBeds
• Most researchers go for simulation as they imitate real time
situations and enable execution of even complex ideas simple
through tools called Simulators.
• Network simulator is a software that predicts the behavior of
the computer network.
• NS3 is a new simulator written from scratch. Not an evolution
of NS-2.
• Project started around mid 2006 and still under heavy
development.
4

Differentiating NS-2 and NS-3


• The Choice of Programming Language:
OTcl in ns-2, C++ in ns-3

1. Not possible to run a simulation in ns-2 purely from C++.

2. Some components in ns-2 are written in OTcl and some in C++.

3. Simulations in ns-3 can be run using purely C++ or in Python.

4. Components in ns-3 are completely written in C++.


5

• NAM and Trace files in NS-2, NetAnim and PCAP Trace files
in NS-3.

• Community Support

Very good for ns-2, Improving for ns-3


1. ns2 has a more diverse set of contributed modules than does ns3.

2. A lot of documentation exists for ns-2

3. ns-3 has more detailed models for upcoming networks like Long
Term Evolution (LTE), Wi-Fi, etc.
6

Software Organization of NS3

Test

Helper

Protocols Applications Devices Propagation ...

Internet Mobility

Network

Core
7

Features of NS-3
• It is a discrete event simulator.

• Modular design / Open source.

• Logging facility for debugging.

• Tracing facility for getting output.

• Developed in C++, Python binding available.

• Live visualizer.

• Direct Code Execution.


8

Modules Available in NS-3


9

Installation of NS3
• Latest release: ns-allinone-3.23, http://www.nsnam.org/
• Pre-Requisites:
– GCC-C++, Python-dev

– Mercurial, Qt4-devel

• Downloading and installation of NS-3


– BAKE

– Manual Installation

• waf configuration and building NS3


10

Key Abstractions
• Node

• Application (e.g., FTP, ON-OFF Traffic, etc)

• Channel (e.g., point-to-point, etc)

• NetDevice (i.e., Network Interface Card (NIC))

• Packet

• Topology Helpers
11

Conceptual Overview
12

Output Processing Utilities


• Netanim

• Pcap files using Wireshark

• GNU plot
13

NetAnim
14

Wireshark
15

GNU Plot
16

Ideas for Project Development


• New BackOff Procedure.

• Wifi rate control example.

• Improve some of the routing protocols to adhere to the


standard.

• Simulate your college campus network and analyze its


performance against the real time results.

• Projects related to LTE.

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