How to Implement Network in ns2

To implement the network in Network Simulator 2 (ns2) requires a several steps from writing a simulation script in Tcl (Tool Command Language) to executing the simulation and evaluating the outcomes. Below is a step-by-step guide on how to implement a basic network using ns2:

Step-by-Step Implementation:

Step 1: Install ns2

Make certain that you have ns2 installed on your computer before processing. You can download it from the official website or install it using package managers if you’re on Linux.

Step 2: Write a Tcl Script

Generate a new file with a .tcl extension (for instance: network_simulation.tcl). This file will comprise the Tcl script that states the network topology, traffic patterns, and simulation parameters.

Example Tcl Script

# Create a simulator object

set ns [new Simulator]

# Open a trace file for recording the simulation data

set tracefile [open out.tr w]

$ns trace-all $tracefile

# Open a NAM file for visualizing the simulation

set namfile [open out.nam w]

$ns namtrace-all $namfile

# Define a finish procedure to close the files at the end of the simulation

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exec nam out.nam &

exit 0

}

# Create two nodes

set n0 [$ns node]

set n1 [$ns node]

# Create a duplex link between the nodes with a bandwidth of 1 Mbps and a delay of 10ms

$ns duplex-link $n0 $n1 1Mb 10ms DropTail

# Set up a TCP connection between the nodes

set tcp [new Agent/TCP]

$ns attach-agent $n0 $tcp

set sink [new Agent/TCPSink]

$ns attach-agent $n1 $sink

$ns connect $tcp $sink

# Create a traffic source to generate data

set ftp [new Application/FTP]

$ftp attach-agent $tcp

$ftp set type_ FTP

$ftp start

# Schedule the simulation end time

$ns at 5.0 “finish”

# Run the simulation

$ns run

Step 3: Run the Tcl Script

To execute the Tcl script, open a terminal, navigate to the directory where your script is stored, and use the below command:

ns network_simulation.tcl

It will create an output trace file (out.tr) and NAM (Network Animator) file (out.nam). it can be opened with the nam tool to visualize the simulation.

Step 4: Analyze the Output

Use AWK, Perl scripts or other tools to evaluate the trace file (out.tr) and to abstract helpful metrics involves packet delivery ratio, throughput, delay and so on.

Step 5: Visualize with NAM

To visualize the network simulation, use the following command:

nam out.nam

This will exposed the NAM GUI, where you can see the network topology and the movement of packets amongst nodes.

Step 6: Modify and Extend the Simulation

Attach more nodes, vary traffic patterns, present various routing protocols or mimic several kinds of networks (such as wireless, sensor networks) by altering the script.

The procedure on how to implement network using Network Simulator 2 (ns2) has only few steps that is we have to install ns2 and implement the Tcl and then execute it to analyze their results and lastly, you can also modify and expand the simulation. If needed, we will offer the additional details regarding networks using another simulation.

To receive the best support and implementation advice for your Network projects utilizing ns2, contact ns2project.com. Our expertise lies in creating simulation scripts in Tcl (Tool Command Language) tailored to your specific needs. Please share the details of your project with us, and we will be pleased to provide you with the most effective guidance