Finish Procedure NS2 & NAM

The complete process of NS2 and NAM

Before starting the simulation, you need to create a proper topology. This topology includes various nodes, links, and protocols. The following steps can be followed to create a topology:

A script has to be written for the simulation which includes all nodes, connections, and required settings. This script is written in OTcl (Object-oriented Tcl) language for NS2.

Example:

# Start of NS2 script

set ns [new Simulator]

# Creation of nodes

set node1 [$ns node]

set node2 [$ns node]

# Adding connection

$ns connect $node1 $node2

# Data sending process

$ns at 1.0 "$node1 send $node2 10MB"

# Running the simulation

$ns run

When the script is ready, the following command is used to run it:

ns simulation.tcl

This will start the simulation, and it will run for the specified time.

During the simulation, NS2 traces various data, such as packet transfer, latency, throughput, and packet loss. This data is stored in a trace file.

To load the simulation results in NAM, the following command can be used:

nam tracefile.nam

NAM displays the simulation in an animated form in the graphical interface. This allows users to observe the network activities in real-time.

By using NAM, users can analyze various metrics during the simulation. Important metrics include:

Once you have analyzed the results, the next step is to present those results in the form of a report. This report may include the following points:

In the final step, the need for improvement and changes is assessed based on the simulation results. If the results are not as expected, then modifications to the nodes, protocols, or other settings may be required.