Node Creation of NS2 & NAM

NS2 is an open-source network simulator that allows simulating various networking protocols, topologies, and communication methods. It has been developed using C++ and OTcl (Object Tcl).

To create nodes in NS2, first we need to write a script in which we define the number of nodes, their types, and the relationships between them. Here is a simple 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

In this script:

NAM (Network Animator) is a graphical tool that works with NS2, which is used to see the animation of a network simulation. NAM graphically displays the nodes and their connections during the simulation.

To use NAM, you first need to run the NS2 simulation, and then open NAM and load that simulation file.

nam tracefile.nam

In NAM, nodes are displayed with different sizes and colors, which helps the user to understand which nodes are active in the network and how they are interacting.