NS3 Network Simulator:

NS3 Network Simulator is a discrete event-driven simulator widely used for simulating internet systems. It is mainly developed for research and educational purposes. The primary goal of NS3 is to provide a flexible environment for network simulation and protocol testing.

NS3 Simulation:

The NS3 simulation framework helps in simulating realistic models, which can also be used as emulators. NS3 supports both IP and Non-IP based simulations, making it highly versatile for academic and research projects.

NS3 Network Simulator Features:

The major features of NS3 include:

• High scalability for large-scale simulations
• Optimized IPv4 node creation (no memory waste)
• Mobility models (optional or defined based on scenario)
• Cross-layer simulation support
• Flexible architecture with modular libraries

NS3 Simulator Example:

Helper Object:

With the Point-to-Point Helper object, you can create network topologies, define data rates, and set transmission delays for channels. This makes it easy to configure basic network models in NS3.

Steps to Write a Simple NS3 Code:

1. Header Files:

All NS3 library files are included from the ns3 directory. Example:

#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/internet-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/applications-module.h"

2. Logging:

Use NS_LOG_COMPONENT_DEFINE to enable or disable logging:

NS_LOG_COMPONENT_DEFINE ("ExampleSimulation");

3. Main Function:

The simulation begins with:

int main(int argc, char *argv[]) {
    // simulation code here
}

4. Creating Nodes:

Nodes are created using the NodeContainer class:

NodeContainer nodes;
nodes.Create(20);

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