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How to Implement Point to Point Topology in ns3

To implement  a point-to-point topology in ns3, we need a direct connection between two nodes using a point-to-point link. Here is a complete guide on implementing point-to-point topology in ns3.

Steps to implement point-to-point topology

  1. Set Up ns3:
    • Make sure that ns3 is installed in the computer. If not, install it.
  2. Create the Nodes:
    • To represent the devices connected by a point-to-point link, create two nodes.
  3. Set Up the Point-to-Point Channels:
    • To configure the link between the nodes, use point-to-point helpers.
  4. Install Network Stack:
    • On both nodes, install the internet stack.
  5. Assign IP Addresses:
    • To the nodes connected to the point-to-point links, assign IP addresses.
  6. Set Up Applications:
    • To generate traffic and demonstrate communication between nodes, install applications.

Example code

Here is an example to set up a basic point-to-point topology in ns3.

#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”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“PointToPointTopologyExample”);

int main (int argc, char *argv[])

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create (2); // Create 2 nodes for the point-to-point link

// Create point-to-point link

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“5Mbps”));

pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));

NetDeviceContainer devices;

devices = pointToPoint.Install (nodes);

// Install the internet stack on nodes

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses to the devices

Ipv4AddressHelper address;

address.SetBase (“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = address.Assign (devices);

// Create a UDP server on node 1

UdpServerHelper udpServer (9);

ApplicationContainer serverApp = udpServer.Install (nodes.Get (1));

serverApp.Start (Seconds (1.0));

serverApp.Stop (Seconds (10.0));

// Create a UDP client on node 0

UdpClientHelper udpClient (interfaces.GetAddress (1), 9); // IP of node 1

udpClient.SetAttribute (“MaxPackets”, UintegerValue (320));

udpClient.SetAttribute (“Interval”, TimeValue (MilliSeconds (50)));

udpClient.SetAttribute (“PacketSize”, UintegerValue (1024));

ApplicationContainer clientApp = udpClient.Install (nodes.Get (0));

clientApp.Start (Seconds (2.0));

clientApp.Stop (Seconds (10.0));

// Enable packet capture

pointToPoint.EnablePcapAll (“point-to-point-topology”);

// Enable logging

LogComponentEnable (“UdpClient”, LOG_LEVEL_INFO);

LogComponentEnable (“UdpServer”, LOG_LEVEL_INFO);

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Explanation

  1. Setup:

Created two nodes and connected by point-to-point links.

  1. Point-to-Point Links:

Point-to-point links are created. The data rate and delay are configured for the links.

  1. Network Stack:

On both nodes, the internet stack is installed.

  1. IP Addresses:

To the nodes, IP addresses are assigned connected by the point-to-point links.

  1. Applications:

On one node (node 1), A UDP server is installed and a UDP client is installed on the other node (node 0) to generate traffic and demonstrate communication.

  1. Packet Capture:

To observe network traffic, packet capture is enabled for the point-to-point links.

  1. Logging:

To provide detailed output during the simulation, logging is enabled for the UDP client and server applications.

Running the Simulation

Compile and run the simulation using the following commands:

./waf configure

./waf build

./waf –run point-to-point-topology-example

Replace point-to-point-topology-example with the actual name of your script file.

On the whole we had a performance analysis on implementing point-to-point topology in ns3 by providing direct connection between two nodes using a point-to-point link. Also, we provide detailed explanation on Point-to-point Topology.

Implementation on Point-to-Point Topology in ns3 where we provide you with best programming results are aided by ns3simulation.com.