How to Start Point-to-Multipoint Topology Projects using NS3

Starting a Point-to-Multipoint Topology Project in NS-3

To create a Point-to-Multipoint (P2MP) topology has includes the one central node such as a server, base station, or gateway connected to various other nodes like as clients or access points through individual point-to-point connections. Here’s on how to configure and replicate a P2MP topology in NS-3.

Steps to Start Point-to-Multipoint Topology Projects using NS3

Step 1: Set Up NS-3

  1. Install NS-3:
    • Download NS-3.
    • Observe the installation process.
  2. Verify Installation: Validate the setting with a basic script:

./waf –run scratch/my_first

Step 2: Understand Point-to-Multipoint Topology

  • P2MP Topology:
    • The one central node connects the various child nodes used in dedicated connections.
    • Common use cases: Transmission from a server to different clients or base station the multiple devices.

Step 3: Set Up the Point-to-Multipoint Topology

  1. Create Nodes: Describe the central node and the child nodes.

NodeContainer centralNode;

centralNode.Create(1); // Create the central node

NodeContainer childNodes;

childNodes.Create(5); // Create 5 child nodes

  1. Set Up the Point-to-Multipoint Links: Utilized the PointToPointHelper we state the individual connections.

PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, StringValue(“10Mbps”));

p2p.SetChannelAttribute(“Delay”, StringValue(“2ms”));

  1. Connect Central Node to Each Child Node: Designed for every child node it connects to the central node.

NetDeviceContainer devices;

for (uint32_t i = 0; i < childNodes.GetN(); ++i) {

NetDeviceContainer link = p2p.Install(centralNode.Get(0), childNodes.Get(i));

devices.Add(link);

}

  1. Install Internet Stack: Install the Internet stack on all nodes.

InternetStackHelper stack;

stack.Install(centralNode);

stack.Install(childNodes);

  1. Assign IP Addresses: Allocate the IP addresses to all interfaces.

Ipv4AddressHelper address;

for (uint32_t i = 0; i < childNodes.GetN(); ++i) {

std::ostringstream subnet;

subnet << “192.168.” << i + 1 << “.0”;

address.SetBase(subnet.str().c_str(), “255.255.255.0”);

address.Assign(devices.Get(i));

}

Step 4: Set Up Applications

  1. Server Application: Install a UDP echo server on the central node.

UdpEchoServerHelper echoServer(9); // Port 9

ApplicationContainer serverApp = echoServer.Install(centralNode.Get(0));

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

  1. Client Applications: Install UDP echo clients on the child nodes.

for (uint32_t i = 0; i < childNodes.GetN(); ++i) {

UdpEchoClientHelper echoClient(Ipv4Address(“192.168.1.1”), 9); // Server’s IP

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

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

ApplicationContainer clientApp = echoClient.Install(childNodes.Get(i));

clientApp.Start(Seconds(2.0));

clientApp.Stop(Seconds(10.0));

}

Step 5: Run and Analyze

  1. Run the Simulation:

Simulator::Run();

Simulator::Destroy();

  1. Enable Packet Capture: Seizure their packets for analysis using .pcap files.

p2p.EnablePcapAll(“point_to_multipoint”);

  1. Trace Logs: Ensure the NS-3 logging for debugging.

export NS_LOG=”UdpEchoClientApplication=level_all|prefix_func”

./waf –run scratch/point_to_multipoint_topology

Example: Minimal NS-3 Script for Point-to-Multipoint Topology

#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;

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

// Create central and child nodes

NodeContainer centralNode;

centralNode.Create(1);

NodeContainer childNodes;

childNodes.Create(5);

// Set up Point-to-Point links

PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, StringValue(“10Mbps”));

p2p.SetChannelAttribute(“Delay”, StringValue(“2ms”));

// Connect central node to child nodes

NetDeviceContainer devices;

for (uint32_t i = 0; i < childNodes.GetN(); ++i) {

NetDeviceContainer link = p2p.Install(centralNode.Get(0), childNodes.Get(i));

devices.Add(link);

}

 

// Install Internet stack

InternetStackHelper stack;

stack.Install(centralNode);

stack.Install(childNodes);

// Assign IP addresses

Ipv4AddressHelper address;

for (uint32_t i = 0; i < childNodes.GetN(); ++i) {

std::ostringstream subnet;

subnet << “192.168.” << i + 1 << “.0”;

address.SetBase(subnet.str().c_str(), “255.255.255.0”);

address.Assign(devices.Get(i));

}

// Set up UDP echo server on central node

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApp = echoServer.Install(centralNode.Get(0));

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

// Set up UDP echo clients on child nodes

for (uint32_t i = 0; i < childNodes.GetN(); ++i) {

UdpEchoClientHelper echoClient(Ipv4Address(“192.168.1.1”), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

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

 

ApplicationContainer clientApp = echoClient.Install(childNodes.Get(i));

clientApp.Start(Seconds(2.0));

clientApp.Stop(Seconds(10.0));

}

// Enable packet capture

p2p.EnablePcapAll(“point_to_multipoint”);

// Run the simulation

Simulator::Run();

Simulator::Destroy();

return 0;

}

Step 6: Compile and Run

  1. Save the script as point_to_multipoint_topology.cc.
  2. We compile and run it:

./waf –run point_to_multipoint_topology

Step 7: Enhance the Simulation

  • Experiment with Traffic Models:
    • Utilized their TCP instead of UDP.
    • Replicate the other congestion kinds such as FTP or HTTP.
  • Analyze Performance:
    • Calculate the parameter metrics such as delay, throughput, and jitter.
  • Simulate Failures:
    • Enhance the connection failures or delays to study resilience.
  • Visualize:
    • Utilized their NetAnim we show the topology and traffic flow.

Next Steps

  • Scale Up:
    • Enhance the more child nodes and subnets.
  • Combine Topologies:
    • Utilized the Point-to-Multipoint links in hybrid or hierarchical topologies.
  • Test Protocols:
    • Validate the routing protocols such as AODV, OLSR in a wireless P2MP configuration.

Make use of the provided steps and instructions which make it easier for you to focus on the implementation of Point-to-Multipoint Topology using NS3 tool that has included to build a network topology then apply the routing protocol and visualized the outcomes. If you need more data regarding this process, we will provide it.

Please contact us at phdprojects.org by sending a message. Simply provide us with the details of your project, and we will assist you in exploring the best simulation and Point-to-Multipoint Topology topics.