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
- Set Up ns3:
- Make sure that ns3 is installed in the computer. If not, install it.
- Create the Nodes:
- To represent the devices connected by a point-to-point link, create two nodes.
- Set Up the Point-to-Point Channels:
- To configure the link between the nodes, use point-to-point helpers.
- Install Network Stack:
- On both nodes, install the internet stack.
- Assign IP Addresses:
- To the nodes connected to the point-to-point links, assign IP addresses.
- 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
- Setup:
Created two nodes and connected by point-to-point links.
- Point-to-Point Links:
Point-to-point links are created. The data rate and delay are configured for the links.
- Network Stack:
On both nodes, the internet stack is installed.
- IP Addresses:
To the nodes, IP addresses are assigned connected by the point-to-point links.
- 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.
- Packet Capture:
To observe network traffic, packet capture is enabled for the point-to-point links.
- 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.