How to implement network Traffic differentiation in ns3

To implement the network traffic differentiation in ns3 has several steps that has encompasses to setting up the emulation scenarios that describes the various types of traffic and then implement the Quality of Service (QoS) mechanisms. The given below are the complete procedures to help you to achieve this in ns3:

Step-by-Step Implementation:

1. Set Up ns3 Environment

Initially make certain that ns3 is installed in the computer.

2. Create a New Simulation Script

Create a new C++ or Python script for your simulation. For this example, we’ll use C++.

3. Include Necessary Headers

Include the necessary ns3 headers in your script.

#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”

#include “ns3/traffic-control-module.h”

4.      Define the Network Topology

Set up the basic network topology, including nodes, devices, and links.

using namespace ns3;

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

NodeContainer nodes;

nodes.Create (2);

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices;

devices = pointToPoint.Install (nodes);

InternetStackHelper stack;

stack.Install (nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign (devices);

5.      Install Traffic Control and Set Up Queues

Use the Traffic Control module to install different queue disciplines (e.g., FIFO, RED, etc.) and set up queues for traffic differentiation.

TrafficControlHelper tch;

tch.SetRootQueueDisc (“ns3::FifoQueueDisc”, “MaxSize”, StringValue (“100p”));

tch.Install (devices);

6.      Create Traffic Applications

Create applications to generate different types of traffic (e.g., UDP and TCP).

TCP Traffic

uint16_t tcpPort = 9;

Address tcpAddress (InetSocketAddress (interfaces.GetAddress (1), tcpPort));

PacketSinkHelper tcpSink (“ns3::TcpSocketFactory”, tcpAddress);

ApplicationContainer tcpSinkApp = tcpSink.Install (nodes.Get (1));

tcpSinkApp.Start (Seconds (1.0));

tcpSinkApp.Stop (Seconds (10.0));

OnOffHelper tcpClient (“ns3::TcpSocketFactory”, tcpAddress);

tcpClient.SetAttribute (“OnTime”, StringValue (“ns3::ConstantRandomVariable[Constant=1]”));

tcpClient.SetAttribute (“OffTime”, StringValue (“ns3::ConstantRandomVariable[Constant=0]”));

tcpClient.SetAttribute (“DataRate”, DataRateValue (DataRate (“1Mbps”)));

tcpClient.SetAttribute (“PacketSize”, UintegerValue (2000));

ApplicationContainer tcpClientApp = tcpClient.Install (nodes.Get (0));

tcpClientApp.Start (Seconds (2.0));

tcpClientApp.Stop (Seconds (10.0));

UDP Traffic

uint16_t udpPort = 10;

Address udpAddress (InetSocketAddress (interfaces.GetAddress (1), udpPort));

PacketSinkHelper udpSink (“ns3::UdpSocketFactory”, udpAddress);

ApplicationContainer udpSinkApp = udpSink.Install (nodes.Get (1));

udpSinkApp.Start (Seconds (1.0));

udpSinkApp.Stop (Seconds (10.0));

OnOffHelper udpClient (“ns3::UdpSocketFactory”, udpAddress);

udpClient.SetAttribute (“OnTime”, StringValue (“ns3::ConstantRandomVariable[Constant=1]”));

udpClient.SetAttribute (“OffTime”,StringValue(“ns3::ConstantRandomVariable[Constant=0]”));

udpClient.SetAttribute (“DataRate”, DataRateValue (DataRate (“1Mbps”)));

udpClient.SetAttribute (“PacketSize”, UintegerValue (1000));

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

udpClientApp.Start (Seconds (3.0));

udpClientApp.Stop (Seconds (10.0));

7. Run the Simulation

Finally, run the simulation and collect the results.

Simulator::Stop (Seconds (10.0));

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

8. Build and Run the Script

Save the script and build it using the ns3 build system (waf).

./waf configure

./waf build

./waf –run your-script-name

Explanation

• Traffic Control Module: The TrafficControlHelper is used to install a queue discipline (FifoQueueDisc in this case) on the network devices. You can choose different queue disciplines based on your needs (e.g., RED, CoDel).
• Traffic Applications: Two different traffic applications are created, one for TCP and one for UDP. This allows you to simulate different types of traffic and observe how they are handled by the network.

Finally, we understand implementation procedures on network traffic differentiation that has includes to setting up the emulation scenarios then implement the Quality of Service (QoS) mechanisms in the traffic to collect the results using the ns3 tool. We further provide the in-depth information about the network traffic differentiation.

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