How to Implement Network Traffic Analysis in ns3

To implement the network traffic analysis in ns3 has numerous steps to follow initially we need to setup the simulation then generate the traffic after that gather and evaluate the traffic data using numerous tools that were provided by ns3 tool.

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Here, we provide the detailed procedures on how to implement the network traffic analysis in ns3:

Step-by-Step Implementation:

Step 1: Setup ns3 Environment

Make certain ns3 is installed and set up on your system.

Step 2: Include Necessary Modules

Include the necessary ns3 modules 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/flow-monitor-module.h”

Step 3: Create the Simulation Script

  1. Setup Nodes and Network:

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkTrafficAnalysis”);

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

{

// Enable logging

LogComponentEnable (“UdpEchoClientApplication”, LOG_LEVEL_INFO);

LogComponentEnable (“UdpEchoServerApplication”, LOG_LEVEL_INFO);

// Create nodes

NodeContainer nodes;

nodes.Create (4);

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices;

devices = pointToPoint.Install (nodes.Get (0), nodes.Get (1));

devices = pointToPoint.Install (nodes.Get (1), nodes.Get (2));

devices = pointToPoint.Install (nodes.Get (2), nodes.Get (3));

// Install Internet stack

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign (devices);

// Populate routing tables

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

// Set up applications

UdpEchoServerHelper echoServer (9);

ApplicationContainer serverApps = echoServer.Install (nodes.Get (3));

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (20.0));

UdpEchoClientHelper echoClient (interfaces.GetAddress (3), 9);

echoClient.SetAttribute (“MaxPackets”, UintegerValue (1000));

echoClient.SetAttribute (“Interval”, TimeValue (Seconds (0.01)));

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

ApplicationContainer clientApps = echoClient.Install (nodes.Get (0));

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (20.0));

// Flow monitor

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll ();

Simulator::Stop (Seconds (20.0));

Simulator::Run ();

// Print flow monitor statistics

monitor->SerializeToXmlFile (“flowmon-results.xml”, true, true);

Simulator::Destroy ();

return 0;

}

Step 4: Run the Simulation

Compile and run your simulation script:

./waf configure

./waf build

./waf –run NetworkTrafficAnalysis

Explanation:

  • Node Creation: Create nodes representing devices in the network.
  • Point-to-Point Links: Configure point-to-point links between nodes.
  • Internet Stack: Install the Internet stack on all nodes.
  • IP Configuration: Assign IP addresses to the nodes.
  • Routing Tables: Populate the global routing tables.
  • Applications: Use UDP Echo server and client applications to simulate data transmission.
  • Flow Monitor: Use the flow monitor to collect data on packet loss, delay, throughput, etc.

Advanced Traffic Analysis Techniques

  1. Custom Traffic Generators: You can use different applications like OnOffApplication or BulkSendApplication to generate custom traffic patterns.

OnOffHelper onoff (“ns3::UdpSocketFactory”, Address (InetSocketAddress (interfaces.GetAddress (3), 9)));

onoff.SetConstantRate (DataRate (“1Mbps”));

ApplicationContainer app = onoff.Install (nodes.Get (0));

app.Start (Seconds (2.0));

app.Stop (Seconds (20.0));

PacketSinkHelper sink (“ns3::UdpSocketFactory”, Address (InetSocketAddress (Ipv4Address::GetAny (), 9)));

app = sink.Install (nodes.Get (3));

app.Start (Seconds (1.0));

app.Stop (Seconds (20.0));

Tracing and Logging: Enable tracing to capture detailed packet-level information.

AsciiTraceHelper ascii;

pointToPoint.EnableAsciiAll (ascii.CreateFileStream (“network-traffic.tr”));

Using the Flow Monitor:  Configure the flow monitor is to capture more detailed statistics.

monitor->CheckForLostPackets ();

Ptr<Ipv4FlowClassifier> classifier = DynamicCast<Ipv4FlowClassifier> (flowmon.GetClassifier ());

std::map<FlowId, FlowMonitor::FlowStats> stats = monitor->GetFlowStats ();

for (std::map<FlowId, FlowMonitor::FlowStats>::const_iterator i = stats.begin (); i != stats.end (); ++i)

{

Ipv4FlowClassifier::FiveTuple t = classifier->FindFlow (i->first);

NS_LOG_UNCOND (“Flow ” << i->first << ” (” << t.sourceAddress << ” -> ” << t.destinationAddress << “)”);

NS_LOG_UNCOND (”  Tx Packets: ” << i->second.txPackets);

NS_LOG_UNCOND (”  Tx Bytes:   ” << i->second.txBytes);

NS_LOG_UNCOND (”  TxOffered:  ” << i->second.txBytes * 8.0 / 19.0 / 1024 / 1024  << ” Mbps”);

NS_LOG_UNCOND (”  Rx Packets: ” << i->second.rxPackets);

NS_LOG_UNCOND (”  Rx Bytes:   ” << i->second.rxBytes);

NS_LOG_UNCOND (”  Throughput: ” << i->second.rxBytes * 8.0 / 19.0 / 1024 / 1024  << ” Mbps”);

}

Analysing Results: After running the simulation, we need to evaluate the results using tools like Python or MATLAB to parse the flow monitor XML file and generate detailed reports and graphs.

We had clearly explained how to analyse, gather and implement the traffic data by using the ns3 tool and also we offer the sample script to complete the procedure. If you want any additional information regarding the network traffic analysis we will provide.