How to Implement Network Performance Analysis in ns3

To applying a network performance analysis in ns3 using various tools to collect and evaluate performance metrics like throughput, delay, packet loss, and jitter and encompasses set up a network simulation and the following information will pace you during the process of setting up a basic network, generating traffic and by gathering performance data using ns3’s Flow Monitor and extra helper classes.

Step by Step Implementation:

Step 1: Setup ns3 Environment

Make certain ns3 is connected and set up on the system.

Step 2: Include Necessary Modules

In the script we contain the essential ns3 modules:

#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 (“NetworkPerformanceAnalysis”);

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create (4);

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices;

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

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

devices.Add (pointToPoint.Install (NodeContainer (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);

// Set up applications

uint16_t port = 9;  // Discard port (RFC 863)

// Server application on node 3

Address serverAddress (InetSocketAddress (Ipv4Address::GetAny (), port));

PacketSinkHelper packetSinkHelper (“ns3::UdpSocketFactory”, serverAddress);

ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (3));

sinkApps.Start (Seconds (1.0));

sinkApps.Stop (Seconds (20.0));

// Client application on node 0

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

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

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

apps.Start (Seconds (2.0));

apps.Stop (Seconds (20.0));

// Flow monitor

FlowMonitorHelper flowmon;

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

Simulator::Stop (Seconds (20.0));

Simulator::Run ();

// Print per-flow 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);

std::cout << “Flow ” << i->first << ” (” << t.sourceAddress << ” -> ” << t.destinationAddress << “)\n”;

std::cout << ”  Tx Bytes: ” << i->second.txBytes << “\n”;

std::cout << ”  Rx Bytes: ” << i->second.rxBytes << “\n”;

std::cout << ”  Tx Packets: ” << i->second.txPackets << “\n”;

std::cout << ”  Rx Packets: ” << i->second.rxPackets << “\n”;

std::cout << ”  Throughput: ” << i->second.rxBytes * 8.0 / (i->second.timeLastRxPacket.GetSeconds() – i->second.timeFirstTxPacket.GetSeconds()) / 1024 / 1024 << ” Mbps\n”;

std::cout << ”  Delay: ” << i->second.delaySum.GetSeconds() / i->second.rxPackets << ” s\n”;

}

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

Simulator::Destroy ();

return 0;

}

Step 4: Run the Simulation

Now we accumulate and run the simulation script:

./waf configure

./waf build

./waf –run NetworkPerformanceAnalysis

Explanation

• Node Creation: In the network we create nodes representing different devices.
• Point-to-Point Links: To organized point-to-point links among nodes with specified data rates and delays.
• Internet Stack: Set up the Internet stack on all nodes.
• IP Configuration: In the interfaces to assign IP addresses.
• Applications: Apply OnOffApplication and PacketSink to simulate traffic among the nodes.
• Flow Monitor: To collect traffic data, that includes metrics such as transmitted and received bytes, packets, throughput, and delay by using the flow monitor.

Advanced Network Performance Analysis Techniques

1. Additional Metrics:

Gather and examine supplementary metrics like jitter, hop count and packet loss rate.

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

{

std::cout << ”  Jitter: ” << i->second.jitterSum.GetSeconds() / i->second.rxPackets << ” s\n”;

std::cout << ”  Packet Loss Rate: ” << (i->second.txPackets – i->second.rxPackets) * 100.0 / i->second.txPackets << ” %\n”;

}

1. Multiple Traffic Flows:

To pretend and evaluate multiple traffic flows with various types like different data rates, protocols.

// Additional client application on another node

OnOffHelper onoff2 (“ns3::UdpSocketFactory”, Address (InetSocketAddress (interfaces.GetAddress (3), port)));

onoff2.SetConstantRate (DataRate (“500Kbps”));

ApplicationContainer apps2 = onoff2.Install (nodes.Get (1));

apps2.Start (Seconds (3.0));

apps2.Stop (Seconds (20.0));

1. Dynamic Network Conditions:

To create energetic network conditions like node mobility, or varying data rates link failures,

// Change data rate of a link after 10 seconds

Simulator::Schedule (Seconds (10.0), &Config::Set, “/NodeList/1/DeviceList/0/$ns3::PointToPointNetDevice/DataRate”, StringValue (“5Mbps”));

1. Visualization Tools:

To envision the network topology and traffic flows by using  network visualization tools such as NetAnim.

AnimationInterface anim (“network-performance-analysis.xml”);

anim.SetConstantPosition (nodes.Get (0), 1.0, 2.0);

anim.SetConstantPosition (nodes.Get (1), 2.0, 2.0);

anim.SetConstantPosition (nodes.Get (2), 3.0, 2.0);

anim.SetConstantPosition (nodes.Get (3), 4.0, 2.0);

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