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How to Calculate Network Logging in ns3

To calculate network logging in ns3, we need to set up mechanisms to log various network events and activities, that includes packet transmissions, receptions, drops, and other relevant metrics. This logging helps in understanding the network behavior, troubleshooting issues, and analyzing performance. Here is a guide on implementing and calculating network logging in ns3.

Steps for calculating network logging

  1. Set up the simulation :
  • Make sure that ns3 is installed in the computer. If not, install it and include necessary modules.
  1. Define Network Topology:
  • Define the network topology by incorporating nodes representing clients, servers, and routers etc.
  1. Implement Logging Mechanisms:
  • To log various network events, use ns3 trace sources or callbacks.
  1. Configure Applications:
  • On the nodes, setup applications to generate and receive traffic.
  1. Monitor and Log Events:
  • To monitor and log events such as packet transmissions, receptions, and drops, use trace sources or callbacks.
  1. Analyze Logged Data:
  • To understand network behavior and performance, collect and analyze the logged data.

Example code

Here is an example to set up a basic simulation to log various network events in ns3. This example logs packet transmissions, receptions, and drops.

#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”

#include “ns3/packet.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkLoggingExample”);

void TxCallback (Ptr<const Packet> packet, Ptr<Ipv4> ipv4, uint32_t interface)

{

NS_LOG_UNCOND (“Packet transmitted at ” << Simulator::Now ().GetSeconds () << ” seconds, size: ” << packet->GetSize ());

}

void RxCallback (Ptr<const Packet> packet, Ptr<Ipv4> ipv4, uint32_t interface)

{

NS_LOG_UNCOND (“Packet received at ” << Simulator::Now ().GetSeconds () << ” seconds, size: ” << packet->GetSize ());

}

void DropCallback (Ptr<const Packet> packet, Ptr<Ipv4> ipv4, uint32_t interface)

{

NS_LOG_UNCOND (“Packet dropped at ” << Simulator::Now ().GetSeconds () << ” seconds, size: ” << packet->GetSize ());

}

void CalculateLoggingPerformance (Ptr<FlowMonitor> flowMonitor, FlowMonitorHelper &flowHelper)

{

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

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

double totalThroughput = 0.0;

double totalLatency = 0.0;

uint32_t totalPackets = 0;

uint32_t lostPackets = 0;

for (auto it = stats.begin (); it != stats.end (); ++it)

{

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

double throughput = it->second.rxBytes * 8.0 / (it->second.timeLastRxPacket.GetSeconds () – it->second.timeFirstTxPacket.GetSeconds ()) / 1024; // kbps

double latency = it->second.delaySum.GetSeconds () / it->second.rxPackets * 1000; // ms

uint32_t packets = it->second.rxPackets + it->second.lostPackets;

totalThroughput += throughput;

totalLatency += latency;

totalPackets += packets;

lostPackets += it->second.lostPackets;

}

double averageLatency = totalPackets > 0 ? totalLatency / stats.size () : 0;

double packetLoss = totalPackets > 0 ? (static_cast<double> (lostPackets) / totalPackets) * 100 : 0;

NS_LOG_UNCOND (“Total Throughput: ” << totalThroughput << ” kbps”);

NS_LOG_UNCOND (“Average Latency: ” << averageLatency << ” ms”);

NS_LOG_UNCOND (“Packet Loss: ” << packetLoss << ” %”);

}

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

Time::SetResolution (Time::NS);

// Create nodes

NodeContainer nodes;

nodes.Create (4); // Two clients and two servers

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices01 = pointToPoint.Install (NodeContainer (nodes.Get (0), nodes.Get (1)));

NetDeviceContainer devices12 = pointToPoint.Install (NodeContainer (nodes.Get (1), nodes.Get (2)));

NetDeviceContainer devices23 = pointToPoint.Install (NodeContainer (nodes.Get (2), nodes.Get (3)));

// 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 interfaces01 = address.Assign (devices01);

address.SetBase (“10.1.2.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces12 = address.Assign (devices12);

address.SetBase (“10.1.3.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces23 = address.Assign (devices23);

// Enable routing

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

// Create UDP server on node 2 and node 3

UdpServerHelper server (9);

ApplicationContainer serverApp1 = server.Install (nodes.Get (2));

ApplicationContainer serverApp2 = server.Install (nodes.Get (3));

serverApp1.Start (Seconds (1.0));

serverApp1.Stop (Seconds (10.0));

serverApp2.Start (Seconds (1.0));

serverApp2.Stop (Seconds (10.0));

// Create UDP client on node 0 and node 1

UdpClientHelper client1 (interfaces12.GetAddress (1), 9);

client1.SetAttribute (“MaxPackets”, UintegerValue (320));

client1.SetAttribute (“Interval”, TimeValue (MilliSeconds (10)));

client1.SetAttribute (“PacketSize”, UintegerValue (1024));

UdpClientHelper client2 (interfaces23.GetAddress (1), 9);

client2.SetAttribute (“MaxPackets”, UintegerValue (320));

client2.SetAttribute (“Interval”, TimeValue (MilliSeconds (10)));

client2.SetAttribute (“PacketSize”, UintegerValue (1024));

ApplicationContainer clientApp1 = client1.Install (nodes.Get (0));

ApplicationContainer clientApp2 = client2.Install (nodes.Get (1));

clientApp1.Start (Seconds (2.0));

clientApp1.Stop (Seconds (10.0));

clientApp2.Start (Seconds (2.0));

clientApp2.Stop (Seconds (10.0));

// Trace packet transmission, reception, and drops

Config::ConnectWithoutContext (“/NodeList/*/ApplicationList/*/$ns3::UdpClient/Tx”, MakeCallback (&TxCallback));

Config::ConnectWithoutContext (“/NodeList/*/ApplicationList/*/$ns3::UdpServer/Rx”, MakeCallback (&RxCallback));

Config::ConnectWithoutContext (“/NodeList/*/DeviceList/*/Drop”, MakeCallback (&DropCallback));

// Install flow monitor to capture performance metrics

FlowMonitorHelper flowHelper;

Ptr<FlowMonitor> flowMonitor = flowHelper.InstallAll ();

Simulator::Stop (Seconds (11.0));

Simulator::Run ();

CalculateLoggingPerformance (flowMonitor, flowHelper);

Simulator::Destroy ();

return 0;

}

Explanation

  1. Setup:

Created four nodes: two clients and two server. and those nodes are connected by point-to-point links.

  1. Internet Stack and Routing:

On all nodes, the internet stack is installed and global routing is enabled.

  1. Applications:

On  nodes (node 2 and 3), a UDP server is installed, and a UDP client is installed on node 0 and 1 to generate traffic.

  1. Logging mechanisms:

To trace packet transmissions, receptions, and drops, the TxCallback, RxCallback, and DropCallback functions are connected. These functions log relevant information using NS_LOG_UNCOND.

  1. Performance Calculation:

To gather and log performance metrics like throughput, latency, and packet loss, CalculateLoggingPerformance function uses FlowMonitor.

Running the Simulation

Compile and run the simulation using the following commands.

./waf configure

./waf build

./waf –run your-script-name

Replace your-script-name with the actual name of your script file.

Overall, we had calculated the network logging in ns3 by setting up mechanisms to log various network events and activities, such as packet transmissions, receptions, drops, and other relevant metrics. Also, we provide more related information on Network Logging.

We analyze networking performance for your projects, so please provide us with all your parameter details. We will help you achieve the best results when calculating network logging in ns3 simulation. Trust our experts for network behavior, troubleshooting, and performance analysis.