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# How to Calculate Network Percentage of Packet drop in ns3

To calculate percentage of packet drop in ns3, we need to monitor the number of packets sent and received during the simulation and calculate the drop rate. Here are the steps to achieve this.

Steps for calculating Packet Drop Percentage

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:
• create the network topology by incorporating nodes and links.
1. Configure Applications:
• On the nodes, setup applications to generate and receive traffic.
1. Monitor Packet Transmission and Reception:
• To monitor the number of packets sent and received, use trace sources or callbacks.
1. Calculate Packet Drop:
• Calculate the percentage of packet drops using the formula: Packet Drop Percentage=(Packets Sent−Packets ReceivedPackets Sent)×100\text{Packet Drop Percentage} = \left( \frac{\text{Packets Sent} – \text{Packets Received}}{\text{Packets Sent}} \right) \times 100Packet Drop Percentage=(Packets SentPackets Sent−Packets Received)×100.

Example code

Here is an example to set up a basic simulation to calculate the packet drop percentage in ns3. This example uses a simple point-to-point network and UDP applications.

#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 (“PacketDropExample”);

uint32_t packetsSent = 0;

void TxCallback (Ptr<OutputStreamWrapper> stream, Ptr<const Packet> packet)

{

packetsSent++;

*stream->GetStream () << Simulator::Now ().GetSeconds () << ” TX ” << packet->GetSize () << std::endl;

}

{

*stream->GetStream () << Simulator::Now ().GetSeconds () << ” RX ” << packet->GetSize () << std::endl;

}

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

Time::SetResolution (Time::NS);

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);

// Create a UDP server on node 1

UdpServerHelper server (9);

ApplicationContainer serverApp = server.Install (nodes.Get (1));

serverApp.Start (Seconds (1.0));

serverApp.Stop (Seconds (10.0));

// Create a UDP client on node 0

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

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

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

ApplicationContainer clientApp = client.Install (nodes.Get (0));

clientApp.Start (Seconds (2.0));

clientApp.Stop (Seconds (10.0));

AsciiTraceHelper ascii;

Ptr<OutputStreamWrapper> streamTx = ascii.CreateFileStream (“udp-packet-sent.tr”);

Config::ConnectWithoutContext (“/NodeList/0/ApplicationList/*/$ns3::UdpClient/Tx”, MakeBoundCallback (&TxCallback, streamTx)); Config::ConnectWithoutContext (“/NodeList/1/ApplicationList/*/$ns3::UdpServer/Rx”, MakeBoundCallback (&RxCallback, streamRx));

Simulator::Run ();

Simulator::Destroy ();

double packetDropPercentage = (packetsSent – packetsReceived) * 100.0 / packetsSent;

std::cout << “Packets Sent: ” << packetsSent << std::endl;

std::cout << “Packet Drop Percentage: ” << packetDropPercentage << “%” << std::endl;

return 0;

}

Explanation

1. Setup:

Created two nodes and those nodes are connected by point-to-point links.

1. Applications:

On node 1, a UDP server is installed, and a UDP client is installed on node 0 to generate traffic.

1. Callbacks:

The TxCallback function is used to increment the packetsSent counter each time a packet is transmitted. The RxCallback function increments the packetsReceived counter each time a packet is received.

1. Tracing:

trace the packet transmissions and receptions to files, the AsciiTraceHelper is used.

1. Simulation:

After which the packet drop percentage is calculated and printed, the simulation is run for a specified time.

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.

On the whole we had a performance analysis on calculating network percentage of packet drop in ns3 by monitoring the number of packets sent and received during the simulation and calculating the drop rate. Also, we provide more explanation on Network Percentage of Packet Drop.

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