How to Implement Network Packet Switching in ns3

To implement network packet switching in ns3, involves creating a network topology. In that topology on the basis of the destination addresses the data packets has to be routed via intermediate nodes this type of typical scenarios particularly used in IP network simulation. This is a typical scenario for simulating IP networks. The following steps will guide on setting up a basic simulation of packet switching in ns3.

Step-by-step guide to implement packet switching in ns3:

Step 1: Setup ns3 Environment

Make sure that ns3 installed and properly configured.

git clone https://gitlab.com/nsnam/ns-3-dev.git

cd ns-3-dev

./waf configure

./waf build

Step 2: Create the Network Packet Switching Simulation Script

We will create a script that sets up a simple network topology with multiple nodes, configures point-to-point links, and simulates data transmission between the nodes using packet switching.

#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”

using namespace ns3;

 

NS_LOG_COMPONENT_DEFINE(“PacketSwitchingExample”);

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

{

CommandLine cmd;

cmd.Parse(argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create(6); // Six nodes for a simple network topology

// Set up point-to-point links

PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, StringValue(“5Mbps”));

p2p.SetChannelAttribute(“Delay”, StringValue(“2ms”));

// Install point-to-point devices and channels between nodes

NetDeviceContainer devices;

devices = p2p.Install(nodes.Get(0), nodes.Get(1));

devices.Add(p2p.Install(nodes.Get(1), nodes.Get(2)));

devices.Add(p2p.Install(nodes.Get(2), nodes.Get(3)));

devices.Add(p2p.Install(nodes.Get(3), nodes.Get(4)));

devices.Add(p2p.Install(nodes.Get(4), nodes.Get(5)));

// Install the 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 routing

Ipv4GlobalRoutingHelper::PopulateRoutingTables();

// Install applications to generate traffic

uint16_t port = 9;

// Node 0 will send data to Node 5

OnOffHelperonoff(“ns3::UdpSocketFactory”, Address(InetSocketAddress(interfaces.GetAddress(4), port)));

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

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

apps.Start(Seconds(1.0));

apps.Stop(Seconds(10.0));

// Install packet sink on Node 5 to receive packets

PacketSinkHelpersink(“ns3::UdpSocketFactory”, Address(InetSocketAddress(Ipv4Address::GetAny(), port)));

apps = sink.Install(nodes.Get(5));

apps.Start(Seconds(0.0));

apps.Stop(Seconds(10.0));

// Enable FlowMonitor to measure performance metrics

FlowMonitorHelper flowmon;

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

// Run the simulation

Simulator::Stop(Seconds(10.0));

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);

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

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

NS_LOG_UNCOND(”  Lost Packets: ” << i->second.lostPackets);

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

}

// Clean up

Simulator::Destroy();

return 0;

}

Step 3: Compile and Run the Simulation

1. Compile the Simulation:

./waf configure –enable-examples

./waf build

Run the Simulation:

./waf –run scratch/packet-switching-example

Step 4: Analyze Results

The simulation script sets up a simple network topology with packet switching, where data is transmitted from Node 0 to Node 5 through intermediate nodes. Flow Monitor is used to collect and print out statistics about the traffic flows, such as packet loss, throughput, and delay.

Additional Considerations

To extend the functionality of packet switching network simulation, our developers team consider the following:

1. Complex Topologies

By producing more complex network topologies to simulate real-world networks, including mesh, star, and ring topologies.

2. Dynamic Routing Protocols

We must integrate dynamic routing protocols such as OSPF, BGP, or AODV to manage the routing of packets in the network.

3. Traffic Patterns

Here we will simulate different types of traffic patterns, such as IoT data, VoIP, video streaming, and bulk data transfer, to study their impact on the network.

4. Quality of Service (QoS)

In this stage we must Implement QoS mechanisms to prioritize certain types of traffic and ensure that critical data flows receive the necessary bandwidth and low latency.

5. Performance Metrics

We must Collect and analyze additional metrics such as jitter, packet delay variation, and error rates to evaluate the network performance more widely.

Over all, we had analyzed the implementation process of network packet switching in ns3 by routing the data packets that are transmitted through a intermediate nodes on the basis of destination address for simulating IP networks.

For optimal results in comparative analysis and the implementation of Network Packet Switching using ns3tool, we encourage you to visit ns3simulation.com. Our expertise ensures that you receive the best simulation outcomes for IP networks pertinent to your projects.