How to Implement Wired LANs in OMNeT++

To implement the Wired Local Area Networks (LANs) in OMNeT++ has needs to design and emulate the network that custom the wired communication protocols like Ethernet to connect devices. The OMNeT++ with the INET framework delivers the detailed support for emulating wired LANs. The given below are the procedures on how to implement the wired LAN in OMNeT++ using the INET framework:

Step-by-Step Implementation:

Install OMNeT++ and INET Framework

Make sure we have OMNeT++ and the INET Framework installed.

Create a New OMNeT++ Project

Open OMNeT++ IDE: Start the OMNeT++ IDE.
Create a New Project: Go to File -> New -> OMNeT++ Project. Name the project as WiredLANSimulation.

Define the Network Topology

Generate a new NED file to describe network topology that contains hosts and switches connected through Ethernet.

Example: Wired LAN Network Topology (WiredLANNetwork.ned)

package wiredlan;

import inet.node.inet.StandardHost;

import inet.node.ethernet.EtherSwitch;

network WiredLANNetwork

{

parameters:

@display(“bgb=800,400”);

submodules:

host1: StandardHost {

@display(“p=100,200”);

}

host2: StandardHost {

@display(“p=300,200”);

}

host3: StandardHost {

@display(“p=500,200”);

}

switch: EtherSwitch {

@display(“p=300,100”);

}

connections allowunconnected:

host1.ethg++ <–> Eth100M <–> switch.ethg++;

host2.ethg++ <–> Eth100M <–> switch.ethg++;

host3.ethg++ <–> Eth100M <–> switch.ethg++;

}

Configure the Simulation

Create an OMNeT++ initialization file to configure the parameters of the simulation.

Example: Configuration File (omnetpp.ini)

network = wiredlan.WiredLANNetwork

sim-time-limit = 100s

# Visualization

*.visualizer.canvasVisualizer.displayBackground = true

*.visualizer.canvasVisualizer.displayGrid = true

# Host Configuration

*.host*.numApps = 1

*.host*.app[0].typename = “UdpBasicApp”

*.host*.app[0].destAddresses = “host3”

*.host*.app[0].destPort = 5000

*.host*.app[0].messageLength = 1024B

*.host*.app[0].sendInterval = 1s

# Switch Configuration

*.switch.numPorts = 3

# IP Address Configuration

*.host1.ipv4.config = xmldoc(“host1.xml”)

*.host2.ipv4.config = xmldoc(“host2.xml”)

*.host3.ipv4.config = xmldoc(“host3.xml”)

Create IP Address Configuration Files

Create XML files to describe the IP address configuration for each node.

Example: IP Configuration File for host1 (host1.xml)

</interface>

</config>

Example: IP Configuration File for host2 (host2.xml)

</interface>

</config>

Example: IP Configuration File for host3 (host3.xml)

</interface>

</config>

Implement Application Logic

To mimic the characteristics of applications running on the hosts then use pre-defined application modules in the INET framework or implements your own.

Example: UDP Basic Application (Pseudo-Code)

#include <omnetpp.h>

#include <inet/applications/udpapp/UdpBasicApp.h>

using namespace omnetpp;

using namespace inet;

class CustomUdpApp : public UdpBasicApp

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

};

Define_Module(CustomUdpApp);

void CustomUdpApp::initialize(int stage) {

UdpBasicApp::initialize(stage);

if (stage == INITSTAGE_APPLICATION_LAYER) {

// Custom initialization code

}

void CustomUdpApp::handleMessageWhenUp(cMessage *msg) {

UdpBasicApp::handleMessageWhenUp(msg);

// Custom message handling code

}

Run the Simulation

Build the Project: Right-click on your project and choose Build Project.
Run the Simulation: Click on the green play button in the OMNeT++ IDE to start the simulation.

In the end, we discussed the elaborated guide to implement the Wired Local Area Networks (LANs) in OMNeT++ that emulate the network then custom Ethernet to connect devices. If you have any doubts regarding the wired local area network we will provide it.

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