How to Implement dsdv protocol in OMNeT++

To implement the DSDV (Destination-Sequenced Distance Vector) protocol in OMNeT++ encompasses put on the actions of DSDV, with the give-and-take of routing updates and upkeep of the routing table. Now given below is a step-by-step guide to implementing the DSDV protocol in OMNeT++ by using the INET framework:

Step-by-Step Guide

Install OMNeT++ and INET Framework

Make a certain OMNeT++ and the INET Framework is install.

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 like DSDVSimulation.

Define the Network Topology

To build a new NED file to define the network topology, with hosts and routers that run the DSDV protocol.

Example:

DSDV Network Topology (DSDVNetwork.ned)

package dsdvnetwork;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

network DSDVNetwork

{

parameters:

@display(“bgb=800,400”);

submodules:

host1: StandardHost {

@display(“p=100,200”);

}

host2: StandardHost {

@display(“p=300,200”);

}

router1: Router {

@display(“p=200,100”);

}

router2: Router {

@display(“p=200,300”);

}

connections allowunconnected:

host1.ethg++ <–> Eth10M <–> router1.ethg++;

host2.ethg++ <–> Eth10M <–> router2.ethg++;

router1.ethg++ <–> Eth10M <–> router2.ethg++;

}

Configure the Simulation

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

Example:

Configuration File (omnetpp.ini)

[General]

network = dsdvnetwork.DSDVNetwork

sim-time-limit = 200s

# Visualization

*.visualizer.canvasVisualizer.displayBackground = true

*.visualizer.canvasVisualizer.displayGrid = true

# Host Configuration

*.host*.numApps = 1

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

*.host*.app[0].destAddresses = “host2”

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

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

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

# Router Configuration

*.router*.numApps = 1

*.router*.app[0].typename = “DSDVApp”

Create IP Address Configuration Files

To build XML files to express the IP address configuration for every 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 router1 (router1.xml)

</interface>

</interface>

</config>

Example:

IP Configuration File for router2 (router2.xml)

</interface>

</interface>

</config>

Implement DSDV Logic

To put on the DSDV protocol, implement an application that switches the interchange of DSDV messages and apprises the routing table.

Example:

DSDV Router Application (Pseudo-Code)

#include <omnetpp.h>

#include <inet/applications/base/ApplicationBase.h>

#include <inet/networklayer/contract/ipv4/Ipv4Address.h>

#include <inet/networklayer/routing/Ipv4RoutingTable.h>

#include <inet/common/ModuleAccess.h>

#include <map>

using namespace omnetpp;

using namespace inet;

class DSDVApp : public ApplicationBase

{

protected:

struct RouteEntry {

Ipv4Address nextHop;

int metric;

uint32_t sequenceNumber;

};

std::map<Ipv4Address, RouteEntry> dsdvRoutingTable;

simtime_t updateInterval;

cMessage *updateTimer;

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void handlePacket(cMessage *msg);

void sendRoutingUpdates();

void processRoutingUpdate(cMessage *msg);

void addOrUpdateRoute(const Ipv4Address &dest, const Ipv4Address &nextHop, int metric, uint32_t sequenceNumber);

};

Define_Module(DSDVApp);

void DSDVApp::initialize(int stage) {

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_APPLICATION_LAYER) {

updateInterval = par(“updateInterval”);

updateTimer = new cMessage(“updateTimer”);

scheduleAt(simTime() + updateInterval, updateTimer);

}

void DSDVApp::handleMessageWhenUp(cMessage *msg) {

if (msg == updateTimer) {

sendRoutingUpdates();

scheduleAt(simTime() + updateInterval, updateTimer);

} else if (msg->isPacket()) {

handlePacket(msg);

} else {

ApplicationBase::handleMessageWhenUp(msg);

}

void DSDVApp::handlePacket(cMessage *msg) {

// Process incoming routing updates

processRoutingUpdate(msg);

}

void DSDVApp::sendRoutingUpdates() {

// Create and send routing update packets to neighbors

for (auto &entry : dsdvRoutingTable) {

cMessage *updateMsg = new cMessage(“RoutingUpdate”);

updateMsg->addPar(“destAddr”) = entry.first.str().c_str();

updateMsg->addPar(“nextHop”) = entry.second.nextHop.str().c_str();

updateMsg->addPar(“metric”) = entry.second.metric;

updateMsg->addPar(“sequenceNumber”) = entry.second.sequenceNumber;

send(updateMsg, “ifOut”);

}

void DSDVApp::processRoutingUpdate(cMessage *msg) {

// Process incoming routing update messages

Ipv4Address destAddr = Ipv4Address(msg->par(“destAddr”).stringValue());

Ipv4Address nextHop = Ipv4Address(msg->par(“nextHop”).stringValue());

int metric = msg->par(“metric”);

uint32_t sequenceNumber = msg->par(“sequenceNumber”);

addOrUpdateRoute(destAddr, nextHop, metric, sequenceNumber);

delete msg;

}

void DSDVApp::addOrUpdateRoute(const Ipv4Address &dest, const Ipv4Address &nextHop, int metric, uint32_t sequenceNumber) {

auto it = dsdvRoutingTable.find(dest);

if (it == dsdvRoutingTable.end() || it->second.sequenceNumber < sequenceNumber || (it->second.sequenceNumber == sequenceNumber && it->second.metric > metric)) {

dsdvRoutingTable[dest] = {nextHop, metric, sequenceNumber};

}

Configure and Initialize the Simulation

Make sure the routers are configured to use the custom DSDV protocol.

Example:

Configuration File (omnetpp.ini)

[General]

network = dsdvnetwork.DSDVNetwork

sim-time-limit = 200s

# Visualization

*.visualizer.canvasVisualizer.displayBackground = true

*.visualizer.canvasVisualizer.displayGrid = true

# Host Configuration

*.host*.numApps = 1

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

*.host*.app[0].destAddresses = “host2”

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

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

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

# Router Configuration

*.router*.numApps = 1

*.router*.app[0].typename = “DSDVApp”

*.router*.app[0].updateInterval = 15s

Run the Simulation

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

Over the scripts, we can know about how the protocol DSDV act by using the INET framework, express topology, to create IP address in the DSDV protocol. We have idea to provide more details about to implement the DSDV protocol in OMNeT++.

Seek help with implementing the DSDV protocol in OMNeT++ programming from ns3simulation.com. We provide simulation results tailored for your projects, ensuring you achieve the best outcomes with our support.