How to Implement distributed routing in OMNeT++

To implement the distributed routing in OMNeT++ consist of making a network where the separate node independently creates routing decisions based on facts shared with neighbouring nodes. This protocols are important in networks where integrated control is not possible, like in mobile ad hoc networks (MANETs) or large-scale networks.

The following step-by-step process is to implementing a generic distributed routing protocol in OMNeT++ by using the INET framework.

Step-by-Step Implementations:

Step 1: Set Up OMNeT++ and INET Framework

1. Install OMNeT++:
   • Make sure OMNeT++ is installed on the system. To download it from the OMNeT++
2. Install the INET Framework:
   • Download and install the INET Framework, which affords many networking protocols and models. From the INET GitHub repository to download INET.

Step 2: Create a New OMNeT++ Project

1. Create the Project:
   • Exposed OMNeT++ and build a new OMNeT++ project via File > New > OMNeT++ Project.
   • Name the project like DistributedRoutingSimulation and fixed the project directory.
2. Set Up Project Dependencies:
   • Make a certain project references the INET Framework by right-clicking on the project in the Project Explorer, navigating to Properties > Project References, and read-through the INET project.

Step 3: Define the Network Topology

1. Create a NED File:
   • Describe the network topology using the NED language. This topology will comprise routers or nodes that will usage the distributed routing protocol.

Example:

network DistributedRoutingNetwork

{

submodules:

router1: Router;

router2: Router;

router3: Router;

router4: Router;

host1: StandardHost;

host2: StandardHost;

connections allowunconnected:

router1.ethg++ <–> Eth10Mbps <–> router2.ethg++;

router2.ethg++ <–> Eth10Mbps <–> router3.ethg++;

router3.ethg++ <–> Eth10Mbps <–> router4.ethg++;

router1.ethg++ <–> Eth10Mbps <–> host1.ethg++;

router4.ethg++ <–> Eth10Mbps <–> host2.ethg++;

}

1. Configure Network Parameters:
   • Set up a required link parameters like delay, bandwidth, and packet loss to simulate a genuine network environment.

Step 4: Implement the Distributed Routing Protocol

1. Define the Routing Module:
   • To build a fresh module in NED for the distributed routing protocol. This module will handle routing decisions based on the information usual from neighbouring nodes.

Example (in NED):

simple DistributedRouting

{

parameters:

@display(“i=block/network2”);

gates:

inout lowerLayerIn[];

inout lowerLayerOut[];

}

1. Implement Routing Logic in C++:
   • To implement the routing logic in C++ that permits each node to create independent routing decisions based on the data substituted with its neighbours.

Example (C++ implementation):

#include <map>

#include “inet/common/INETDefs.h”

#include “inet/networklayer/contract/IRoutingTable.h”

#include “inet/networklayer/ipv4/IPv4RoutingTable.h”

class DistributedRouting : public cSimpleModule

{

private:

struct RoutingEntry {

double cost;

std::string nextHop;

};

std::map<std::string, RoutingEntry> routingTable;  // Destination -> (Cost, Next Hop)

IRoutingTable *inetRoutingTable;

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

void exchangeRoutingInformation();

void updateRoutingTable(const std::string& destination, double cost, const std::string& nextHop);

};

Define_Module(DistributedRouting);

void DistributedRouting::initialize() {

inetRoutingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);

// Initialize routing table

exchangeRoutingInformation();

}

void DistributedRouting::handleMessage(cMessage *msg) {

// Handle incoming packets and route them based on the routing table

}

void DistributedRouting::exchangeRoutingInformation() {

// Exchange routing information with neighbors

// This could involve sending and receiving route update messages

for (auto &entry : routingTable) {

// Send routing information to neighbors

// Update local routing table based on received information

}

}

void DistributedRouting::updateRoutingTable(const std::string& destination, double cost, const std::string& nextHop) {

if (routingTable.find(destination) == routingTable.end() || routingTable[destination].cost > cost) {

routingTable[destination] = {cost, nextHop};

EV << “Updated route to ” << destination << ” via ” << nextHop << ” with cost ” << cost << endl;

}

}

1. • Routing Table: The module preserves a routing table where each entry contains next hop to use and the cost to reach a destination.
   • Information Exchange: Nodes interchange routing information with their neighbours, which they use to inform their routing tables.
   • Routing Table Updates: The routing table is efficient based on the information established from neighbours to keep the best path to each end.

Step 5: Set Up the Simulation

1. Configure the Simulation in omnetpp.ini:
   • Set up the simulation parameters, like simulation time, network settings, and traffic patterns.

Example:

[General]

network = DistributedRoutingNetwork

sim-time-limit = 100s

**.scalar-recording = true

**.vector-recording = true

# Application traffic configuration (if needed)

*.host1.numApps = 1

*.host1.app[0].typename = “UdpBasicApp”

*.host1.app[0].destAddress = “host2”

*.host1.app[0].destPort = 5000

*.host1.app[0].messageLength = 1024B

*.host1.app[0].sendInterval = uniform(1s, 2s)

1. Traffic Configuration:
   • Set up application-level traffic between nodes to generate network activity, triggering the distributed routing protocol.

Step 6: Run the Simulation

1. Compile the Project:
   • Make a certain everything is properly implemented and compiled.
2. Run Simulations:
   • Implement the simulations using OMNeT++’s IDE or command line. Note that the distributed routing protocol was performed under many situations.

Step 7: Analyze the Results

1. Monitor Protocol Behavior:
   • Appraise how this protocol handles routing, expressly under different network scenarios.
2. Evaluate Performance:
   • Analyse key concert metrics like packet delivery ratio, end-to-end delay, and routing upstairs.
   • Scalars and Vectors: By using the OMNeT++ tools to evidence and consider scalar and vector data, like the time take to deliver packets, the number of packets sent, received, and dropped.
3. Check for Issues:
   • Look for issues like packet loss, routing loops, or excessive delay that may indicate problems with the routing logic.

Step 8: Refine and Optimize the Protocol

1. Address Any Issues:
   • Perfect the routing logic based on the recreation results to enhance performance and address any problems.
2. Optimize for Performance:
   • Fine-tune constraints such as packet forwarding rules, routing table update intervals, or link cost calculations to advance network proficiency.
3. Re-Test:
   • Run the simulation again with the elevated protocol to confirm enhancements.

In the entire details, we are developed the Distributed Routing in OMNeT++ by using the INET framework. Now, we will provide supplementary materials depends on your desires. Implementation of distributed routing in OMNeT++tool are done by us so drop us your project details we will guide you with best simulation results.