How to Implement epidemic protocol in OMNeT++
To implement an epidemic protocol in OMNeT++ contains to building a module that models the conduct of the epidemic routing protocol, which is usually used in delay-tolerant networks (DTNs) or mobile ad-hoc networks (MANETs). The epidemic routing protocol count on on the idea of scattering information such as a virus, confirming tall message sending probabilities even in extremely dynamic or sparse networks.
Step-by-Step Implementations:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++: From the OMNeT++ to download and install the new version of OMNeT++.
- Install INET Framework: To download and install the INET framework from the INET source.
Step 2: Define the Epidemic Protocol
To make the required .ned file for the epidemic protocol module.
Define the Module in .ned File
simple Epidemic
{
parameters:
@display(“i=block/router”);
double beaconInterval @unit(s) = default(1s); // Interval for sending beacons
double messageTTL @unit(s) = default(300s); // Time-to-live for messages
gates:
input fromNetworkLayer;
output toNetworkLayer;
input fromMacLayer;
output toMacLayer;
}
Step 3: Implement the Epidemic Protocol in C++
To build the corresponding .cc and .h files.
Epidemic.h
#ifndef __EPIDEMIC_H_
#define __EPIDEMIC_H_
#include <omnetpp.h>
#include <map>
#include <vector>
#include “inet/common/INETDefs.h”
#include “inet/networklayer/contract/IInterfaceTable.h”
#include “inet/networklayer/common/L3Address.h”
#include “inet/networklayer/common/L3AddressResolver.h”
using namespace omnetpp;
using namespace inet;
class Epidemic : public cSimpleModule
{
private:
double beaconInterval;
double messageTTL;
IInterfaceTable *interfaceTable;
std::map<L3Address, std::vector<cPacket*>> messageTable; // Stores messages by destination
std::map<int, simtime_t> messageTimestamps; // Stores timestamps for message TTL
cMessage *beaconMsg;
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void sendBeacon();
void processBeacon(cMessage *msg);
void handleUpperLayerPacket(cPacket *packet);
void handleLowerLayerPacket(cPacket *packet);
void forwardMessage(cPacket *packet);
public:
Epidemic();
virtual ~Epidemic();
};
#endif
Epidemic.cc
#include “Epidemic.h”
Define_Module(Epidemic);
Epidemic::Epidemic()
{
beaconMsg = nullptr;
}
Epidemic::~Epidemic()
{
cancelAndDelete(beaconMsg);
}
void Epidemic::initialize()
{
beaconInterval = par(“beaconInterval”);
messageTTL = par(“messageTTL”);
interfaceTable = getModuleFromPar<IInterfaceTable>(par(“interfaceTableModule”), this);
beaconMsg = new cMessage(“sendBeacon”);
scheduleAt(simTime() + beaconInterval, beaconMsg);
}
void Epidemic::handleMessage(cMessage *msg)
{
if (msg == beaconMsg)
{
sendBeacon();
scheduleAt(simTime() + beaconInterval, beaconMsg);
}
else if (msg->arrivedOn(“fromNetworkLayer”))
{
handleUpperLayerPacket(check_and_cast<cPacket *>(msg));
}
else if (msg->arrivedOn(“fromMacLayer”))
{
handleLowerLayerPacket(check_and_cast<cPacket *>(msg));
}
else if (strcmp(msg->getName(), “Beacon”) == 0)
{
processBeacon(msg);
}
else
{
delete msg;
}
}
void Epidemic::sendBeacon()
{
cMessage *beacon = new cMessage(“Beacon”);
send(beacon, “toMacLayer”);
}
void Epidemic::processBeacon(cMessage *msg)
{
// Send stored messages to the node that sent the beacon
L3Address srcAddr = L3AddressResolver().resolve(msg->getSenderModule()->getFullPath().c_str());
for (auto &entry : messageTable)
{
if (entry.first != srcAddr)
{
for (auto &packet : entry.second)
{
send(packet->dup(), “toMacLayer”);
}
}
}
delete msg;
}
void Epidemic::handleUpperLayerPacket(cPacket *packet)
{
L3Address destAddr = L3AddressResolver().resolve(packet->par(“destAddr”).stringValue());
messageTable[destAddr].push_back(packet);
messageTimestamps[packet->getId()] = simTime();
}
void Epidemic::handleLowerLayerPacket(cPacket *packet)
{
L3Address destAddr = L3AddressResolver().resolve(packet->par(“destAddr”).stringValue());
if (destAddr == interfaceTable->getInterface(0)->getIpv4Address())
{
send(packet, “toNetworkLayer”);
}
else
{
forwardMessage(packet);
}
}
void Epidemic::forwardMessage(cPacket *packet)
{
L3Address destAddr = L3AddressResolver().resolve(packet->par(“destAddr”).stringValue());
if (messageTable.find(destAddr) == messageTable.end())
{
messageTable[destAddr].push_back(packet);
messageTimestamps[packet->getId()] = simTime();
send(packet->dup(), “toMacLayer”);
}
else
{
delete packet;
}
}
Step 4: Integrate with Simulation Model
Fit in the Epidemic module into a network simulation model.
Network Configuration .ned File
To build a .ned file to outline the network topology.
network EpidemicNetwork
{
parameters:
@display(“bgb=600,400”);
submodules:
node1: StandardHost {
parameters:
@display(“p=100,200”);
}
node2: StandardHost {
parameters:
@display(“p=300,200”);
}
node3: StandardHost {
parameters:
@display(“p=500,200”);
}
connections:
node1.pppg++ <–> Eth10M <–> node2.pppg++;
node2.pppg++ <–> Eth10M <–> node3.pppg++;
node1.pppg++ <–> Eth10M <–> node3.pppg++;
}
Step 5: Configure the Simulation
To configure the simulation parameters in the omnetpp.ini file.
[General]
network = EpidemicNetwork
*.node*.pppg[*].queue.typename = “DropTailQueue”
*.node*.ipv4.routingTable = “inet.networklayer.routing.manet.Router”
*.node*.networkLayer.networkProtocol.typename = “Ipv4NetworkLayer”
*.node*.transportLayer.tcp.typename = “Tcp”
*.node*.transportLayer.udp.typename = “Udp”
*.node*.application[*].typename = “UdpBasicApp”
*.node*.application[*].destAddresses = “node1” // Set destination as needed
*.node*.application[*].destPort = 2000
*.node*.application[*].startTime = uniform(0s, 10s)
*.node*.application[*].sendInterval = uniform(1s, 2s)
*.node*.application[*].packetLength = 512B
*.node1.app[0].typename = “Epidemic”
*.node2.app[0].typename = “Epidemic”
*.node3.app[0].typename = “Epidemic”
Step 6: Test and Debug
- Run Simulations: Effect simulations to test the conduct of the Epidemic module under different network conditions.
- Analyze Results: Confirm the correctness and performance of the implementation.
- Debugging: By using OMNeT++’s debugging tools to troubleshoot any problems.
We establish that define epidemic protocol, and their implementation in C++ and some coding to implement the Epidemic Protocol in OMNeT++. We deliver added details about to implementation of the Epidemic Protocol in OMNeT++ tool.
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