How to Implement fastest protocol in OMNeT++
To implement a convention protocol in OMNeT++ to fix and use the fastest pathway in a network comprises crafty a protocol that always appraises the accessible ways and choose the one with the lowest invisibility.
The given below is a step-by-step process to implement the fastest protocol by using OMNeT++ and the INET framework.
Step-by-Step Implementations:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++: To download and install the up-to-date version of it from theOMNeT++
- Install INET Framework: To download and install the INET framework as of the INET repository.
Step 2: Define the Fastest Path Protocol
To build the essential .ned and C++ files for the Fastest Path protocol module.
Define the Module in .ned File
Make a .ned file for the protocol.
simple FastestPathProtocol
{
parameters:
@display(“i=block/network”);
double updateInterval @unit(s) = default(1s); // Interval for checking paths
gates:
input fromNetworkLayer;
output toNetworkLayer;
input fromMacLayer;
output toMacLayer;
}
Step 3: Implement the Fastest Path Protocol in C++
To build the corresponding .cc and .h files.
FastestPathProtocol.h
#ifndef __FASTESTPATHPROTOCOL_H_
#define __FASTESTPATHPROTOCOL_H_
#include <omnetpp.h>
#include “inet/common/INETDefs.h”
#include “inet/networklayer/contract/IRoutingTable.h”
#include “inet/networklayer/contract/IInterfaceTable.h”
#include “inet/networklayer/ipv4/Ipv4Header_m.h”
#include “inet/networklayer/ipv4/Ipv4Route.h”
#include “inet/networklayer/common/L3AddressResolver.h”
#include <map>
#include <vector>
using namespace omnetpp;
using namespace inet;
class FastestPathProtocol : public cSimpleModule
{
private:
double updateInterval;
IRoutingTable *routingTable;
IInterfaceTable *interfaceTable;
cMessage *updateMsg;
std::map<L3Address, std::vector<cPacket*>> packetQueue; // Stores packets by destination
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void checkPaths();
void handleUpperLayerPacket(cPacket *packet);
void handleLowerLayerPacket(cPacket *packet);
void forwardPacket(Ipv4Header *ipHeader, cPacket *packet);
void updateRoutingTable();
public:
FastestPathProtocol();
virtual ~FastestPathProtocol();
};
#endif
FastestPathProtocol.cc
#include “FastestPathProtocol.h”
Define_Module(FastestPathProtocol);
FastestPathProtocol::FastestPathProtocol()
{
updateMsg = nullptr;
}
FastestPathProtocol::~FastestPathProtocol()
{
cancelAndDelete(updateMsg);
}
void FastestPathProtocol::initialize()
{
updateInterval = par(“updateInterval”);
routingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);
interfaceTable = getModuleFromPar<IInterfaceTable>(par(“interfaceTableModule”), this);
updateMsg = new cMessage(“checkPaths”);
scheduleAt(simTime() + updateInterval, updateMsg);
}
void FastestPathProtocol::handleMessage(cMessage *msg)
{
if (msg == updateMsg)
{
checkPaths();
scheduleAt(simTime() + updateInterval, updateMsg);
}
else if (msg->arrivedOn(“fromNetworkLayer”))
{
handleUpperLayerPacket(check_and_cast<cPacket *>(msg));
}
else if (msg->arrivedOn(“fromMacLayer”))
{
handleLowerLayerPacket(check_and_cast<cPacket *>(msg));
}
else
{
delete msg;
}
}
void FastestPathProtocol::checkPaths()
{
// Logic to check the paths and update routing table with the fastest path
updateRoutingTable();
}
void FastestPathProtocol::handleUpperLayerPacket(cPacket *packet)
{
Ipv4Header *ipHeader = new Ipv4Header();
ipHeader->setSrcAddress(interfaceTable->getInterface(0)->getIpv4Address());
ipHeader->setDestAddress(packet->par(“destAddr”).stringValue());
packet->insertAtFront(ipHeader);
forwardPacket(ipHeader, packet);
}
void FastestPathProtocol::handleLowerLayerPacket(cPacket *packet)
{
Ipv4Header *ipHeader = check_and_cast<Ipv4Header *>(packet->removeAtFront<Ipv4Header>());
if (ipHeader->getDestAddress() == interfaceTable->getInterface(0)->getIpv4Address())
{
send(packet, “toNetworkLayer”);
}
else
{
forwardPacket(ipHeader, packet);
}
}
void FastestPathProtocol::forwardPacket(Ipv4Header *ipHeader, cPacket *packet)
{
Ipv4Route *route = routingTable->findBestMatchingRoute(ipHeader->getDestAddress());
if (route)
{
send(packet, “toMacLayer”);
}
else
{
delete packet;
}
}
void FastestPathProtocol::updateRoutingTable()
{
// Update the routing table with the fastest paths
// This function should measure path delays and update the routing table accordingly
}
Step 4: Integrate with Simulation Model
Take part the FastestPathProtocol module into a network simulation model.
Network Configuration .ned File
Form a .ned file to define the network topology.
network FastestPathNetwork
{
parameters:
@display(“bgb=600,400”);
submodules:
host1: StandardHost {
parameters:
@display(“p=100,200”);
}
host2: StandardHost {
parameters:
@display(“p=300,200”);
}
host3: StandardHost {
parameters:
@display(“p=500,200”);
}
router: Router {
parameters:
@display(“p=300,100”);
}
connections:
host1.pppg++ <–> Eth10M <–> router.pppg++;
host2.pppg++ <–> Eth10M <–> router.pppg++;
host3.pppg++ <–> Eth10M <–> router.pppg++;
}
Step 5: Configure the Simulation
Organize the simulation parameters in the omnetpp.ini file.
[General]
network = FastestPathNetwork
**.pppg[*].queue.typename = “DropTailQueue”
**.ipv4.routingTable = “inet.networklayer.routing.manet.Router”
**.networkLayer.networkProtocol.typename = “Ipv4NetworkLayer”
**.transportLayer.tcp.typename = “Tcp”
**.transportLayer.udp.typename = “Udp”
**.application[*].typename = “UdpBasicApp”
**.application[*].destAddresses = “host1” // Set destination as needed
**.application[*].destPort = 2000
**.application[*].startTime = uniform(0s, 10s)
**.application[*].sendInterval = uniform(1s, 2s)
**.application[*].packetLength = 512B
**.app[0].typename = “FastestPathProtocol”
Step 6: Test and Debug
- Run Simulations: Complete simulations to test the conduct of the FastestPathProtocol module beneath several network conditions.
- Analyze Results: Verify the correctness and performance of the execution.
- Debugging: By using OMNeT++’s debugging tools to troubleshoot any concerns.
From the above notes, we know how to implement in C++, simulations and codes to implement the Fastest Protocol in OMNeT++. We provide implementation support Fastest Protocol in OMNeT++ for your projects.