How to implement route access protocol in OMNeT++
To Implement a route access protocol in OMNeT++ has encompasses the various steps. In the route access protocol were frequently used mobile ad hoc networks (MANETs) that are Dynamic Source Routing (DSR) protocol. This will demonstrate the procedures on how to implement the DSR in OMNeT++ using the INET framework.
Step-by-Step Implementation:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++: Download and install the latest version of OMNeT++ from theOMNeT++
- Install INET Framework: Download and install the INET framework from the INET repository.
Step 2: Understand DSR Protocol
The DSR is a reactive routing protocol that uses source routing to transfer packets. Key concepts include:
- Route Requests (RREQs): Broadcast to discover routes.
- Route Replies (RREPs): Sent in response to RREQs.
- Route Error (RERRs): Indicate link breakages.
- Route Caches: Store routes to avoid frequent route discoveries.
Step 3: Create the DSR Protocol Module
Define the Module in .ned File
Create a .ned file for the DSR protocol module.
simple DSR
{
parameters:
double rreqTimeout @unit(s) = default(2s);
gates:
input fromNetworkLayer;
output toNetworkLayer;
input fromMacLayer;
output toMacLayer;
}
Implement the Module in C++
Create the corresponding .cc and .h files.
DSR.h
#ifndef __DSR_H_
#define __DSR_H_
#include <omnetpp.h>
#include “inet/networklayer/contract/IRoutingTable.h”
#include “inet/networklayer/common/L3AddressResolver.h”
#include “inet/networklayer/ipv4/IPv4Datagram.h”
#include <map>
#include <vector>
using namespace omnetpp;
using namespace inet;
class DSR : public cSimpleModule
{
private:
double rreqTimeout;
IRoutingTable *routingTable;
cMessage *rreqTimeoutMsg;
std::map<L3Address, std::vector<L3Address>> routeCache; // Route cache
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void sendRREQ(L3Address destAddr);
void processRREQ(cMessage *msg);
void sendRREP(L3Address destAddr);
void processRREP(cMessage *msg);
void processRERR(cMessage *msg);
public:
DSR();
virtual ~DSR();
};
#endif
DSR.cc
#include “DSR.h”
Define_Module(DSR);
DSR::DSR()
{
rreqTimeoutMsg = nullptr;
}
DSR::~DSR()
{
cancelAndDelete(rreqTimeoutMsg);
}
void DSR::initialize()
{
rreqTimeout = par(“rreqTimeout”);
routingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);
rreqTimeoutMsg = new cMessage(“rreqTimeout”);
}
void DSR::handleMessage(cMessage *msg)
{
if (msg == rreqTimeoutMsg)
{
// Handle RREQ timeout
}
else if (strcmp(msg->getName(), “RREQ”) == 0)
{
processRREQ(msg);
}
else if (strcmp(msg->getName(), “RREP”) == 0)
{
processRREP(msg);
}
else if (strcmp(msg->getName(), “RERR”) == 0)
{
processRERR(msg);
}
else
{
// Handle other messages
}
}
void DSR::sendRREQ(L3Address destAddr)
{
cMessage *rreq = new cMessage(“RREQ”);
rreq->addPar(“destAddr”) = destAddr.str().c_str();
send(rreq, “toNetworkLayer”);
}
void DSR::processRREQ(cMessage *msg)
{
L3Address destAddr = L3AddressResolver().resolve(msg->par(“destAddr”).stringValue());
// Implement processing of RREQ message
// …
delete msg;
}
void DSR::sendRREP(L3Address destAddr)
{
cMessage *rrep = new cMessage(“RREP”);
rrep->addPar(“destAddr”) = destAddr.str().c_str();
send(rrep, “toNetworkLayer”);
}
void DSR::processRREP(cMessage *msg)
{
L3Address destAddr = L3AddressResolver().resolve(msg->par(“destAddr”).stringValue());
// Implement processing of RREP message
// …
delete msg;
}
void DSR::processRERR(cMessage *msg)
{
// Implement processing of RERR message
delete msg;
}
Step 4: Integrate with Simulation Model
Incorporate DSR module into a network simulation model.
Network Configuration .ned File
network DSRNetwork
{
submodules:
host1: StandardHost {
parameters:
@display(“p=100,100”);
}
host2: StandardHost {
parameters:
@display(“p=300,100”);
}
// Add more hosts as needed
connections:
host1.pppg++ <–> { @display(“m=100,100”); } <–> host2.pppg++;
}
omnetpp.ini Configuration
network = DSRNetwork
*.host*.pppg[*].queue.typename = “DropTailQueue”
*.host*.ipv4.routingTable = “inet.networklayer.routing.manet.Router”
*.host*.networkLayer.networkProtocol.typename = “IPv4NetworkLayer”
*.host*.transportLayer.tcp.typename = “Tcp”
*.host*.transportLayer.udp.typename = “Udp”
*.host*.application[*].typename = “UdpBasicApp”
*.host*.application[*].destAddresses = “host1” // Set destination as needed
*.host*.application[*].destPort = 2000
*.host*.application[*].startTime = uniform(0s, 10s)
*.host*.application[*].sendInterval = uniform(1s, 2s)
*.host*.application[*].packetLength = 512B
*.host*.app[0].typename = “DSR”
Step 5: Test and Debug
- Run Simulations: Implement simulations to validate the characteristics of DSR module under numerous network conditions.
- Analyse Results: Evaluate the correctness and performance of implementation.
- Debugging: Use OMNeT++’s debugging tools to troubleshoot any challenges.
As we discussed earlier about how the route access protocol will perform in OMNeT++ simulator tool and we help to provide further implementation about how the route access protocol will adapt in diverse scenarios for your projects.