How to implement route source protocol in OMNeT++
To implement the route source protocol in OMNeT++ has needs to generate the modules that emulates the features of a protocol that liable for decisive and transmitting the route information inside a network. the given below is the detailed procedure to implement the basic route source protocol, often found in routing protocols like Routing Information Protocol (RIP) or a custom protocol.
Step-by-Step Implementation:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++: Download and install the latest version of OMNeT++ froOMNeT++
- Install INET Framework: Download and install the INET framework from the INET repository.
Step 2: Define the Route Source Protocol
In an instance, we will generate a basic route source protocol that broadcasts routing information to all nodes in the network.
Define the Module in .ned File
Create a .ned file for the route source protocol module.
simple RouteSourceProtocol
{
parameters:
@display(“i=block/cogwheel”);
double broadcastInterval @unit(s) = default(10s); // Interval for broadcasting route information
gates:
input fromNetworkLayer;
output toNetworkLayer;
input fromMacLayer;
output toMacLayer;
}
Implement the Module in C++
Create the corresponding .cc and .h files.
RouteSourceProtocol.h
#ifndef __ROUTESOURCEPROTOCOL_H_
#define __ROUTESOURCEPROTOCOL_H_
#include <omnetpp.h>
#include “inet/networklayer/contract/IRoutingTable.h”
#include “inet/common/INETDefs.h”
#include “inet/networklayer/common/L3AddressResolver.h”
#include <map>
using namespace omnetpp;
using namespace inet;
class RouteSourceProtocol : public cSimpleModule
{
private:
double broadcastInterval;
IRoutingTable *routingTable;
cMessage *broadcastMsg;
std::map<L3Address, int> routeTable; // Stores routes and their hop counts
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void broadcastRoutes();
void processRouteUpdate(cMessage *msg);
void handleUpperLayerPacket(cPacket *packet);
void handleLowerLayerPacket(cPacket *packet);
public:
RouteSourceProtocol();
virtual ~RouteSourceProtocol();
};
#endif
RouteSourceProtocol.cc
#include “RouteSourceProtocol.h”
Define_Module(RouteSourceProtocol);
RouteSourceProtocol::RouteSourceProtocol()
{
broadcastMsg = nullptr;
}
RouteSourceProtocol::~RouteSourceProtocol()
{
cancelAndDelete(broadcastMsg);
}
void RouteSourceProtocol::initialize()
{
broadcastInterval = par(“broadcastInterval”);
routingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);
broadcastMsg = new cMessage(“broadcastRoutes”);
scheduleAt(simTime() + broadcastInterval, broadcastMsg);
}
void RouteSourceProtocol::handleMessage(cMessage *msg)
{
if (msg == broadcastMsg)
{
broadcastRoutes();
scheduleAt(simTime() + broadcastInterval, broadcastMsg);
}
else if (strcmp(msg->getName(), “RouteUpdate”) == 0)
{
processRouteUpdate(msg);
}
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 RouteSourceProtocol::broadcastRoutes()
{
cMessage *routeUpdate = new cMessage(“RouteUpdate”);
// Add routing information to the update message
for (const auto &entry : routeTable)
{
routeUpdate->addPar(entry.first.str().c_str()) = entry.second;
}
send(routeUpdate, “toMacLayer”);
}
void RouteSourceProtocol::processRouteUpdate(cMessage *msg)
{
// Process received route update message
for (int i = 0; i < msg->getParList().size(); ++i)
{
const char *key = msg->getParList().get(i).getName();
int hopCount = msg->par(key).intValue();
L3Address addr(key);
routeTable[addr] = hopCount;
// Add route to the routing table
Ipv4Route *route = new Ipv4Route();
route->setDestination(addr.toIpv4());
route->setMetric(hopCount);
routingTable->addRoute(route);
}
delete msg;
}
void RouteSourceProtocol::handleUpperLayerPacket(cPacket *packet)
{
// Handle packets from upper layer
L3Address destAddr = L3AddressResolver().resolve(packet->par(“destAddr”).stringValue());
if (routeTable.find(destAddr) != routeTable.end())
{
send(packet, “toMacLayer”);
}
else
{
delete packet;
}
}
void RouteSourceProtocol::handleLowerLayerPacket(cPacket *packet)
{
// Handle packets from lower layer
L3Address destAddr = L3AddressResolver().resolve(packet->par(“destAddr”).stringValue());
if (routeTable.find(destAddr) != routeTable.end())
{
send(packet, “toNetworkLayer”);
}
else
{
delete packet;
}
}
Step 3: Integrate with Simulation Model
Assimilate RouteSourceProtocol module into a network simulation model.
Network Configuration .ned File
Create a .ned file to define the network topology.
network RouteSourceNetwork
{
parameters:
@display(“bgb=600,400”);
submodules:
host1: StandardHost {
parameters:
@display(“p=100,200”);
}
host2: StandardHost {
parameters:
@display(“p=300,200”);
}
router: StandardHost {
parameters:
@display(“p=200,100”);
}
connections:
host1.ethg++ <–> Eth10M <–> router.ethg++;
host2.ethg++ <–> Eth10M <–> router.ethg++;
}
Step 4: Configure the Simulation
Configure the simulation parameters in the omnetpp.ini file.
network = RouteSourceNetwork
*.host*.eth[*].mac.typename = “EthernetMac”
*.host*.ipv4.arp.typename = “GlobalArp”
*.host*.ipv4.routingTable.netmaskRoutes = “true”
*.router.eth[*].mac.typename = “EthernetMac”
*.router.eth[*].mac.promiscuous = true
*.host1.ipv4.config = “host1.config”
*.host2.ipv4.config = “host2.config”
*.host1.ipv4.routingTable.netmaskRoutes = “true”
*.host2.ipv4.routingTable.netmaskRoutes = “true”
*.router.app[0].typename = “RouteSourceProtocol”
*.router.app[0].broadcastInterval = 10s
Step 5: Test and Debug
- Run Simulations: implement simulations to check the features of RouteSourceProtocol module under several network conditions.
- Analyse Results: Verify the correctness and performance of your implementation.
- Debugging: Use OMNeT++’s debugging tools to troubleshoot any issues.
In this page, we clearly understood and get knowledge about how to transmit the information in the route source network simulation using the OMNeT++ simulator too. Additional specifics will be provided on the methodology of the route source protocol in other simulations tools. Get implementation ideas using the OMNeT++ tool for your projects.