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How to Implement isp protocols in OMNeT++

To implement the ISP which is Internet Service Provider protocols in OMNeT++ include mimicking the performance of network protocols usually used by ISPs for routing and managing traffic. ISP protocols can involve BGP that is Border Gateway Protocol, MPLS is Multiprotocol Label Switching, OSPF which is Open Shortest Path First, etc. The below process is demonstrate on implement a simple ISP-like situation in OMNeT++ by using the INET framework.

Step-by-Step Implementations:

Step 1: Set Up OMNeT++ and INET Framework

  1. Install OMNeT++:  download and install the new version of OMNeT++ from it.
  2. Install INET Framework: From the INET repository to download and install the INET framework.

Step 2: Choose the Protocols to Implement

To implement BGP and OSPF, are usually used by ISPs for external and internal routing, respectively.

Step 3: Implement BGP

Define the BGP Module in .ned File

Build a .ned file for the BGP protocol module.

simple BGP

{

parameters:

@display(“i=block/router”);

string asId; // Autonomous System ID

double keepaliveInterval @unit(s) = default(30s); // Interval for sending keepalive messages

gates:

input fromNetworkLayer;

output toNetworkLayer;

input fromPeer;

output toPeer;

}

Implement the BGP Module in C++

Make the corresponding .cc and .h files.

BGP.h

#ifndef __BGP_H_

#define __BGP_H_

#include <omnetpp.h>

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

#include “inet/common/INETDefs.h”

#include <map>

#include <set>

using namespace omnetpp;

using namespace inet;

class BGP : public cSimpleModule

{

private:

std::string asId;

double keepaliveInterval;

IRoutingTable *routingTable;

cMessage *keepaliveMsg;

std::map<L3Address, std::string> peerTable; // Maps peer addresses to their AS IDs

std::set<L3Address> advertisedRoutes; // Tracks advertised routes

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

void sendKeepalive();

void processKeepalive(cMessage *msg);

void processUpdate(cMessage *msg);

void processOpen(cMessage *msg);

void processNotification(cMessage *msg);

void advertiseRoute(const L3Address &prefix);

void withdrawRoute(const L3Address &prefix);

public:

BGP();

virtual ~BGP();

};

#endif

BGP.cc

#include “BGP.h”

Define_Module(BGP);

BGP::BGP()

{

keepaliveMsg = nullptr;

}

BGP::~BGP()

{

cancelAndDelete(keepaliveMsg);

}

void BGP::initialize()

{

asId = par(“asId”).stringValue();

keepaliveInterval = par(“keepaliveInterval”);

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

keepaliveMsg = new cMessage(“sendKeepalive”);

scheduleAt(simTime() + keepaliveInterval, keepaliveMsg);

}

void BGP::handleMessage(cMessage *msg)

{

if (msg == keepaliveMsg)

{

sendKeepalive();

scheduleAt(simTime() + keepaliveInterval, keepaliveMsg);

}

else if (strcmp(msg->getName(), “Keepalive”) == 0)

{

processKeepalive(msg);

}

else if (strcmp(msg->getName(), “Update”) == 0)

{

processUpdate(msg);

}

else if (strcmp(msg->getName(), “Open”) == 0)

{

processOpen(msg);

}

else if (strcmp(msg->getName(), “Notification”) == 0)

{

processNotification(msg);

}

else if (dynamic_cast<cPacket *>(msg))

{

// Handle incoming data packets if necessary

}

else

{

// Handle other messages

}

}

void BGP::sendKeepalive()

{

cMessage *keepalive = new cMessage(“Keepalive”);

send(keepalive, “toPeer”);

}

void BGP::processKeepalive(cMessage *msg)

{

// Process received keepalive message

delete msg;

}

void BGP::processUpdate(cMessage *msg)

{

// Process received update message

delete msg;

}

void BGP::processOpen(cMessage *msg)

{

// Process received open message

delete msg;

}

void BGP::processNotification(cMessage *msg)

{

// Process received notification message

delete msg;

}

void BGP::advertiseRoute(const L3Address &prefix)

{

cMessage *update = new cMessage(“Update”);

update->addPar(“prefix”) = prefix.str().c_str();

send(update, “toPeer”);

advertisedRoutes.insert(prefix);

}

void BGP::withdrawRoute(const L3Address &prefix)

{

cMessage *update = new cMessage(“Update”);

update->addPar(“withdrawnPrefix”) = prefix.str().c_str();

send(update, “toPeer”);

advertisedRoutes.erase(prefix);

}

Step 4: Implement OSPF

Define the OSPF Module in .ned File

Form a .ned file for the OSPF protocol module.

simple OSPF

{

parameters:

@display(“i=block/router”);

double helloInterval @unit(s) = default(10s); // Interval for sending hello messages

gates:

input fromNetworkLayer;

output toNetworkLayer;

input fromNeighbor;

output toNeighbor;

}

Implement the OSPF Module in C++

Create the corresponding .cc and .h files.

OSPF.h

#ifndef __OSPF_H_

#define __OSPF_H_

#include <omnetpp.h>

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

#include “inet/common/INETDefs.h”

#include <map>

#include <set>

using namespace omnetpp;

using namespace inet;

class OSPF : public cSimpleModule

{

private:

double helloInterval;

IRoutingTable *routingTable;

cMessage *helloMsg;

std::map<L3Address, bool> neighborTable; // Tracks neighbors

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

void sendHello();

void processHello(cMessage *msg);

void processLSA(cMessage *msg);

public:

OSPF();

virtual ~OSPF();

};

#endif

OSPF.cc

#include “OSPF.h”

Define_Module(OSPF);

OSPF::OSPF()

{

helloMsg = nullptr;

}

OSPF::~OSPF()

{

cancelAndDelete(helloMsg);

}

void OSPF::initialize()

{

helloInterval = par(“helloInterval”);

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

helloMsg = new cMessage(“sendHello”);

scheduleAt(simTime() + helloInterval, helloMsg);

}

void OSPF::handleMessage(cMessage *msg)

{

if (msg == helloMsg)

{

sendHello();

scheduleAt(simTime() + helloInterval, helloMsg);

}

else if (strcmp(msg->getName(), “Hello”) == 0)

{

processHello(msg);

}

else if (strcmp(msg->getName(), “LSA”) == 0)

{

processLSA(msg);

}

else if (dynamic_cast<cPacket *>(msg))

{

// Handle incoming data packets

L3Address dest = L3AddressResolver().resolve(msg->par(“destAddr”).stringValue());

if (routingTable->findBestMatchingRoute(dest))

{

// Forward the packet to the next hop

send(msg, “toNetworkLayer”);

}

else

{

// Drop the packet if no route found

delete msg;

}

}

else

{

// Handle other messages

}

}

void OSPF::sendHello()

{

cMessage *hello = new cMessage(“Hello”);

send(hello, “toNeighbor”);

}

void OSPF::processHello(cMessage *msg)

{

// Process received hello message

L3Address neighbor = L3AddressResolver().resolve(msg->getSenderModule()->getFullPath().c_str());

neighborTable[neighbor] = true;

delete msg;

}

void OSPF::processLSA(cMessage *msg)

{

// Process received LSA message

delete msg;

}

Step 5: Integrate with Simulation Model

Integrate the BGP and OSPF modules into a network simulation model.

Network Configuration .ned File

network ISPNetwork

{

submodules:

router1: StandardHost {

parameters:

@display(“p=100,100”);

asId = “AS1”;

}

router2: StandardHost {

parameters:

@display(“p=300,100”);

asId = “AS2”;

}

// Add more routers as needed

connections:

router1.pppg++ <–> { @display(“m=100,100”); } <–> router2.pppg++;

}

omnetpp.ini Configuration

[General]

network = SPNetwork

*.router*.pppg[*].queue.typename = “DropTailQueue”

*.router*.ipv4.routingTable = “inet.networklayer.routing.manet.Router”

*.router*.networkLayer.networkProtocol.typename = “IPv4NetworkLayer”

*.router*.transportLayer.tcp.typename = “Tcp”

*.router*.transportLayer.udp.typename = “Udp”

*.router*.application[*].typename = “UdpBasicApp”

*.router*.application[*].destAddresses = “router1”  // Set destination as needed

*.router*.application[*].destPort = 2000

*.router*.application[*].startTime = uniform(0s, 10s)

*.router*.application[*].sendInterval = uniform(1s, 2s)

*.router*.application[*].packetLength = 512B

*.router*.app[0].typename = “BGP”

*.router*.app[1].typename = “OSPF”

Step 6: Test and Debug

  1. Run Simulations: Perform simulations to test the act of the BGP and OSPF modules under different network situations.
  2. Analyse Results: Validate the correctness and concert of the implementation.
  3. Debugging: By  OMNeT++’s debugging tools to troubleshoot any issues.

Above the details, we are explore BGP module and we learn how to execute the ISP protocols in OMNeT++. Now we had an idea to give further plenty data depends on your needs.

Go through the key steps to set up the ISP protocol in the OMNeT++ tool and receive simulation assistance from our developers if you face any difficulties.

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