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
- Install OMNeT++: download and install the new version of OMNeT++ from it.
- 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
- Run Simulations: Perform simulations to test the act of the BGP and OSPF modules under different network situations.
- Analyse Results: Validate the correctness and concert of the implementation.
- 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.