How to Calculate Network Logging in omnet++

To calculate the network logging in OMNeT++ includes tracking and recording several events and activities in the network, like packet routing, data transmission, errors, or security incidents. This logging can be used for complicance purposes, performance analysis, security auditing, compliance purposes and troubleshooting. Given below is a procedure to implement and calculate network logging in OMNeT++.

Step-by-Step Implementations:

1. Understand Network Logging

Network logging denotes to the process of capturing and storing information about network events. Usually logged information contains:

• Packet Transmission and Reception: Logs of when and where packets are sent and received.
• Errors and Failures: Logs of transmission errors, packet drops, or device failures.
• Security Incidents: Logs of unauthorized access attempts, suspicious activities, or policy violations.
• Performance Metrics: Logs of latency, throughput, and other performance indicators.

2. Set up a Network with Logging Points

In OMNeT++, make a network topology with logging points at strategic locations, like routers, firewalls, or servers. These points will be responsible for logging events and activities.

Example: Define a Network with Logging Points in NED

network LoggingNetwork {

submodules:

client: Client;

router: LoggingRouter;  // Router with logging capabilities

server: Server;

connections:

client.out++ –> router.in++;

router.out++ –> server.in++;

}

3. Implement Logging Logic

In the OMNeT++ module signifying the logging point like a router, execute the logic to capture and log events. The logs can be stored in a file, presented in the simulation output, or processed in real-time.

Example: Implementing Logging in a Router

#include <omnetpp.h>

using namespace omnetpp;

class LoggingRouter : public cSimpleModule {

private:

std::ofstream logFile;

protected:

virtual void initialize() override {

// Open a log file to store the logs

logFile.open(“network_log.txt”);

}

virtual void handleMessage(cMessage *msg) override {

// Log the packet transmission

logEvent(msg, “Packet received”);

// Forward the packet to the next hop

send(msg, “out”);

// Log the packet forwarding

logEvent(msg, “Packet forwarded”);

}

void logEvent(cMessage *msg, const char *eventDescription) {

// Get the simulation time and the module’s name

simtime_t currentTime = simTime();

const char *moduleName = getFullPath().c_str();

// Log the event to the log file

logFile << currentTime << ” – ” << moduleName << ” – ” << eventDescription << “: ” << msg->getName() << std::endl;

// Optionally, log to the simulation output

EV << currentTime << ” – ” << moduleName << ” – ” << eventDescription << “: ” << msg->getName() << std::endl;

}

virtual void finish() override {

// Close the log file at the end of the simulation

logFile.close();

}

};

Define_Module(LoggingRouter);

4. Simulate Traffic and Capture Logs

Make traffic from the client to the server over the logging router. The router will capture and log each packet’s transmission and forwarding events.

Example: Traffic Simulation with Logging

class Client : public cSimpleModule {

protected:

virtual void initialize() override {

// Start generating traffic after a delay

scheduleAt(simTime() + par(“sendInterval”).doubleValue(), new cMessage(“dataPacket”));

}

virtual void handleMessage(cMessage *msg) override {

// Send the data to the server through the router

send(msg, “out”);

}

};

5. Monitor and Analyse Logs

The logs generated by the logging points can be evaluated to know network behaviour, identify issues, and assess performance. The logs can be processed in real-time or reviewed after the simulation.

Example: Analysing Logs

After the simulation, the log file network_log.txt will encompass in depth records of all logged events. We can open this file to review the logs and consider them for:

• Transmission and Reception Events: verify when and where packets were sent and received.
• Error Detection: View for any logged errors or failures in packet transmission.
• Performance Analysis: Compute latency, throughput, or other metrics based on the timestamps and events in the logs.
• Security Auditing: Find any suspicious or unauthorized activities logged by the system.

6. Advanced Logging Features

For more difficult logging requirements, we might need to:

• Implement Selective Logging: Log only particular kinds of events, like errors or security incidents.
• Simulate Real-Time Log Processing: Process and analyse logs in real-time to trigger alerts or take corrective actions.
• Implement Centralized Logging: Gather logs from several network nodes and aggregate them in a central log server for easier analysis.

7. Example Scenario

In the given example, the LoggingRouter module logs all packet it receives and forwards. These logs contain the simulation time, the module name, and a description of the event. The logs are written to both a file and the simulation output.

network LoggingExample {

submodules:

client: Client;

router: LoggingRouter;

server: cModule;

connections:

client.out++ –> router.in++;

router.out++ –> server.in++;

}

8. Post-Simulation Log Analysis

We can analyse the log file to extract valuable insights about the network’s performance, behaviour, and security after the simulation. The logs can be parsed, filtered, and visualized using external tools if desired.

Over this paper, we are given procedure and examples to implement and calculate the Network Logging in OMNeT++. Further valuable insights will be provided based on your requests.

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