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How to Calculate Network Accounting in omnet++

To calculate the network accounting in OMNeT++ has essential to encompasses following and evaluating the usage of network resources by several entities like users, devices, or applications over time. Network accounting is usually contains monitoring bandwidth usage, data volume, connection time, and other metrics that are difficult for billing, auditing, and improving network performance.

Step-by-Step Implementations:

  1. Understand Network Accounting

Network accounting is the process of gathering data about network usage to understand how resources are utilized. General accounting metrics contain:

  • Bandwidth Usage: The amount of data transmitted and received.
  • Connection Time: The period of connections.
  • Data Volume: The total amount of data exchanged.
  • Resource Utilization: CPU, memory, or storage usage related with network activities.
  1. Set up a Network with Accounting Points

To build a network topology where accounting points like routers, switches, or servers view network traffic and resource usage in OMNeT++. These points will track the metrics required for network accounting.

Example: Define a Network with Accounting Points in NED

network AccountingNetwork {

submodules:

client: Node;

router: Router;       // Router acting as an accounting point

server: Server;       // Server that client interacts with

connections:

client.out++ –> router.in++;

router.out++ –> server.in++;

}

  1. Implement Accounting Logic

Denoting the accounting point like a router, execute the logic to measure and record numerous accounting metrics such as bandwidth usage, data volume, and connection time in the OMNeT++ module.

Example: Implementing Simple Accounting in a Router

#include <omnetpp.h>

using namespace omnetpp;

class AccountingRouter : public cSimpleModule {

private:

long totalDataTransmitted = 0;

long totalDataReceived = 0;

simtime_t connectionStartTime;

simtime_t totalConnectionTime;

int connectionCount = 0;

protected:

virtual void initialize() override {

connectionStartTime = -1;  // No connection active initially

}

virtual void handleMessage(cMessage *msg) override {

// Track data volume

totalDataTransmitted += msg->getByteLength();

// Record connection time

if (connectionStartTime < 0) {

connectionStartTime = simTime();

connectionCount++;

}

send(msg, “out”);

// Track data received

if (msg->arrivedOn(“in”)) {

totalDataReceived += msg->getByteLength();

}

}

virtual void finish() override {

// Calculate total connection time

if (connectionStartTime >= 0) {

totalConnectionTime += simTime() – connectionStartTime;

}

// Record accounting metrics

recordScalar(“Total Data Transmitted (bytes)”, totalDataTransmitted);

recordScalar(“Total Data Received (bytes)”, totalDataReceived);

recordScalar(“Total Connection Time (seconds)”, totalConnectionTime.dbl());

recordScalar(“Total Connections”, connectionCount);

}

};

Define_Module(AccountingRouter);

  1. Simulate Traffic and Resource Usage

Create traffic from the client to the server over the accounting router. The router will track the metrics connected to data transmission, connection times, and resource usage.

Example: Traffic Simulation with Accounting

class Client : public cSimpleModule {

protected:

virtual void initialize() override {

// Start generating traffic after a delay

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

}

virtual void handleMessage(cMessage *msg) override {

// Send the data to the server through the router

send(msg, “out”);

}

};

  1. Monitor and Record Accounting Metrics

Observe the metrics accumulated by the accounting router, like total data transmitted, total data received, connection time, and the number of connections. It will be recorded for post-simulation analysis.

Example: Recording Accounting Metrics

class AccountingRouter : public cSimpleModule {

private:

long totalDataTransmitted = 0;

long totalDataReceived = 0;

simtime_t connectionStartTime;

simtime_t totalConnectionTime;

int connectionCount = 0;

protected:

virtual void initialize() override {

connectionStartTime = -1;

}

virtual void handleMessage(cMessage *msg) override {

totalDataTransmitted += msg->getByteLength();

if (connectionStartTime < 0) {

connectionStartTime = simTime();

connectionCount++;

}

send(msg, “out”);

if (msg->arrivedOn(“in”)) {

totalDataReceived += msg->getByteLength();

}

}

virtual void finish() override {

if (connectionStartTime >= 0) {

totalConnectionTime += simTime() – connectionStartTime;

}

recordScalar(“Total Data Transmitted (bytes)”, totalDataTransmitted);

recordScalar(“Total Data Received (bytes)”, totalDataReceived);

recordScalar(“Total Connection Time (seconds)”, totalConnectionTime.dbl());

recordScalar(“Total Connections”, connectionCount);

}

};

  1. Analyse Accounting Data

Investigate the collected accounting data, after running the simulation:

  • Data Volume: How much data was received and transmitted by the router?
  • Connection Duration: What was the total connection time?
  • Resource Utilization: How successfully were the network resources utilized?
  • Billing and Auditing: Can the gathered data be used for billing or auditing purposes?
  1. Advanced Accounting Features

For more complex accounting scenarios, we may need to:

  • Implement Per-User or Per-Application Accounting: Track metrics for each users or applications.
  • Simulate Differentiated Services: Follow resource usage based on various classes of service.
  • Implement Real-Time Accounting: Always watch and report on accounting metrics in real-time.
  1. Example Scenario

In this example, the AccountingRouter module tracks, connection times, the number of connections, and the total data transmitted and received. This metrics are recorded for post-simulation analysis to assess network usage and performance.

network AccountingExample {

submodules:

client: Client;

router: AccountingRouter;

server: cModule;

connections:

client.out++ –> router.in++;

router.out++ –> server.in++;

}

  1. Post-Simulation Analysis

To observe the recorded accounting metrics, like the total data transmitted and received, connection times, and resource utilization by using OMNeT++’s built-in analysis tools. This analysis will support we understand how network resources were used and can update decisions related to billing, capacity planning, and network optimization.

Overall, from the above procedure and some examples we shown how to calculate the Network Accounting in OMNeT++ module. Further details we will provide according to your requirements.

Please provide us with the details of your parameters, and we will assist you with your Network Accounting project. We possess all the necessary tools and developers to ensure the successful execution of your work.

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