How to Implement Network Protocol Testing in OMNeT++

To Implement network protocol testing in OMNeT++ has needs to emulate the network where can verify, measure and assess the performance of numerous network protocols. This process is usually contains to generate the realistic network topology, executing the protocol to be tested (if not already available in the INET framework), and setting up the simulation scenarios, execute the tests, and evaluate the outcomes. The below are the procedures on how to implement the network protocol testing in OMNeT++ tool:

Step-by-Step Implementation:

Step 1: Set Up OMNeT++ and INET Framework

1. Install OMNeT++:
   • Ensure OMNeT++ is installed on system. We need to download it from the OMNeT++
2. Install the INET Framework:
   • INET delivers a rich library of models for network protocols likeTCP, UDP, IP, routing protocols that can use for testing. Download INET from the INET GitHub repository.

Step 2: Create a New OMNeT++ Project

1. Create the Project:
   • Open OMNeT++ and generate a new OMNeT++ project through File > New > OMNeT++ Project.
   • Name the project such as  ProtocolTesting and set up the project directory.
2. Set Up Project Dependencies:
   • Make certain project references the INET Framework by right-clicking on your project in the Project Explorer, navigating to Properties > Project References, and testing the INET project.

Step 3: Define the Network Topology

1. Create a NED File:
   • Describe network topology using the NED language. This topology should conclude the essential components such as hosts, routers, switches, and links to simulate the network where the protocol will be tested.

Example:

network ProtocolTestingNetwork

{

submodules:

hostA: StandardHost;

hostB: StandardHost;

router1: Router;

router2: Router;

connections:

hostA.ethg++ <–> Eth10Mbps <–> router1.ethg++;

router1.ethg++ <–> Eth10Mbps <–> router2.ethg++;

router2.ethg++ <–> Eth10Mbps <–> hostB.ethg++;

}

1. Configure Network Parameters:
   • Set up link parameters like bandwidth, delay, and packet loss to reflect testing requirements.

Step 4: Implement the Network Protocol (If Necessary)

If the protocol want to test is not already available in the INET Framework, we need to implement it:

1. Define the Protocol Modules:
   • Generate NED modules and C++ classes that implement the protocol logic, contain the packet handling, state management, and interactions with other layers like transport or network layer.

Example (NED for a custom protocol):

simple CustomProtocol

{

parameters:

@display(“i=block/cogwheel”);

gates:

inout lowerLayerIn;

inout lowerLayerOut;

}

Example (C++ for handling messages):

void CustomProtocol::handleMessage(cMessage *msg) {

if (msg->arrivedOn(“lowerLayerIn”)) {

processIncomingPacket(msg);

} else {

processUpperLayerData(msg);

}

}

void CustomProtocol::processIncomingPacket(cMessage *msg) {

// Implement protocol-specific logic

}

void CustomProtocol::processUpperLayerData(cMessage *msg) {

// Implement protocol-specific logic

}

1. Integrate with Existing Stack:
   • If your protocol operates at a specific layer such as network, transport, make sure it  interacts correctly with other layers in the protocol stack.

Step 5: Set Up Simulation Scenarios

1. Configure the Simulation in omnetpp.ini:
   • Set up various scenarios for testing like numerous traffic patterns, network topologies, or environmental conditions like varying delay, jitter, or packet loss.

Example:

network = ProtocolTestingNetwork

sim-time-limit = 100s

# Traffic configuration

*.hostA.numApps = 1

*.hostA.app[0].typename = “UdpBasicApp”

*.hostA.app[0].destAddress = “hostB”

*.hostA.app[0].destPort = 5000

*.hostA.app[0].messageLength = 1024B

*.hostA.app[0].sendInterval = exponential(1s)

# Enable logging and tracing

**.scalar-recording = true

**.vector-recording = true

1. Create Multiple Scenarios:
   • Use multiple configuration files or sections within omnetpp.ini to validate the various scenarios. For example, vary traffic loads, introduce link failures, or simulate mobility in wireless networks.

Step 6: Run the Simulation

1. Compile the Project:
   • Make sure everything is correctly executed and compiled.
2. Run Simulations:
   • Implement the simulations using OMNeT++’s IDE or command line. Monitor the features of the protocol under diverse scenarios.

Step 7: Analyse the Results

1. Collect Performance Metrics:
   • Assess the key performance metrics like throughput, latency, packet loss, jitter, and protocol overhead. OMNeT++ offers tools for visualizing and exporting these metrics.

Example (metrics to track):

1. • Throughput: Measure the rate at which data is successfully transferred from one point to another.
   • Latency: Measure the time taken for a packet to travel from the source to the destination.
   • Packet Loss: Track the number of packets that are lost in the network.
   • Jitter: Measure the variation in packet arrival times.
2. Use the OMNeT++ Analysis Tools:
   • OMNeT++ offers several tools for evaluating simulation results:
     • Scalars and Vectors: View and measure scalar and vector outcomes in the qtenv or export them to a CSV file for further analysis.
     • Plove: A tool to plot and analyze vector data.
     • Akaros: A statistical analysis tool for simulation data.
3. Compare with Expected Outcomes:
   • Associate the simulation outcomes with the expected characteristics or theoretical predictions. This helps to verify the correctness and performance of the protocol under test.

Step 8: Refine and Optimize the Protocol

1. Refine Protocol Implementation:
   • Based on the test outcomes, refine the protocol to address any difficulties like inefficiencies, high overhead, or unexpected behaviour.
2. Optimize Performance:
   • Focus on improved performance under numerous conditions contains high traffic loads, poor network conditions, or mobility.
3. Repeat Testing:
   • Run additional simulations after making adjustments to verify the enhancements and make sure the protocol meets performance goals.

Step 9: Document and Report Findings

1. Document the Simulation Setup:
   • Clearly document the network topology, configuration parameters, and scenarios used in the tests.
2. Report Performance Analysis:
   • Arrange a report that contains detailed performance analysis, comparisons with other protocols (if applicable), and insights into the protocol’s features under diverse criteria.
3. Discuss Potential Improvements:
   • To deliver recommendations for additional enhancements or extensions to the protocol based on the testing outcomes.

From the above modules, we had successfully implemented and executed the network protocol testing in OMNeT++  that has generate the network topology then validate , evaluate the performance of various network protocols in the real networks. We also offer the additional information regarding the network protocol.

Additional assistance with Network Protocol Testing in the OMNeT++ tool will be provided by us for your reasech work with simulation results , please feel free to reach out to us. We are committed to offering you the most effective project execution strategies.