How to Simulate Daisy Chain Topology Projects Using OMNeT++

To simulate a Daisy Chain Topology using OMNeT++, which encompasses making a sequences of nodes in which each node is connected to accurately two other nodes, excepting the endpoints (which have only one connection). This forms a linear chain that is generally utilized in bus-like communication systems, in which informations is passed from one node to the next.

We offer step-by-step guidelines on how to replicate a daisy chain topology in OMNeT++ using the INET framework:

Steps to Simulate Daisy Chain Topology in OMNeT++

1. Install OMNeT++ and INET Framework:

Make sure OMNeT++ and the INET framework are installed and appropriately set up. The INET framework delivers numerous network node types and utilities that are useful in configuring this type of topology.

• We can download and install OMNeT++.
• Download and install the INET Framework.

2. Define Daisy Chain Topology in NED File:

A daisy chain topology is a linear chain in which each node is connected to its immediate neighbour. We can be described this network topology using a NED file.

Here is a simple instance of a NED file that makes a daisy chain topology:

network DaisyChainNetwork

{

parameters:

int numNodes = default(5); // Number of nodes in the daisy chain

submodules:

// Define the nodes in the daisy chain

node[numNodes]: <NodeType> {

@display(“p=100+100*i,100”);  // Distribute nodes in a linear fashion

}

connections allowunconnected:

// Connect each node to its immediate neighbor

for i=0..numNodes-2 {

node[i].ethg++ <–> Eth100M <–> node[i+1].ethg++;

}

}

In this example:

• numNodes describes the amount of nodes in the daisy chain.
• The node[numNodes] array defines the nodes, which will form the daisy chain.
• The for loop makes the point-to-point connections among the consecutive nodes, forming the chain.
• ethg++ is the Ethernet gate for each node, and Eth100M signifies the Ethernet link among them with a bandwidth of 100 Mbps.

3. Define Node Types in NED:

We can be utilized StandardHost from the INET framework for the node definitions, or we can make a custom node type based on  the particular requirements.

Example:

import inet.node.inet.StandardHost;

module NodeType extends StandardHost

{

parameters:

@display(“i=device/laptop”);  // Use an icon to represent each node

}

This node type can be utilized for each node in the daisy chain, and the StandardHost module offers simple network functionality like IP, TCP, and UDP capabilities.

4. Configure INI File:

The omnetpp.ini file controls various aspects of the simulation, including network parameters, traffic generation, and simulation duration.

Here’s an example omnetpp.ini configuration for the daisy chain topology:

[General]

network = DaisyChainNetwork

sim-time-limit = 20s   # Simulation time

# Configuring IP addresses for each node in the daisy chain

*.node[*].networkLayer.ipv4.address = “10.0.0.x”  # Assign IP addresses automatically

# Configuring a simple traffic pattern (TCP)

*.node[0].numApps = 1

*.node[numNodes-1].numApps = 1

# Define a TCP client on the first node (Node 0) and a TCP server on the last node (Node numNodes-1)

*.node[0].app[0].typename = “TcpBasicClientApp”

*.node[0].app[0].connectAddress = “10.0.0.5”  # IP of the last node

*.node[0].app[0].startTime = 1s

*.node[0].app[0].stopTime = 19s

*.node[numNodes-1].app[0].typename = “TcpBasicServerApp”  # TCP server on the last node

This configuration:

• Allocates IP addresses to each node.
• Describes a TCP client on the first node (Node 0) to transmit data to the last node (Node N).
• Defines a TCP server on the end node to receive traffic from the initial node.
• Changes the start and stop times for the traffic generation.

5. Traffic Generation Using TCP or UDP:

We can insert traffic generation among the nodes using TCP or UDP, based on the requirements. Here’s how to set up UDP traffic among the nodes.

Example using UDP traffic:

# Configuring UDP traffic from Node 0 to the last node in the chain

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

*.node[0].app[0].destAddresses = “10.0.0.5”  # Destination is the last node

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

*.node[0].app[0].packetLength = 1024B

*.node[0].app[0].sendInterval = uniform(1s, 2s)

*.node[0].app[0].startTime = 1s

*.node[0].app[0].stopTime = 19s

# Configuring Node 5 to act as a UDP sink to receive the traffic

*.node[4].app[0].typename = “UdpSink”

*.node[4].app[0].localPort = 5000

6. Run the Simulation:

• After configuring the NED and INI files, we compile the project and run the simulation in the OMNeT++ IDE.
• Utilize Qtenv for real-time visualization of the network, displaying packet transmissions along the daisy chain.

7. Analyze Results:

OMNeT++ delivers detailed logs and statistics for investigating the performance of the simulation. We can examine parameters like:

• Throughput: Estimate the data transmitted among the nodes.
• Latency: Assess the delay among packet transmissions.
• Packet Loss: Check for dropped packets along the chain.

The Plove tool can be utilized to generate plots for several performance parameters.

8. Advanced Features (Optional):

We can prolong the daisy chain simulation with additional aspects, like:

1. Error Models: Launch link failures or packet loss among the nodes to replicate real-world network conditions.
2. Energy Models: Monitor the energy consumption of nodes in the chain (useful for wireless daisy chain setups).
3. Routing Protocols: Utilize dynamic routing if the daisy chain requires to support mobile nodes or adaptive behaviour.

Summary:

• Topology: Describe a daisy chain network with nodes are connected in a linear sequence.
• Traffic: Utilize either TCP or UDP traffic generation to mimic data exchange among the initial and end nodes.
• Performance Analysis: Use OMNeT++’s tools to estimate parameters such as throughput, latency, and packet loss.

This projects will definitely helpful to you since it illustrated core concepts, common instructions with examples, and summary on how to simulate and analyse the Daisy Chain Topology in OMNeT++ tool. Additional insights will be presented rely on your requirements.

For conducting simulations in Daisy Chain Topology Projects using the OMNeT++ tool, we will provide you with a comprehensive guide to achieve optimal results. If needed, we will offer additional insights tailored to your specific requirements, complete with simulation outcomes. Our team at phdprime.com is here to support you in navigating node operations, ensuring you receive the best guidance for your simulation and network evaluation endeavors.