How to Simulate Tutorials point Routing Projects Using OMNeT++

To simulate routing projects using OMNeT++ inspired by TutorialsPoint or other educational resources has usually follow the same process to what we need for any routing protocol simulation. The goal is to execute common routing techniques such as OSPF, RIP, AODV, or custom protocols and replicate their characteristics in diverse network conditions.

Tutorials Point usually deliver theoretical overviews of these protocols, and we can utilize OMNeT++ with the INET Framework to replicate these routing projects practically.

Here’s a general guide for replicating routing projects, which can be adjusted for protocols enlightened on platforms such as Tutorials Point.

Steps to Simulate Tutorials point Routing Projects in OMNeT++

1. Install OMNeT++ and INET Framework

1. Download OMNeT++:
   • Download and install OMNeT++.
2. Install INET Framework:
   • INET deliver models for routing protocols such as RIP, OSPF, and AODV as well as network components such as routers and hosts.
   • Clone the INET repository:

git clone https://github.com/inet-framework/inet.git

1. • Import INET into OMNeT++ via File > Import > Existing Projects into Workspace, and select the inet directory.
   • Build the project by right-clicking on the inet project in OMNeT++ and selecting Build Project.

2. Choose a Routing Protocol to Simulate

TutorialsPoint cover multiple routing protocols, such as:

• Distance Vector Routing (e.g., RIP) – Uses the Bellman-Ford algorithm to calculate the shortest path.
• Link-State Routing (e.g., OSPF) – Utilize Dijkstra’s techniques to estimate the least-cost path.
• Ad-hoc Routing (e.g., AODV or DSR) – Dynamic protocols for wireless and mobile networks.
• Custom Routing Protocols – we can execute custom algorithms for educational purposes.

For this guide, let’s simulate RIP (Routing Information Protocol) using OMNeT++ as an example.

3. Define the Network Topology in NED

Generate a network topology using NED (Network Description) to denoted routers and hosts. We can adapt the topology according to the protocol that are simulating.

Example NED File for RIP-based Network (RoutingProjectNetwork.ned):

package routingproject;

import inet.node.inet.Router;

import inet.node.inet.StandardHost;

import inet.linklayer.ethernet.EthernetInterface;

import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;

network RoutingProjectNetwork

{

parameters:

int numRouters = 3;  // Define the number of routers

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=50,50”);

}

host1: StandardHost {

@display(“p=50,50”);

}

host2: StandardHost {

@display(“p=400,50”);

}

router[numRouters]: Router {

@display(“p=100+100*i,150”);

}

connections allowunconnected:

host1.ethg++ <–> EthernetInterface <–> router[0].ethg++;

router[0].ethg++ <–> EthernetInterface <–> router[1].ethg++;

router[1].ethg++ <–> EthernetInterface <–> router[2].ethg++;

router[2].ethg++ <–> EthernetInterface <–> host2.ethg++;

}

Explanation:

• StandardHost: denoted end systems (e.g., host1 and host2) that create and receive traffic.
• Router: signify routers that utilize the RIP protocol to forward packets among hosts.
• EthernetInterface: signify wired connections among routers and hosts.
• Ipv4NetworkConfigurator: Automatically allocate an IP addresses to routers and hosts.

4. Configure the Routing Protocol in omnetpp.ini

Next, set up the RIP protocol in the omnetpp.ini file. In this case, we will replicate RIP, that utilize the Bellman-Ford algorithm to estimate the shortest path.

Example omnetpp.ini Configuration for RIP:

network = RoutingProjectNetwork

sim-time-limit = 200s

# IP Address Configuration

*.host1.ipv4.address = “10.0.0.1”

*.host1.ipv4.netmask = “255.255.255.0”

*.host2.ipv4.address = “10.0.0.2”

*.host2.ipv4.netmask = “255.255.255.0”

# Enable RIP (Distance Vector Routing using Bellman-Ford Algorithm)

*.router[*].hasRip = true

*.router[*].ripRouter.routingTable = “RipRoutingTable”

# Traffic Configuration (UDP Traffic Generation)

*.host1.numApps = 1

*.host1.app[0].typename = “UdpBasicApp”

*.host1.app[0].destAddresses = “10.0.0.2”   # Send traffic to Host2

*.host1.app[0].destPort = 5000

*.host1.app[0].messageLength = 1024B

*.host1.app[0].sendInterval = exponential(1s)

*.host2.numApps = 1

*.host2.app[0].typename = “UdpSink”   # Host2 is the UDP receiver

*.host2.app[0].localPort = 5000

# RIP Configuration

*.**.ripRouter.updateInterval = 10s    # Interval for RIP updates

*.**.ripRouter.timeoutInterval = 30s   # Time before a route is declared invalid

*.**.ripRouter.holdDownInterval = 15s  # Hold-down time for unreachable routes

Explanation:

• RIP Configuration: permits the RIP protocol on all routers. RIP calculates the shortest path using the Bellman-Ford algorithm, interchanging routing updates occasionally.
• UDP Traffic Generation: Host1 sends UDP traffic to Host2 across the routers, and Host2 receives the traffic.
• RIP Parameters: Set up the RIP update interval, timeout interval, and hold-down period for managing route failures.

5. Run the Simulation

1. Build the Project:
   • Right-click on OMNeT++ project and select Build Project to compile the simulation files.
2. Run the Simulation:
   • Right-click on omnetpp.ini and select Run As > OMNeT++ Simulation.
   • Utlize the Qtenv graphical interface to track how RIP estimate the shortest paths among routers and how packets are transmitted from Host1 to Host2.

6. Analyse the Results

Once the simulation is complete, we can evaluate numerous contexts of the routing protocol:

1. Routing Table Convergence:
   • Validate how quickly RIP converges and updates routing tables on each router.
2. Traffic Flow:
   • Evaluate the flow of traffic from Host1 to Host2 and validate that RIP properly routes the traffic.
3. RIP Control Traffic:
   • Observe RIP control traffic like Route Updates interchanged among routers.
4. Performance Metrics:
   • End-to-End Delay: Evaluate the time taken for packets to traverse the network.
   • Throughput: Measure the overall data throughput among hosts.
   • Packet Delivery Ratio: Validate if packets are successfully delivered to the destination.

7. Simulate Dynamic Network Conditions

We can simulate numerous dynamic network conditions to track how RIP adapts to changes in the network topology:

1. Link Failures:
   • Replicate a link failure by disabling a connection among routers and track how RIP reroutes traffic.

# Simulate link failure by disabling the connection between router1 and router2

*.router[1].ethg[1].disable = true

1. Congestion:
   • Establish additional traffic flows to replicate network congestion and track how RIP manage multiple traffic streams.
2. Latency and Packet Loss:
   • Establish latency or packet loss on particular links to monitor how RIP act as in unreliable network conditions.

8. Extend the Simulation

1. Test with Larger Topologies:
   • Increase the number of routers and hosts to generate a more complex network and track how the routing protocol scales.
2. Compare with Other Routing Protocols:
   • Replicate other routing protocols like OSPF, AODV, or DSR and relate their performance with RIP based on convergence time, control traffic, and route optimality.
3. Custom Routing Protocol:
   • Execute own custom routing protocol according to theoretical routing approaches designated in TutorialsPoint and replicate it in OMNeT++.

Through this manual, you can explore various characteristics and their mechanisms of the TutorialsPoint projects which will be simulated and evaluated in the OMNeT++ environment. If needed, we will deliver the detailed structured entire execution process in another script.

If you want top-notch results for your Tutorialspoint Routing Projects using the OMNeT++ tool, you can count on our experts for solid simulation support. We also dive into various routing techniques like OSPF, RIP, AODV, or even custom protocols tailored to fit your project requirements.