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How to Implement global routing in OMNeT++

Global routing in OMNeT++ states that to setup where routing decisions made based on a global view of the network, usually using a central controller or a precomputed routing table that is stable across all nodes. This method is different from dynamic, decentralized routing protocols like OSPF or BGP, where routing decisions are prepared locally based on swap over information.

To implement the global routing in OMNeT++, we can use INET’s built-in support for static routing or physically set up the routing tables across the network nodes to replicate a globally consistent routing policy. We have all the resources to carry on your work perfectly drop us a message to guide you more.

Given below steps is help to implement global routing in OMNeT++ using the INET framework.

Step-by-Step Implementations:

Step 1: Set Up OMNeT++ and INET Framework

  1. Install OMNeT++:
    • Make sure OMNeT++ is installed on the system. Download it from the OMNeT++
  2. Install the INET Framework:
    • Download and install the INET Framework, which presents different networking protocols and models, including support for static routing. INET can be downloaded from the INET GitHub repository.

Step 2: Create a New OMNeT++ Project

  1. Create the Project:
    • Open OMNeT++ and make a new OMNeT++ project through File > New > OMNeT++ Project.
    • Name the project like GlobalRoutingSimulation and set up the project directory.
  2. Set Up Project Dependencies:
    • Make certain the project references the INET Framework by right-clicking on the project in the Project Explorer, directing to Properties > Project References, and verifying the INET project.

Step 3: Define the Network Topology

  1. Create a NED File:
    • Describe the network topology using the NED language. This topology will consist of routers and hosts that will use global (static) routing.

Example:

network GlobalRoutingNetwork

{

submodules:

router1: Router {

@display(“p=100,200”);

}

router2: Router {

@display(“p=300,200”);

}

router3: Router {

@display(“p=200,300”);

}

host1: StandardHost {

@display(“p=50,350”);

}

host2: StandardHost {

@display(“p=350,350”);

}

connections allowunconnected:

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

router2.ethg++ <–> Eth10Mbps <–> router3.ethg++;

router3.ethg++ <–> Eth10Mbps <–> router1.ethg++;

router1.ethg++ <–> Eth10Mbps <–> host1.ethg++;

router3.ethg++ <–> Eth10Mbps <–> host2.ethg++;

}

  1. Configure Network Parameters:
    • Set up essential link parameters like bandwidth, delay, and packet loss to simulate a realistic network setting.

Step 4: Configure Global Routing

  1. Use INET’s Static Routing Configuration:
    • INET permits to configure static routes in the omnetpp.ini file or over NED files. This configuration is efficiently a form of global routing because we physically set up the routing paths across the whole network.
  2. Configure Static Routes in omnetpp.ini:

Example:

[General]

network = GlobalRoutingNetwork

sim-time-limit = 100s

**.scalar-recording = true

**.vector-recording = true

# Define static routing tables

*.router1.ipv4.routingTable.routes = “host2 10.0.0.2 255.255.255.255 10.0.0.2 1”

*.router2.ipv4.routingTable.routes = “host2 10.0.0.2 255.255.255.255 10.0.0.3 1; host1 10.0.0.1 255.255.255.255 10.0.0.1 1”

*.router3.ipv4.routingTable.routes = “host1 10.0.0.1 255.255.255.255 10.0.0.1 1”

# Host configurations

*.host1.numApps = 1

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

*.host1.app[0].destAddress = “host2”

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

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

*.host1.app[0].sendInterval = uniform(1s, 2s)

*.host2.numApps = 1

*.host2.app[0].typename = “UdpBasicApp”

*.host2.app[0].destAddress = “host1”

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

*.host2.app[0].messageLength = 1024B

*.host2.app[0].sendInterval = uniform(1s, 2s)

    • Static Routes: The routes parameter in omnetpp.ini denotes the static routes for each router. Each route entry embraces the destination, gateway, net mask, interface, and metric.
  2. Optionally Configure Static Routes in the NED File:
    • We can also configure static routes directly in the NED file by giving the routing table entries for each router.

Example:

router1: Router {

@display(“p=100,200”);

ipv4.routingTable.routes = “host2 10.0.0.2 255.255.255.255 10.0.0.2 1”;

}

Step 5: Set Up the Simulation

  1. Configure the Simulation in omnetpp.ini:
    • Set up the simulation parameters, like simulation time, network settings, and traffic patterns as exposed in the model above.
  2. Traffic Configuration:
    • Configure the traffic patterns, like UDP or TCP applications running on the hosts, to generate network activity and trigger routing.

Step 6: Run the Simulation

  1. Compile the Project:
    • Make sure everything is correctly implemented and compiled.
  2. Run Simulations:
    • Execute the simulations using OMNeT++’s IDE or command line. Notice how the static (global) routing protocol directs packets across the network according to the configured routes.

Step 7: Analyze the Results

  1. Monitor Global Routing Behavior:
    • Evaluate how packets are routed according to the static routes we configured. Check all routers are following the global routing configuration.
  2. Evaluate Performance:
    • Evaluate key performance metrics like packet delivery ratio, end-to-end delay, and the effectiveness of the routing paths.
    • Scalars and Vectors: Use OMNeT++ tools to record and explore scalar and vector data, like the number of packets sent, received, and dropped, along with the time taken to deliver packets.
  3. Check for Issues:
    • Regard for issues like routing loops or suboptimal routes that may display problems with the static routing configuration.

Step 8: Refine and Optimize the Configuration

  1. Address Any Issues:
    • Adjust static routes or network configuration based on the simulation results to optimize performance.
  2. Re-Test:
    • Run the simulation again with the enhanced configuration to validate improvements.

Finally, we had achieve how to execute the Global routing using INET framework and NED language in OMNeT++. Further insights will be offered in line with your desires.