To simulate Global Routing using OMNeT++, which encompasses setting up routing tables thus that the whole network uses a global method for routing packets. The simulation tool OMNeT++ and its INET framework provide built-in support for routing protocols and manual routing table configurations, that permitting for global routing simulations. The following is a simple approach how we can configure a project to replicate global routing:
Steps to Simulate Global Routing Projects in OMNeT++
- Set Up OMNeT++ and INET
- Download OMNeT++: Install the OMNeT++ simulation environment from here.
- Install INET Framework: The INET framework is an extension of OMNeT++, which offers prebuilt network protocols that containing routing capabilities. Download it from the INET GitHub page, or utilize OMNeT++’s built-in package manager to install INET.
- Understand Global Routing in OMNeT++
Global routing in OMNeT++ typically refers to routing where:
- All nodes within the network are alert of the network topology.
- Routes are calculated globally, meaning for each router has a comprehensive view of the network.
- INET framework delivers Global Routing for IP networks utilizing static routing tables or using protocols, which calculate routes according to the network topology.
- Create a New OMNeT++ Project
- Make a new OMNeT++ project in the IDE.
- Link the INET framework to the project thus we can utilize its routing aspects.
- Define Network Topology (NED File)
Here we must make a network topology within a NED (Network Description) file. This file describes the structure of the network that encompassing routers, hosts, and the links among them.
Example NED file for a global routing simulation with multiple routers:
network GlobalRoutingNetwork
{
parameters:
@display(“bgb=800,600”);
submodules:
routerA: Router {
@display(“i=abstract/router”);
}
routerB: Router {
@display(“i=abstract/router”);
}
routerC: Router {
@display(“i=abstract/router”);
}
hostA: StandardHost {
@display(“i=device/pc”);
}
hostB: StandardHost {
@display(“i=device/pc”);
}
connections:
routerA.pppg++ <–> PointToPointLink <–> routerB.pppg++;
routerB.pppg++ <–> PointToPointLink <–> routerC.pppg++;
hostA.ethg++ <–> EthernetLink <–> routerA.ethg++;
hostB.ethg++ <–> EthernetLink <–> routerC.ethg++;
}
- Enable Global Routing in INET
INET delivers an automatic global routing aspects in which it computes routes across the whole network. We require to allow this aspects in the configuration file (omnetpp.ini).
Example omnetpp.ini file configuration for global routing:
[General]
network = GlobalRoutingNetwork
sim-time-limit = 100s
# Enable global routing in INET
*.routerA.hasGlobalRoute = true
*.routerB.hasGlobalRoute = true
*.routerC.hasGlobalRoute = true
# Enable automatic global routing for IPv4
*.routerA.ipv4.routing.globalRoute = true
*.routerB.ipv4.routing.globalRoute = true
*.routerC.ipv4.routing.globalRoute = true
# IP addresses for routers and hosts
*.routerA.networkLayer.configurator.address = “192.168.1.1”
*.routerB.networkLayer.configurator.address = “192.168.2.1”
*.routerC.networkLayer.configurator.address = “192.168.3.1”
*.hostA.networkLayer.configurator.address = “192.168.1.2”
*.hostB.networkLayer.configurator.address = “192.168.3.2”
Key points:
- hasGlobalRoute: This allows global routing for the routers.
- ipv4.routing.globalRoute: INET calculates global routes for the IP layer.
- We can allocate an IP addresses to the routers and hosts to make certain that appropriate routing behaviour.
- Set Up Static Routing (Optional)
If we need to execute the global routing manually then we can set up static routes. It provides more control over routing behaviour.
Example static routing configuration in the .ini file:
*.routerA.routingTable.staticRoutes = (
{ destination = “192.168.2.0”, netmask = “255.255.255.0”, gateway = “192.168.2.1” },
{ destination = “192.168.3.0”, netmask = “255.255.255.0”, gateway = “192.168.2.1” }
)
*.routerB.routingTable.staticRoutes = (
{ destination = “192.168.1.0”, netmask = “255.255.255.0”, gateway = “192.168.1.1” },
{ destination = “192.168.3.0”, netmask = “255.255.255.0”, gateway = “192.168.3.1” }
)
- Run the Simulation
we can run the simulation after configuring the topology and allowing global routing . OMNeT++ permits to monitor packet flows, routing decisions, and network performance.
Utilize OMNeT++’s Qtenv or Tkenv environments to observe the real-time behaviour of the network.
- Analyze Simulation Results
After running the simulation, we can:
- Check Routing Tables: Check that global routing has properly calculate paths among all routers. We can verify routing tables in each router.
- Observe Packet Flows: Observe how packets are routed from origin to destination according to the global routing information.
- Simulate Network Events: We can launch network changes like link failures, to monitor how the global routing protocol adjusts.
- Extend the Project
Here are some ways to prolong the global routing simulation:
- Larger Network Topologies: Maximize the amount of routers and hosts to make more complex topologies.
- Network Failures: Launch link or node failures to monitor how global routing protocols response and recalculate routes.
- QoS Routing: We can change the global routing process to deliberate Quality of Service (QoS) factors, like link bandwidth and latency.
- Metrics and Performance Analysis
Global routing simulations can offer insight into:
- Route Convergence Time: Estimate how quickly routing tables are updated after topology changes.
- Network Throughput: Investigate the overall throughput rely on the routing decisions.
- Packet Delivery: Verify how effectively packets are routed over the network, particularly in larger topologies or under network stress.
Example Project Structure
GlobalRoutingSimulation/
├── src/
│ └── GlobalRoutingNetwork.ned # Network topology
├── omnetpp.ini # Simulation configuration
└── Makefile # Build file
By following these steps, we should be able to replicate global routing within OMNeT++ using either automatic global routing or static route configuration.
We indicated the general approach with sample coding for Global Routing Projects, simulated and calculated its performance metrics in OMNeT++ platform. Additional details will follow in upcoming manual. Send us all your reasech details we will help you with best simulation guidance.
