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How to Implement Network Traffic Shaping in OMNeT++

To implement the network traffic shaping in OMNeT++, we have to control the flow of data in a network to handle bandwidth usage, minimize reduce jamming and make certain that network resources are assigned based on the certain policies. It can be used to prioritize specific kinds of traffic, restrict the bandwidth of certain flows or make certain fair circulation of resources between users.

Follow step-by-step guide to implementing network traffic shaping in OMNeT++:

Step-by-Step Implementation:

  1. Set Up OMNeT++ and INET Framework
  • Make sure that OMNeT++ and the INET framework are installed and correctly configured.
  • Create a new project in OMNeT++ and include the INET framework, which offers the essential modules for network simulations as well as traffic shaping capabilities.
  1. Design the Network Topology
  • In .ned file to design the network topology that has the nodes (e.g., clients, servers, routers) where traffic shaping will be applied.

Example .ned file:

network TrafficShapingNetwork {

submodules:

client1: StandardHost {

@display(“p=100,200”);

}

client2: StandardHost {

@display(“p=100,300”);

}

server: StandardHost {

@display(“p=300,250”);

}

router: Router {

@display(“p=200,250”);

}

connections:

client1.ethg++ <–> Ethernet100M <–> router.pppg++;

client2.ethg++ <–> Ethernet100M <–> router.pppg++;

router.pppg++ <–> Ethernet1G <–> server.ethg++;

}

This network has two clients, a server, and a router. Traffic shaping can be accomplished at the router to control traffic from the clients to the server.

  1. Configure Traffic Generation
  • In the network, execute the modules which produce traffic that will be shaped by traffic shaping policies.

Example of generating TCP and UDP traffic:

*.client1.numApps = 1

*.client1.app[0].typename = “TcpBasicClientApp”

*.client1.app[0].connectAddress = “server”

*.client1.app[0].connectPort = 80

*.client1.app[0].sendInterval = 1s

*.client1.app[0].messageLength = 1000B

*.client2.numApps = 1

*.client2.app[0].typename = “UdpBasicApp”

*.client2.app[0].destAddress = “server”

*.client2.app[0].destPort = 1234

*.client2.app[0].sendInterval = 1s

*.client2.app[0].messageLength = 500B

This development sets up client1 to send TCP traffic and client2 to send UDP traffic to the server.

  1. Implement Traffic Shaping
  • Traffic shaping in OMNeT++ can be executed using different methods like token bucket filters, leaky bucket algorithms, or queue-based mechanisms.

4.1 Using Queue-Based Traffic Shaping

  • One of the modest ways to deploy traffic shaping is by setting up the queuing discipline on the router’s interfaces.

Example of setting up a token bucket filter (TBF) for traffic shaping:

# Apply traffic shaping at the router

*.router.pppg[*].queue.typename = “TokenBucketQueue”

*.router.pppg[*].queue.rate = “10Mbps”  # Set the shaping rate to 10 Mbps

*.router.pppg[*].queue.burstSize = “100kB”  # Set the maximum burst size

*.router.pppg[*].queue.maxQueueLength = 50  # Set the maximum queue length

This configuration sets up a TokenBucketQueue on the router’s interfaces, restricting the traffic to 10 Mbps and controlling the burst size.

4.2 Using Traffic Classifiers and Priority Queues

  • You can also categorize traffic and allocate various priorities to various kinds of traffic, making certain that high-priority traffic gets through more quickly.

Example of configuring a priority queue:

# Apply priority queuing at the router

*.router.pppg[*].queue.typename = “PriorityQueue”

*.router.pppg[*].queue.numQueues = 2  # Two priority levels

*.router.pppg[*].queue.packetClassifier.function = “classifyByTcpUdpPort”

# Assign TCP traffic to high priority (0) and UDP to low priority (1)

*.router.pppg[*].queue.classifier.tcpLowPriority = false

*.router.pppg[*].queue.classifier.udpLowPriority = true

This configuration categorize TCP traffic as high priority and UDP traffic as low priority, ensuring that TCP traffic is processed first.

  1. Run the Simulation
  • Implement the simulation in OMNeT++ to monitor the impacts of the traffic shaping policies. Observe how traffic is controlled, the affect on various kinds of traffic, and if the desired performance goals are met.
  • Visualize traffic flow, queue lengths, and packet delays by using OMNeT++’s built-in tools.
  1. Analyze the Results
  • Assess the affects of traffic shaping on network performance after running the simulation. Key metrics to monitor like throughput, delay, packet loss, and the efficiency of resource usage.
  • Check the records and output files to authenticate that traffic shaping is working as intended, making sure that high-priority traffic receives preferential treatment and that overall bandwidth usage is within the limits set by the shaping policies.
  1. Optimize and Extend
  • Based on the analysis, you can refine the traffic shaping parameters to better meet the desired network performance intent. This might involve fine-tuning the shaping rates, burst sizes, or priority levels.
  • Consider extending the simulation to contain more difficult traffic patterns, various kinds of traffic (like voice, video, bulk data), or changing network conditions (e.g., congestion, link failures).
  • Execute more advanced traffic shaping mechanisms like Weighted Fair Queuing (WFQ), Class-Based Queuing (CBQ), or other QoS mechanisms.

We clearly understand and helped you to learn the implementation and execution of the Network Traffic Shaping in OMNeT++ environment that effectively manages the network resources and traffic while performing by using Queue-Based Traffic Shaping. You can expand them to enhance the network performance.

Choose omnet-manual.com for help with implementing Network Traffic Shaping and discover a range of project ideas in this area. We provide thorough research to assist you in making the most of the OMNeT++ tool.

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