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How to Implement Network QoS Attainment in OMNeT++

To implement Network Quality of Service (QoS) attainment in OMNeT++  has includes to setup the network to priority the particular kinds of traffic, make sure the  minimum bandwidth for specific flows, decrease latency, and handle packet loss. This process is usually includes to configure the QoS-aware routing protocols, traffic shaping, and resource allocation mechanisms.  The given below is the structure procedure on how to execute the Network QoS attainment in OMNeT++ with examples.

Step-by-Step Implementation:

  1. Set Up OMNeT++ Environment:
  • Install OMNeT++: Make sure OMNeT++ is installed and properly configured on computer.
  • Install INET Framework: Download and set up the INET framework that deleivers the essential models for networking that contains the QoS mechanisms.
  1. Define the Network Topology:

Initiate by generating a simple network topology where we can execute and validate QoS policies.

Example NED File (QoSNetwork.ned):

package mynetwork;

import inet.node.inet.Router;

import inet.node.inet.StandardHost;

network QoSNetwork

{

submodules:

host1: StandardHost {

@display(“p=100,200”);

}

host2: StandardHost {

@display(“p=300,200”);

}

host3: StandardHost {

@display(“p=100,300”);

}

host4: StandardHost {

@display(“p=300,300”);

}

router1: Router {

@display(“p=200,250”);

}

connections allowunconnected:

host1.pppg++ <–> ethernetLine <–> router1.pppg++;

host2.pppg++ <–> ethernetLine <–> router1.pppg++;

host3.pppg++ <–> ethernetLine <–> router1.pppg++;

host4.pppg++ <–> ethernetLine <–> router1.pppg++;

}

This network consists of four hosts connected to a single router. We will implement QoS policies to handle traffic among these hosts.

  1. Configure QoS Policies:

To achieve QoS, we need to setup the router to manage traffic based on to QoS policies. These policies can encompass the prioritization, bandwidth allocation, and traffic shaping.

Example Configuration in omnetpp.ini:

network = QoSNetwork

**.host1.numApps = 1

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

**.host1.app[0].destAddresses = “host2”

**.host1.app[0].destPort = 1000

**.host1.app[0].messageLength = 1000B

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

**.host3.numApps = 1

**.host3.app[0].typename = “UdpBasicApp”

**.host3.app[0].destAddresses = “host4”

**.host3.app[0].destPort = 2000

**.host3.app[0].messageLength = 1000B

**.host3.app[0].sendInterval = exponential(1s)

**.router1.queue.numQueues = 2

**.router1.queue.packetCapacity = -1

**.router1.queue.classifierModule = “inet.queueing.classifier.PacketClassifier”

**.router1.queue.classifier.defaultGateIndex = 1

**.router1.queue.classifier.packetFilters = “inet.queueing.filter.PacketFilter”

**.router1.queue.classifier.packetFilters[0].pattern = “UDP && udp.destPort == 1000”

In this configuration:

  • Queueing and Classification: The router has two queues, and packets are identified based on their destination port. Traffic destined for port 1000 is treated with higher priority.
  • Traffic Generation: host1 and host3 create UDP traffic towards host2 and host4, accordingly.
  1. Implement Traffic Shaping and Policing:

We can add traffic shaping or policing mechanisms to regulate the flow rate of traffic, that make sure QoS requirements are met.

Example NED File with Traffic Shaping (TrafficShapingRouter.ned):

package mynetwork;

import inet.node.inet.Router;

import inet.node.inet.StandardHost;

import inet.queueing.shaper.TokenBucketShaper;

network QoSNetwork

{

submodules:

host1: StandardHost {

@display(“p=100,200”);

}

host2: StandardHost {

@display(“p=300,200”);

}

router1: Router {

@display(“p=200,250”);

queue: <TokenBucketShaper> {

tokenRate = 1Mbps;

bucketSize = 10MB;

}

}

connections allowunconnected:

host1.pppg++ <–> ethernetLine <–> router1.pppg++;

router1.pppg++ <–> ethernetLine <–> host2.pppg++;

}

Here, TokenBucketShaper is used to regulator the flow of traffic via the router by applying a token bucket rate-limiting mechanism.

  1. Simulate and Monitor QoS Metrics:

Run the simulation and use OMNeT++’s built-in tools to monitor and asses the QoS parameter such as latency, jitter, and packet loss. We can use vector and scalar recording to observe these metrics over time.

Example omnetpp.ini for Recording QoS Metrics:

network = QoSNetwork

# Enable recording of packet delay, jitter, and loss

**.host2.app[0].packetDelay.record = true

**.host2.app[0].packetJitter.record = true

**.host2.app[0].packetLoss.record = true

Example Visualization and Analysis:

  • Packet Delay: Evaluate the end-to-end delay of packets to make sure that high-priority traffic meets the essential latency bounds.
  • Jitter: Extent the variability in packet delay to assess the smoothness of the traffic flow.
  • Packet Loss: Observe packet loss rates to make certain that the network is not dropping critical traffic.
  1. Evaluate and Optimize QoS Policies:

Based on the simulation outcomes, we can measure whether QoS policies are achieving the desired results. We might need to regulate parameters such as queue sizes, bandwidth allocation, or traffic shaping rates to enhance the performance.

  1. Implement Advanced QoS Mechanisms:

For more sophisticated QoS scenarios, we can implement:

  • Differentiated Services (DiffServ): Identify and handle network traffic by allocating various levels of service to packets.
  • Integrated Services (IntServ): Reserve resources along the complete path of the packet flow to guarantee QoS.
  • Weighted Fair Queuing (WFQ): Allocate bandwidth proportionally between numerous traffic classes.

Example of Differentiated Services Implementation:

package mynetwork;

import inet.node.inet.Router;

import inet.node.inet.StandardHost;

import inet.queueing.qos.DscpMarker;

import inet.queueing.qos.PacketFilter;

network DiffServQoSNetwork

{

submodules:

host1: StandardHost {

@display(“p=100,200”);

}

host2: StandardHost {

@display(“p=300,200”);

}

router1: Router {

@display(“p=200,250”);

queue: <WFQ> {

packetFilters = “inet.queueing.filter.PacketFilter”

packetFilters[0].pattern = “dscp == 32”

}

marker: <DscpMarker> {

dscpValue = 32;

}

}

connections allowunconnected:

host1.pppg++ <–> ethernetLine <–> router1.pppg++;

router1.pppg++ <–> ethernetLine <–> host2.pppg++;

}

  1. Document and Report Results:

After running the simulations, document the performance of network under numerous QoS policies. Compare the performance metrics and determine the best QoS configuration for network.

In the entire simulation will demonstrate how to execute and validate the performance over the network for QoS attainment using the OMNeT++ tool. We will deliver a comprehensive overview of the QoS attainment as simulated in various simulations.

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