How to Begin Implement a Wired LANs in NS3

To begin executing a Wired Local Area Network (LAN) utilising ns3 which requires making a nodes network that are associated by wired links for replicating normal LAN behaviors such as data exchange, packet routing, and traffic analysis. Here’s a general method on how to get started:

Steps to Begin Implement a Wired LANs in NS3

1. Set Up ns3 Environment

1. Install ns3:
   • We should download and install ns3 on the system.
   • Make sure that we have set up by executing./waf –run hello-simulator.
2. Include Required Modules:
   • Verify the necessary modules such as point-to-point, internet, and applications components are included for wired LAN simulation.

2. Define Objectives

Focus on project’s goals of wired LANs simulation:

• Replicate the data exchange between nodes.
• Examine network performance parameters such as throughput, latency.
• Experiment application-level traffic.

3. Set Up the LAN Topology

1. Create Nodes:
   • Make nodes to denote the computers or devices to leverage NodeContainer within the LAN.

NodeContainer nodes;

nodes.Create(5); // Example: 5 nodes in the LAN

1. Configure Wired Links:
   • Replicate the wired links among nodes with PointToPointHelper.

PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, StringValue(“1Gbps”));

p2p.SetChannelAttribute(“Delay”, StringValue(“2ms”));

1. Install Devices:
   • Associate nodes using point-to-point devices.

NetDeviceContainer devices;

for (uint32_t i = 0; i < nodes.GetN() – 1; ++i) {

devices.Add(p2p.Install(nodes.Get(i), nodes.Get(i + 1)));

}

1. Assign IP Addresses:
   • Set up the network stack and allocate the IP addresses.

InternetStackHelper internet;

internet.Install(nodes);

Ipv4AddressHelper ipv4;

ipv4.SetBase(“10.1.1.0”, “255.255.255.0”);

ipv4.Assign(devices);

4. Install Applications

1. Simulate Traffic:
   • Install applications such as UDP or TCP traffic generators for simulation.

Example (UDP Echo Application):

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(nodes.Get(4));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(Ipv4Address(“10.1.1.5”), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(100));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(0.1))); // Send every 100 ms

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(nodes.Get(0));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

1. Custom Applications:
   • Improve custom applications for certain behaviors.

class LanApp : public Application {

public:

void StartApplication() override {

// Logic for data exchange

}

};

5. Simulate and Analyze

1. Run the Simulation:
   • Compile and run the simulation utilising./waf.
   • Example: ./waf –run “scratch/wired-lan”
2. Monitor Traffic:
   • Make use of FlowMonitor for accumulating performance parameters.

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll();

1. Analyze Results:
   • Record key events and packet-level statistics for analysis.

6. Visualize the Network

1. NetAnim:
   • Apply AnimationInterface for envisioning the LAN topology and packet flows in NetAnim tools.

AnimationInterface anim(“wired-lan.xml”);

1. Graphical Tools:
   • Transfer the outcomes into external tools such as Python, MATLAB for visualization.

7. Enhance and Optimize

1. Switches or Hubs:
   • Mimic switches or hubs, in a star topology to associate every node.
2. QoS and Traffic Control:
   • Leverage advanced QoS and traffic control approaches for prioritization.

TrafficControlHelper tch;

tch.SetRootQueueDisc(“ns3::FifoQueueDisc”);

1. Dynamic Traffic:
   • Diverse traffic models for analysing the behaviour of network in various loads.

Example Use Cases

• Office LAN Simulation: Experiment data transfer and resource sharing within a wired office LANs network.
• Data Center Simulation: Replicate high-speed and low-latency wired networks.
• LAN Performance Testing: Estimate the performance metrics such as latency, throughput, and packet delivery under diverse scenarios.

These projects offer a simple Wired LANs implementation process, which can be executed and analysed by using NS3. If you want additional assistance or customizations, we will be presented in upcoming manual.