How to Start Wired LANs Projects Using NS3

To start a Wired Local Area Network (LAN) project using NS3, we will need to replicate the network situation, which use the wired connections like Ethernet, among the nodes. Wired LANs are optimal for learning the network behavior within environments in which stability, high throughput, and low latency are need like within office buildings, data centers, or campus networks. NS3 offers the CSMA (Carrier Sense Multiple Access) module, replicating wired LANs. Following is a sequential methodology to configure and replicate the wired LAN projects in NS3.

Steps to Start Wired LANs Projects in NS3

  1. Define Project Objectives and Scope
  • Identify Wired LAN Use Cases:
    • Office Network Simulation: We replicate a wired network of computers associated to switches or routers.
    • Data Center Network: Design high-throughput connections among the servers and switches within a data center.
    • Campus Network: Model a LAN, which associates several departments or buildings along with switches and routers.
  • Determine Key Performance Metrics:
    • Throughput: We estimate the data transfer rates over the wired network.
    • Latency: To measure the delay among transmitting, obtaining packets.
    • Packet Delivery Ratio: Calculate the reliability and packet loss rate that is particularly in high load.
    • Collision Rate: Observe the collision rates, measuring the influence over network performance in scenarios with high traffic.
  1. Install and Set Up NS3
  • Download NS3: Get the new NS3 version from the official NS3 website.
  • Install NS3: Depends on the operating system we can adhere to installation guide, making sure that dependencies are included.
  • Verify Installation: Then, execute the example NS3 scripts, verifying the configuration are properly operating.
  1. Configure LAN Components in NS3
  • CSMA (Ethernet) Module:
    • NS3 offers the CSMA module, replicating the Ethernet-based wired LANs.
    • CSMA (Carrier Sense Multiple Access) manages packet transmission across distributed media by means of identifying whether the line is empty of full.
  • Network Topology:
    • Make nodes, which denote the computers, servers, or networking devices such as switches to utilize NodeContainer.
    • Configure LAN topologies along with diverse layouts like star (central switch or hub), bus (shared media), or ring (closed loop).
  1. Set Up CSMA Channel and Devices
  • Define CSMA Channel Properties:
    • Make CSMA channel including metrics like DataRate and Delay to utilize CsmaHelper.
    • DataRate replicates the link speed such as 100 Mbps, 1 Gbps.
    • Delay denotes the propagation delay in the wired LAN that normally contain a small value such as 1-2 microseconds.
  • Install CSMA Devices on Nodes:
    • We install the CSMA devices on each node using the CsmaHelper, to allow them interacting across the CSMA channel.
  1. Set Up IP Addressing and Internet Stack
  • Internet Stack:
    • Install the TCP/IP protocol stack on each node that permits network-layer interaction using InternetStackHelper.
    • Use Ipv4AddressHelper, allocate the IP addresses to each device that manages IP address assignment automatically in the LAN.
  1. Configure Applications and Traffic Patterns
  • Traffic Generators:
    • Replicate teh continuous or bursty traffic flows to denote normal network behavior such as web browsing, file sharing, or database queries to utilize OnOffApplication.
    • Utilize UdpEcho for request-response experimenting which is same to ping for simpler traffic.
  • Packet Sinks:
    • Seize incoming packets to permit the measurement of throughput, packet loss, and delay to utilizing PacketSink on receiving nodes.
  1. Define and Measure Performance Metrics
  • Throughput and Latency:
    • Compute throughput by means of monitoring the volume of data transmitted and received. We estimate the latency by way of logging the timestamps on packets.
  • Collision Detection:
    • We need to observe the collision statistics that particularly under high-traffic situations like CSMA will submit the transmission as the line is full of activity.
  1. Simulate and Analyze Results
  • Run Simulations:
    • Experiment in different conditions like diverse volumes of nodes, traffic rates, and delays, examining the performance of LAN.
  • Data Collection:
    • Record the performance data using NS3’s tracing tools like AsciiTrace, PcapTrace for future analysis.
  • Analyze Results:
    • Examine throughput, delay, and collision rate trends to utilize visualization tools such as Matplotlib or Gnuplot.

Example Code Outline for a Basic Wired LAN in NS3

Following is a simple NS3 code outline to configure a wired LAN including one central switch and numerous connected nodes.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/csma-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

int main(int argc, char *argv[]) {

// Step 1: Create Nodes

NodeContainer nodes;

nodes.Create(6); // Six nodes (e.g., office computers or data center servers)

// Step 2: Configure CSMA Channel and Devices

CsmaHelper csma;

csma.SetChannelAttribute(“DataRate”, StringValue(“100Mbps”));

csma.SetChannelAttribute(“Delay”, TimeValue(NanoSeconds(6560)));

NetDeviceContainer devices = csma.Install(nodes);

// Step 3: Install Internet Stack and Assign IP Addresses

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

// Step 4: Set Up Applications

UdpEchoServerHelper echoServer(9); // Set up a simple echo server on one node

ApplicationContainer serverApp = echoServer.Install(nodes.Get(0)); // First node is the server

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

UdpEcheClientHelper echoClient(interfaces.GetAddress(0), 9); // Client application sending to server

echoClient.SetAttribute(“MaxPackets”, UintegerValue(20));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(0.5))); // 2 packets per second

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

ApplicationContainer clientApps = echoClient.Install(nodes.Get(1)); // Install client on another node

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

// Step 5: Run Simulation

Simulator::Run();

Simulator::Destroy();

return 0;

}

Through this guide, we indicated how to set up and replicate the Wired LANs Projects using above simulation process within NS2 environment. If you want any more details about this topic, we will be added later.

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