How to Implement Wired LANs in ns2

To implement wired LANs (Local Area Networks) in ns2 has encompasses to generate a network in which the multiple wired nodes interacts with each other using a physical medium, like Ethernet. In this setting, we can replicate the communication among the devices such as computers, servers, and switches in a typical office or data centre environment. Get your network performance done from ns2project.com developers we provide you with best thesis ideas and topics.

The following is a brief procedure to implement the Wired LAN scenario in NS2:

Step-by-Step Implementation:

  1. Understand Wired LAN Components:
  • Wired Nodes: Devices like computers, servers, or printers that are associated through Ethernet cables.
  • Switches or Hubs: Network devices that interconnect multiple wired nodes, managing the data flow among them.
  • Ethernet Protocol (IEEE 802.3): The standard protocol used for wired communication in LANs.
  1. Set Up the NS2 Environment:
  • Make sure NS2 is installed on system.
  • Understand yourself with writing TCL scripts, as NS2 simulations are controlled across TCL.
  1. Define the Network Topology:
  • Generate nodes that denote wired devices and set up connections among them using switches.

# Define the simulator

set ns [new Simulator]

# Create a trace file for analysis

set tracefile [open out.tr w]

$ns trace-all $tracefile

# Create a NAM file for animation

set namfile [open out.nam w]

$ns namtrace-all-wireless $namfile 10

# Set up the network parameters

set opt(chan)   Channel/WiredChannel;# Wired channel for LAN

set opt(prop)   Propagation/ConstantSpeed ;# Propagation model for wired

set opt(netif)  Phy/WiredPhy;# Network interface type for wired

set opt(mac) Mac/802_3  ;# MAC type for Ethernet

set opt(ifq)  Queue/DropTail/PriQueue;# Interface queue type

set opt(ll) LL  ;# Link layer type

set opt(ifqlen) 50;# Queue size

set opt(delay)  10ms ;# Link delay for wired network

# Create a topography object

create-god 10

# Configure the nodes (e.g., wired devices)

$ns node-config -llType $opt(ll) \

-macType $opt(mac) \

-ifqType $opt(ifq) \

-ifqLen $opt(ifqlen) \

-propType $opt(prop) \

-phyType $opt(netif) \

-channelType $opt(chan) \

-topoInstance $topo \

-agentTrace ON \

-routerTrace ON \

-macTrace OFF \

-movementTrace OFF

# Create wired nodes

set node1 [$ns node]  ;# Wired Node 1

set node2 [$ns node]  ;# Wired Node 2

set node3 [$ns node]  ;# Wired Node 3

# Create a Switch (if needed, otherwise connect nodes directly)

set switch1 [$ns node] ;# Network switch

# Set initial positions for the nodes (optional for wired networks)

$node1 set X_ 100.0

$node1 set Y_ 100.0

$node1 set Z_ 0.0

$node2 set X_ 200.0

$node2 set Y_ 100.0

$node2 set Z_ 0.0

$node3 set X_ 300.0

$node3 set Y_ 100.0

$node3 set Z_ 0.0

$switch1 set X_ 150.0

$switch1 set Y_ 150.0

$switch1 set Z_ 0.0

  1. Implement Wired LAN Communication:
  • Configure the wired connections among the nodes and the switch.

# Create duplex links between nodes and switch with defined bandwidth and delay

$ns duplex-link $node1 $switch1 100Mb 10ms DropTail

$ns duplex-link $node2 $switch1 100Mb 10ms DropTail

$ns duplex-link $node3 $switch1 100Mb 10ms DropTail

# Example of sending data from Node 1 to Node 2 via Switch

set tcp_node1 [new Agent/TCP]

$ns attach-agent $node1 $tcp_node1

set tcp_node2_sink [new Agent/TCPSink]

$ns attach-agent $node2 $tcp_node2_sink

$ns connect $tcp_node1 $tcp_node2_sink

# Start sending data from Node 1 to Node 2

set app_node1 [new Application/FTP]

$app_node1 attach-agent $tcp_node1

$ns at 2.0 “$app_node1 start”

  1. Run the Simulation:
  • Describe when the simulation should terminate and executed it. The finish procedure will close the trace files and open the NAM for visualization.

# Define the finish procedure

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exec nam out.nam &

exit 0

}

# Schedule the finish procedure at 10 seconds

$ns at 10.0 “finish”

# Run the simulation

$ns run

  1. Analyse the Results:
  • Use the trace file (out.tr) to evaluate data transmission, packet delays, and overall network performance.
  • Open the NAM file (out.nam) to visualize the network operations and track the communication among wired nodes and the switch.
  1. Customize and Extend:
  • Customize the simulation by:
    • Attaching more nodes and switches to emulate a larger LAN environment.
    • Executing advanced features such as VLANs, Quality of Service (QoS) management, or security mechanisms like MAC filtering.
    • To replicate diverse scenarios, like changing traffic loads, link failures, or changes in network topology.

Example Summary:

This sample configures a simple Wired LAN simulation in NS2 that concentrates on communication among the wired nodes using the Ethernet protocol (IEEE 802.3). The simulation will show how devices in a LAN interact via a switch, exchanging data over a wired medium.

Advanced Considerations:

  • For more complex scenarios, to deliberately incorporate the NS2 with specialized tools for network simulation or developing custom modules to emulate the advanced LAN technologies, like Spanning Tree Protocol (STP) for loop mitigation or Link Aggregation for enhanced bandwidth.
  • Expand the simulation to contain advanced features such as dynamic routing protocols, multi-path routing, or network congestion control.

Debugging and Optimization:

  • Use the trace-all command to debug the simulation and evaluate on how wired communication impacts packet flows and network performance.
  • Enhance the simulation by decontaminating the network parameters, that modifies the link delays, and tuning communication protocols for better performance and efficiency.

In the conclusion, we had help walk you to implement the wired LANs in ns2 simulator that interacts with each other wired node. More information about wired LANs will be shared according to your needs.