How to Implement Point to Point Topology in NS2

To implement the Point-to-Point Topology in NS2 has needs to mimic the simple network topology in which the nodes are directly associated by a single communication link. In this topology, data is routed among the two nodes without the involvement of any intermediate node. To executing a point-to-point connection in NS2 is straightforward and it is common the basis for more complex topologies. The given below is the brief procedure to implement the point to point topology in ns2:

Steps to Implement Point-to-Point Topology in NS2:

  1. Set Up the Network Topology:
    • Describe two nodes that will signify the endpoints of the point-to-point link.
    • Generate a duplex link among the two nodes to mimic a bidirectional connection.
  2. Simulate Traffic Flow:
    • Traffic can be created from one node to the other using agents such as TCP or UDP, and applications such as FTP or CBR.

Example of Point-to-Point Topology Implementation in NS2:

Below is an instance script that demonstrates how to configure a point-to-point topology with traffic simulation among the two nodes:

# Create a new simulator

set ns [new Simulator]

# Open trace file for output

set tracefile [open out.tr w]

$ns trace-all $tracefile

# Define two nodes in the point-to-point topology

set n0 [$ns node]  ;# Node 0

set n1 [$ns node]  ;# Node 1

# Create a duplex link between the two nodes

$ns duplex-link $n0 $n1 1Mb 10ms DropTail  ;# Link with 1Mb bandwidth, 10ms delay, and DropTail queue

# Define TCP agents for traffic between the two nodes

set tcp0 [new Agent/TCP]

set sink0 [new Agent/TCPSink]

$ns attach-agent $n0 $tcp0

$ns attach-agent $n1 $sink0

$ns connect $tcp0 $sink0

# Simulate FTP traffic from node 0 to node 1

set ftp0 [new Application/FTP]

$ftp0 attach-agent $tcp0

$ns at 1.0 “$ftp0 start”   ;# Start FTP traffic at 1.0 seconds

# End the simulation after 10 seconds

$ns at 10.0 “finish”

proc finish {} {

global ns tracefile

$ns flush-trace

close $tracefile

exit 0

}

# Run the simulation

$ns run

Explanation of the Script:

  1. Nodes:
    • n0 and n1 signify the two nodes connected in the point-to-point topology.
  2. Link:
    • A duplex link is generated among n0 and n1. This link has a bandwidth of 1Mb, a propagation delay of 10ms, and uses a DropTail queue for packet handling.
  3. Traffic Simulation:
    • TCP agents are used to mimic interaction among the two nodes. n0 acts as the sender, and n1 acts as the receiver.
    • FTP (File Transfer Protocol) is used to create traffic from node n0 to node n1, simulating a file transfer.
    • The FTP application initiates at 1.0 seconds in the simulation.
  4. Simulation Duration:
    • The simulation executes for 10 seconds, after that it stops, permits time for data transfer among the two nodes.

Post-Simulation Analysis:

  1. Trace File Analysis:
    • Open the trace file (out.tr) to evaluate the packet flow among n0 and n1. We can observe performance metrics such as packet delivery, delay, and throughput for the point-to-point communication.
  2. NAM Visualization:
    • Use NAM (Network Animator) to visualize the point-to-point connection. We will see the two nodes associated by a single link, and we can monitor on how data flows from one node to the other.
  3. Performance Metrics:
    • Evaluate network parameters like delay, throughput, and packet loss to evaluate on how well the point-to-point connection manages the traffic.

Enhancing the Simulation:

  1. Changing Traffic Type:
    • We can replace TCP with UDP or use CBR (Constant Bit Rate) rather than FTP to mimic diverse kinds of traffic and evaluate on how the network performs.
  2. Varying Link Parameters:
    • Validate with numerous link parameters like bandwidth, delay, and queue type (e.g., DropTail or RED) to learn on how the network performance changes in numerous conditions.
  3. Simulating Larger Data Transfers:
    • Upsurge the size of the FTP transfer or the traffic rate for more intense simulations. We can also evaluate the effect of network congestion by modifying the queue sizes.
  4. Simulating Traffic in Both Directions:
    • Configure traffic in the reverse direction (from n1 to n0) to mimic bidirectional communication.

This technique will help you to understand how to setup the simulation and how to execute the point to point topology in ns2 tool and also we deliver the explanation, post analysis simulation was given. If you need more details about the point to point topology we will provide it.

For implementing Point to Point Topology, ns2project.com is your go-to resource, offering the latest insights and topics. Our developers conduct network performance analysis for your projects, and we also tackle more intricate topologies to meet your needs.