Overview

This project simulates network data transmission using the Stop-and-Wait protocol with acknowledgment packets. It includes:

1. Theoretical Calculator: Computes the time required to send a file under ideal conditions.
2. UDP File Transfer Tools: Sends files over a network using UDP and logs transmission details.
3. Experimentation Framework: Measures and compares theoretical vs. actual transmission times.

Features

• Command-line interface for both theoretical calculations and actual file transmission.
• Logs packet transmission details, acknowledgments, and final results.
• Javadoc documentation for all classes and methods.
• Test cases for robust verification.

Requirements

• Java Development Kit (JDK) version 8 or higher.
• Two computers on the same network for experimentation.
• Tools:
  • iperf for bandwidth measurement.
  • Wireshark for packet analysis.

---

Theoretical Calculator: SendingWithAcksJava.jar

Usage

Run the calculator with the following parameters:

java -jar SendingWithAcksJava.jar -filesize=<size> -packetsize=<size> -acksize=<size> -bandwidth=<bandwidth> -rtt=<time>

Parameters

Parameter	Description	Example
filesize	Total file size to send (B, KB, MB, GB)	40B, 10MB
packetsize	Size of the data packet (B, KB)	10B, 1KB
acksize	Size of the ACK packet (B)	10B
bandwidth	Bandwidth of the connection (mbps, gbps)	100mbps
rtt	Round trip time between sender and receiver (ms)	50ms

Example

java -jar SendingWithAcksJava.jar -filesize=40B -packetsize=10B -acksize=10B -bandwidth=100mbps -rtt=52ms
Output: 0.208006 s

---

UDP File Transfer: UdpStopWaitClient.jar and UdpStopWaitServer.jar

Sending Tool: UdpStopWaitClient.jar

Usage

java -jar UdpStopWaitClient.jar -dest=<IP> -port=<port> -f=<file> -packetsize=<size>

Parameters

Parameter	Description	Example
dest	IP address of the receiving tool	127.0.0.1
port	Port the receiving tool is listening on	5000
f	Path to the file to be sent	file.txt
packetsize	Size of each data packet in bytes	150

Example

java -jar UdpStopWaitClient.jar -dest=127.0.0.1 -port=5000 -f=test.txt -packetsize=150

---

Receiving Tool: UdpStopWaitServer.jar

Usage

java -jar UdpStopWaitServer.jar -ip=<IP> -port=<port> -outfile=<file>

Parameters

Parameter	Description	Example
ip	IP address to listen on	0.0.0.0
port	Port to listen on	5000
outfile	Path to the output file	output.txt

Example

java -jar UdpStopWaitServer.jar -ip=0.0.0.0 -port=5000 -outfile=received.txt

---

Experiments

Steps

1. Setup:

   • Use iperf to measure bandwidth.
   • Use ping to measure round-trip time (RTT).

2. Run Experiments:

   • Experiment with packet sizes (e.g., 100B, 1KB, 10KB).
   • Record outputs from tools and analyze results with Wireshark.

3. Comparison:

   • Compare theoretical results with actual results using the logs.

---

Files and Logs

• iperf.txt: Bandwidth measurement results.
• ping.txt: RTT measurement results.
• Wireshark PCAP files for packet analysis.
• Logs for transmission details.

---

Contribution

Feel free to submit issues or pull requests for enhancements and bug fixes.