Bosy-Ayman/Go-Back-N

This project implements the Go-Back-N (GBN) protocol for reliable data transfer over UDP. It includes sender and receiver components for handling packet transmission, acknowledgments, and timeouts.

Introduction:

The Reliable Transport Protocol addresses the challenge of ensuring data transfer reliability over an unreliable network. This protocol offers a reliable channel for data transfer, handling issues such as packet loss, corruption, and out-of-order packets. Two primary protocols studied are Go-Back-N and Selective Repeat, with the project focusing on implementing the Go-Back-N protocol.

Project Description:

The project aims to implement a transport protocol enhancing UDP's reliability through the Go-Back-N protocol. It involves creating specialized GBN sender and receiver scripts, each with distinct functionalities.

Sender:

• Functionality: Divides the file into chunks and transmits them over UDP using the Go-Back-N protocol.
• Arguments: Requires filename, receiver IP address, and receiver port as input.
• Steps:
  1. Divides the file into segments.
  2. Transmits segments and waits for acknowledgments.
  3. Responds to acknowledgment events (ACK) and timeout events.

Receiver:

• Functionality: Receives packets, stores data, and sends acknowledgments.
• Steps:
  • Upon packet reception:
    • Parses received packet.
    • Stores application data if the packet ID matches the expected ID.
    • Sends acknowledgment with the ID of the last correctly received packet.
  • Upon receiving the last packet:
    • Writes data to a new file.
    • Sends acknowledgment.
    • Indicates file reception completion.

Simulated Loss:

To simulate network conditions, random packet loss (5%-15%) is introduced by randomly dropping received packets at the receiver.