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README.md

IPv6 TCP Client–Server Example

A minimal Python client–server application demonstrating TCP communication over IPv6 using the built-in socket module.

Files

  • IPv6/server.py – IPv6 TCP server
  • IPv6/client.py – IPv6 TCP client

Overview

  • Uses IPv6 sockets (AF_INET6)
  • Communicates over TCP (SOCK_STREAM)
  • Runs on the IPv6 loopback address (::1)
  • Demonstrates basic send/receive message flow

How It Works

  1. The server binds to ::1 on port 9999 and listens for incoming connections.
  2. The client connects to the server using IPv6.
  3. The client sends a message to the server.
  4. The server prints the message and responds.
  5. The client receives and prints the server response.

Running the Example

Requirements

  • Python 3.9+
  • IPv6 support enabled on the system

Start the server

python IPv6/server.py

Run the client (in a separate terminal)

python IPv6/client.py

Expected Output

Server:

Hello from client!

Client:

Hello from server!

Notes

  • This example uses blocking sockets and handles one client at a time.
  • The IPv6 loopback address (::1) restricts communication to the local machine.
  • Intended as a minimal demonstration of IPv6 socket programming, not a production server.