🛡️ Basic Firewall Using Python

📖 Overview

This project is a simple Python-based firewall that monitors and filters network traffic based on user-defined rules. It provides an introductory understanding of how firewalls work at the network (Layer 3) and transport (Layer 4) levels.

⚙️ Features

• Real-time monitoring of incoming and outgoing packets
• User-defined blocking of IP addresses and ports
• Logs blocked and allowed packets to the console
• Built using Python’s socket and Scapy libraries

🧠 Working Principle

1. The firewall captures network packets using Scapy.
2. It checks each packet’s:
   • Source and destination IP address (Layer 3)
   • Source and destination port number (Layer 4)
3. If a packet matches a blocked IP or port, it is marked as blocked.
4. Otherwise, it is allowed and displayed on the console.

🧩 Requirements

• Python 3.x
• Install Scapy library:

  pip install scapy