Custom TCP Header Construction for Port Scanning with Scapy

Understanding how network packets are structured is a critical skill for security enthusiasts and network administrators. Crafting custom TCP headers allows you to interact directly with network protocols and perform advanced reconnaissance. In this course, you will learn how to use Python and the Scapy library to build raw network packets from scratch. You will transition from understanding basic TCP/IP theory to writing scripts that identify open ports on a target system using SYN scanning techniques. What you'll learn: Understand the fundamental structure of IPv4 and TCP headers, including flags and port fields; Configure a virtual Python environment to safely run Scapy with administrative privileges; Build custom TCP SYN packets using Scapy's intuitive layer-stacking syntax; Analyze network responses to determine if a target port is open, closed, or filtered; Apply modern Python type hints and clean coding practices to your network scripts; Practice packet analysis techniques through written code walk-throughs and structured exercises. You will begin by exploring core networking concepts and packet anatomy before moving on to hands-on packet construction and analysis. The material guides you step-by-step from raw socket theory to running your own custom scanning scripts. This course is designed for beginners in network security, system administration, or Python programming who want to understand low-level networking without complex prerequisites. Start learning how to craft custom network packets and master Scapy today.