If you haven’t already, you need to install Scapy with pip. Scapy is a packet manipulation tool written in Python.

Using Scapy, we will send SYN packets to a range of port numbers, listen for SYN+ACK replies, and hence determine which ports are open.

To establish the connection, Host P sends a final ACK packet. If Host Q is listening on the target port and willing to accept a new connection, it will reply with a SYN+ACK packet. Details of the code used in the examples and projects are explained in detail.When Host P wishes to connect to Host Q, it will send a SYN packet to Host Q. The examples and projects which are used in the course are used for real time network testing, security testing, network monitoring, network analysis, protocol testing and more. It also teaches how to code and automate network automation activity by using Python as a wrapper. The course teaches how to use scapy as a beginner and to write your own custom packets. It is used to create different types of TCP/IP headers like IP, TCP, UDP, ARP etc. Scapy is a packet crafting framework which is used for creating custom scripts and tools. The course uses examples and projects where the actual working of the scripts along with detailed explanation of the code is provided. Starting from the fundamentals of packet crafting, the course explains how to craft packets with Scapy and how to integrate and automate it with Python to write your own network programs and tools. The Python network programming course for network and IT engineers teaches how to perform network scripting and code your own network scripts and tools using Python and Scapy for different areas like network engineering, network scanning, penetration testing, Protocol testing and packet crafting.

Python3 scapy tutorial