Introduction to Scapy

In order to create a network scanner, we will use a Python networking library called Scapy. This library is designed to send, sniff, dissect, and edit network packets. Scapy is a very powerful network packet manipulation tool. To read more about the tool, you can go to the following link: https://scapy.readthedocs.io/en/latest/introduction.html.

Installing Scapy

To install Scapy, first open the terminal. Let's understand a few things first. In Linux, there are two user privileges, user and root, and the environment for both users is different. Higher privileges are required for system-level commands. To send and receive packets, we will need to install Scapy as a root user as well as a normal user. We will write our program as a normal user and when we run it, we will run it as root as sending packets requires higher privileges in Linux (you can think of it as the Run as Administrator equivalent in Windows). You will see what I mean in a moment. To...