Network scanner using Scapy
In this section, we will create a simple scanner, scan hosts in our local network, and find their MAC addresses. In order to create the scanner, we need to first understand what the Address Resolution Protocol (ARP) is and how it can be used for creating a network scanner.
Address Resolution Protocol
ARP in its simplest form is a translation tool that helps us to translate IP addresses into MAC addresses. Whenever a device needs to communicate with a device within the same local network, it needs the device's MAC address. IP addresses are not used for local communication.
Let's say that device A wants to communicate with device B in a local network. In order to find the MAC address of device B, computer A will first look inside an internal list maintained by it called the ARP cache to see whether computer B's IP addresses are mapped to a physical MAC address inside its table. This is called an ARP table as well. You can check the...
