NetDiscover is a tool that is used to identify network hosts through both active and passive ARP analysis. It was primarily written to be used on a wireless interface; however, it is functional in a switched environment as well. In this specific recipe, we will discuss how to use NetDiscover for both active and passive scanning.
To use NetDiscover to perform ARP discovery, you will need to have at least one system on the LAN that will respond to ARP requests. In the examples provided, a combination of Linux and Windows systems are used. For more information on setting up systems in a local lab environment, please refer to the Installing Metasploitable2 and Installing Windows Server recipes in Chapter 1, Getting Started.