You've been typing the wrong commands for years. Linux moved on, and nobody bothered to tell you.
A MAC address (Media Access Control address) is a 12-character identifier for your network adapter. In theory, it is unique for each network adapter, and the first half of the MAC address gives ...
What relevance does a MAC address have in today's technology? It's trivial to mask or even change your MAC address (linux, Solaris, and even some routers have this ability), so using it as a form of ...