TIL about the naming scheme of systemd network interfaces while reading the Proxmox VE documentation to setup a new node!

They always appear to be random letters and numbers, but (surprise, surprise) there is a schema behind it. The related man page man systemd.net-naming-scheme tells you everything you need to know. For example enp0s31f6 translates to PCI ethernet network device on PCI bus 0, slot 31, function 6. Learn more about it in the systemd.net-naming-schme man page.