Systemd predictable network interface names are awesome.
Not only I get easy to remember names like enp2s0f0u7u3c2 but I _also_ get to experience a machine not coming back up after reboot because a new (non-NIC!) PCIe card caused existing names to shuffle around.
@q3k Here's another fun thing:
Power machines can have differen PCIe busses, so you can actually get things like
`enP19p96s0f0`, and if your driver decides, even `enP19p96s0f0np0` .
IF you then want a VLAN on that, the canonical name would be something like
`enP19p96s0f0np0.1450`. Thats 20 characters. Interface names *can only* be 16 (in practice 15) characters long.
Fun esues.
OMG don’t bring back the PTSD about name length restrictions. cm-usb3-a-gige (strlen = 14) u-dev rule works fine, ms-usb3-a-dongle (strlen = 16) => ‼️🚨🚫 I finally find in logs (networkctl info or status IIRC) a cryptic error from networkd where the only Google result is the error in the systemd repo. 🤦♂️ At least once I got that far it took about 15 minutes to realize my folly but they really need to plumb the error reason up to the log message output point!
q3k 
Tobias
Jevin Sweval