@Doomed_Daniel@vees@dan The extra challenge round is that people want to be able to pull a network card, replace it with an identical spare one, and get the same interface names rather than new ones (or swap system disks into a new set of identical hardware, for motherboard ports). This makes MACs and other serial numbers bad. Unfortunately PCIe enumeration isn't stable if there are any hardware changes (not just the network card), for reasons.