If the name contains a %d format string, the first available device name with the given base is used; assigned numbers start at zero.
On my base machine, I have 1 NIC card which is onboard, rest I can remove and plug. For the onboard card I get the interfaces as em1-4, while all the other cards I get names as p1p2, p3p4 etc.
This looks like systemd's way of naming network interfaces (aka predictable network interface names). Are you running a systemd enabled system? If so, look at this systemd guide for the naming convention: https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfac... HTH, -mandeep
Does Udev know the difference.
How are these names given, definitely there must be some configuration which is used to distinguish on-board card vs removable.
Thanks.
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