When new network card added, interface names shifted

[lajblt]

Hello,

I have pfSense system on Supermicro miniATX board. Everything goes fine. But after adding another network card to PCIe slot, installation was completely broken due to interface names shift.

Before:
WAN - igb0
LAN - igb1
OPT1 - igb2
OPT2 - igb3

After:
(new dual interface card)
OPT3 - igb0
OPT4 - igb1
(old mainboard)
WAN - igb2
LAN - igb3
OPT1 - igb4
OPT2 - igb5

If new network card use the same driver (igb) as old one, interface names change. If new network card use different driver (eg. Realtek - rl), nothing happens and system is running fine. Is it bug or feature?

[stephenw10]

The interfaces are named in the order they are discovered when scanning the PCI device tree at boot.
If you add more interfaces that use the same driver those may be discovered first offsetting the existing interfaces as you discovered. It's the expected behaviour, there's nothing we can do to change that.

Steve

[lajblt]

OK, thanks for reply.