> My questio is:  How can I know what name is asigned to a such a card?
> Is there any command?

ifconfig -a

> I have only one and it's eth2, why?

When you swapped motherboards, udev saw new Ethernet interfaces with new 
MAC addresses, so it assigned new names to them.  The same thing would 
happen if you had physical PCI cards, and you were swapping them around.
It always generates unique names for each unique MAC address that it sees.

You can rename it back to eth0 by editing
/etc/udev/rules.d/70-persistent-net.rules



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