But about the ifconfig -a command; it only reports the interfaces
configured in the /etc/X11/interfaces file, so (in my case) if I _do not_
edit the /etc/udev/rules.... file as you said and I change into my
/etc/X11/interfaces file my eth2 back to eth0, ifconfig would never see eth2
back. I'm asking if there is a command that can say me: no, you don't have
an eth0, you have an eth33 (for example). Of course now I know that I can
see inside the 70-persistent-net.rules files and look for them (thanks
again)