I have a Asus P5B Motherboard with an IDE controller, that may be disabled. I usually have it disabled. Only sometimes I enable it. I do not use the onboard network controller, but an PCI card.

Everytime when I enable the IDE controller in the BIOS, the name of the network device changes (in /sys/class/net) and thus breaking my network configuration.

For more information please have a look at this thread: https://bbs.archlinux.org/viewtopic.php?id=199647