Documentation Networking Beat
stable network interface naming
The udevd service has a long history of providing predictable names for block devices and others. Fedora will now also use udev naming for network interfaces by default, providing more reliable interface names on systems with multiple network devices. Alternative naming schemes, such as custom udev rules or biosdevname, will override this default. Users upgrading from previous releases may need to update the device names referenced in `/etc/system/network-scripts`, although in most cases `biosdevname` will continue to manage naming.
For more information, read http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames .