Red Hat Enterprise Linux 7 still offers a possibility to specify names for network interface by setting the DEVICE and HWADDR options in the /etc/sysconfig/network-scripts/ifcfg-* configuration files. Unfortunatelly, udev does not support swapping interface names anymore. In the case that you set ethX names to multiple network card, and kernel discovers them in a different order, udev rule 60-net.rules will most likely fail.
It is highly recommended to rename such interfaces or remove the DEVICE line from the ifcfg configuration files.
Red Hat Enterprise Linux 7 also introduces predictable network interface device names. For more information, see [link:http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/].
