# returned. Because 'interface' is decremented as each interface is processed,
# by the time is_primary=True (primary) interface is reached, the device
# "eth<interface>" is not eth0. But, something like eth-4, or eth-12.
# returned. Because 'interface' is decremented as each interface is processed,
# by the time is_primary=True (primary) interface is reached, the device
# "eth<interface>" is not eth0. But, something like eth-4, or eth-12.