How to generate /etc/udev/rules.d/70-persistent-net.rules
sudo INTERFACE=eth0 udevadm test --action=add /sys/class/net/eth0
sudo INTERFACE=eth1 udevadm test --action=add /sys/class/net/eth1
sudo INTERFACE=eth2 udevadm test --action=add /sys/class/net/eth2
sudo INTERFACE=eth3 udevadm test --action=add /sys/class/net/eth3

command to force:   udevadm trigger

useful commands:
ls -al /sys/class/net/*
sudo mii-tool -v