Network Interfaces name Ubuntu 16.04

I try to change my Network Interface Name to the old style eth0, eth1 like with this question:

via this line in grub config it seems to work.

GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"

I changed this line unfortunately I have 2 Network ports, and by random the eth0 port swaps on system boot. What helps?

assigning the mac adress in /etc/udev/rules.d/70-persistent-net.rules helps problem is I have to generically write this file for many computers and we have boards where we need to make sure that a defined port helps e.g. the left one.