Since 197 was just tagged and there still seems to be some confusion,here's an FAQ:*** What happens after installing systemd 197?
For existing installs: Nothing happens, and this is strictly opt-in.A post_upgrade() message will mention the feature and add a dummy filecalled /etc/udev/rules.d/80-net-name-slot.rules to mask the new rulewhich performs the renaming.
If you wish to opt-in, remove this dummyfile. Next reboot, the rule will take effect.For new installs: You are opted-in to this change. The post_install()will do nothing to mask the rule.
If you wish to opt out, you can do 1of 2 things:
1) mask the rule: ln -s /dev/null /etc/udev/rules.d/80-net-name-slot.rules
2) provide your own udev rule that applies a NAME to the interface. As long as this rule is ordered lexically before 80-net-name-slot.rules, then the upstream rule will have no effect. For example, providing a file called 70-net-naming.rules will trump 80-net-name-slot.rules.