NetworkManager
IPv6
privacy extensions
To use IPv6 privacy extensions globally:
- /etc/NetworkManager/conf.d/ip6-privacy.conf
[connection] ipv6.ip6-privacy=2
(source)
FAQ
what's the difference between IPV4 (uppercase) and ipv4 (lowercase) prefixes in nmcli?
The uppercase directives refer to the active connection being used. Whereas the lowercase refers to the connection profile, so it's specific to what connection you configure and at some point activate.