Network Loopback Device connected externally

[Stagger_Lee]

See this thread.

It’s a new feature of networkmanager:

Cabled ethernet connection autocreated

It’s not a bug, it’s a new feature: Managing the loopback interface Because of the loopback interface’s somewhat unique characteristics, NetworkManager traditionally treated it specially. That basically meant it ensured it’s up and that’s about it. In the new version of NetworkManager, loopback interfaces are less special. While it’s still a little special – it will be configured even if there’s no connection profile for it – it’s now possible to actually activate a connection profile on a l…