On Sat, 2022-05-14 at 07:38 +0300, Andrei Borzenkov via networkmanager-
list wrote:
> > 
> > 
> > The background is a security requirement. Unused interfaces must
> > ideally remain disabled at the physical layer when a cable is
> > plugged
> > in. Ideally, the LEDs would also remain dark.
> > 
> It sounds like
> no-auto-default=*
> mostly does what you want.

that option merely disables that NetworkManager will automatically
generate a profile for ethernet devices, that don't have a profile yet.
Such profiles are called "Wired connection 1", which is how you can
recognize it.

This does very little magic, you can manually create a profile to the
same effect. In any case, NetworkManager would have already set the
interface IFF_UP at this point -- regardless of "(no-)auto-default".


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