Re: New connection appears after unplugging Ethernet

[Thomas Haller <thaller redhat com>]

On Sun, 2022-04-24 at 22:00 +0000, Martin wrote:
> Dears,
>
> when I *unplug* the Ethernet of my laptop computer, a new connection
> "enp0s25" appears out of the nothing. When I plug the Ethernet in
> again,
> my usual connection "Wired" is automatically used, probably because
> the
> other connection "enp0s25" is active?
>
> Before unplugging:
>
> NAME         UUID  TYPE      DEVICE  
> Wired        6...  ethernet  enp0s25 
>
> After unplugging:
>
> $ nmcli con
> NAME         UUID  TYPE      DEVICE
> enp0s25      c...  ethernet  enp0s25
> Wired        6...  ethernet  --
>
> Maybe relevant software versions (Debian testing):
>
> linux-image-5.16.0-6-amd64 5.16.18-1
> network-manager            1.36.4-2
> udev                       250.4-1
>
> How can I prevent a new Ethernet connection on *unplugging* Ethernet?
> Thanks in advance!
>
> Cheers

Hi

the profile with the same name as the device, is usually generated by
NetworkManager in response to an external configuration. You'd see
"connected (externally)" in `nmcli device`.

That usually means that some other program is configuring the device.
Or it would be a bug... to investigate, check the `level=TRACE` log.
Read [1]

[1] 
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/contrib/fedora/rpm/NetworkManager.conf#L27


best,
Thomas