Bug#1101975: systemd-resolved: resolved no longer resolves mdns, despite being configured to

[Russ Dill]

> Hi,
>
> On Thu, Apr 03, 2025 at 10:21:07AM +0000, Herbert Snorrason wrote:
> > After an upgrade today, resolved appears to have stopped resolving mDNS queries,
> > despite previously having done so and still being configured to do so. This
> > appears to be the result of a new override file that appeared in the
> > package. Unlike multiple other changes that require action to maintain an
> > existing configuration, I did not get any sort of alert in the upgrade process.
>
> This is correct. The Debian Technical Committee asked the systemd
> maintainers to disable mDNS support in the default configuration. The
> chosen implementation was to place an override file.

The method of doing this is overriding the setting of
'MulticastDNS=yes' in the /etc/systemd/resolved.conf file. The only
way to get past this is to remove the override file, or create a
overriding override file in /etc/systemd/resolved.conf.d/