[Pkg-utopia-maintainers] Bug#1077937: avahi-daemon: WARNING: Detected another IPv4 mDNS stack running on this host. This makes mDNS unreliable and is thus not recommended.

[Laurent Bigonville]

Package: avahi-daemon
Followup-For: Bug #1077937
X-Debbugs-Cc: Luca Boccassi <bluca at debian.org>, Michael Biebl <biebl at debian.org>, Simon McVittie <smcv at debian.org>

Hello

Before appealing to the CTTE, I see that the MulticastDNS= option of
resolved has a "resolve" option since 234.

When setting that option it seems that both avahi and resolved continue
to complain about the double stack but avahi stops printing errors in loop
about "Host name conflict".

Looking at the code, it seems that both avahi and resolved set
"SO_REUSEADDR" on the socket explicitly "for the case that the user
really wants multiple mDNS responders", but I'm not sure whether this
has other impact. I see that both avahi and resolved are listening on
the port 5353/udp.

Has anybody better understanding on this?

In anycase, this is a "serious" bug to me as it NEEDS to be fixed before
the release by either avahi or resolved.

@Lucas, would it be OK for you to set "MulticastDNS=" to "resolve" if
it's not causing other issues?

Otherwise we indded need to turn to the ctte

Kind regards,
Laurent Bigonville


-- System Information:
Debian Release: trixie/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.6-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=fr_BE.UTF-8, LC_CTYPE=fr_BE.UTF-8 (charmap=UTF-8), LANGUAGE=fr_BE:fr
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages avahi-daemon depends on:
ii  adduser                         3.137
ii  dbus [default-dbus-system-bus]  1.16.0-1
ii  libavahi-common3                0.8-15
ii  libavahi-core7                  0.8-15
ii  libc6                           2.40-4
ii  libcap2                         1:2.66-5+b1
ii  libdaemon0                      0.14-7.1+b2
ii  libdbus-1-3                     1.16.0-1
ii  libexpat1                       2.6.4-1

Versions of packages avahi-daemon recommends:
ii  libnss-mdns  0.15.1-4+b1

Versions of packages avahi-daemon suggests:
ii  avahi-autoipd  0.8-15

-- no debconf information