[Pkg-utopia-maintainers] Bug#764084: avahi-daemon creates eth0:avahi briefly after startup overriding wlan0, no eth0 connected

[Ævar Arnfjörð Bjarmason]

On Sun, Oct 5, 2014 at 2:15 PM, Ævar Arnfjörð Bjarmason
<avarab at gmail.com> wrote:
> On Sun, Oct 5, 2014 at 1:45 PM, Ævar Arnfjörð <avarab at gmail.com> wrote:
>> I'm just going to solve this problem my disabling
>> avahi-autoipd/avahi-daemon, I don't need a ZeroConf daemon for
>> anything, but this seems like really odd and buggy default
>> behavior. Why would it be creating an eth0:avahi interface that
>> overrides the default wlan0 route?
>
> How does one disable this daemon anyway? This doesn't work:
>
>     $ sudo update-rc.d -f avahi-daemon remove
>     $ sudo update-rc.d avahi-daemon defaults
>
> Neither does setting this in /etc/defaults/avahi-daemon as some
> sources I googled suggested: AVAHI_DAEMON_START=0. An old bug report
> to this package (#462155) says that's been removed and you should use
> this instead:
>
>     $ sysv-rc-conf avahi-daemon off
>
> That doesn't work either, it keeps starting up after reboot. It
> doesn't work either to set this in avahi-daemon.conf, it creates
> eth0:avahi still:
>
>     deny-interfaces=eth0,wlan0,tun0
>
> Manually stopping it suggests that it may just be started again
> implicitly when something accesses its socket:
>
>     $ sudo service avahi-daemon stop
>     Warning: Stopping avahi-daemon.service, but it can still be
> activated by: avahi-daemon.socket
>
> And indeed doing that has no effect, even killing it just brings it
> right back up:
>
>     ==> /var/log/daemon.log <==
>     Oct  5 14:14:54 snth avahi-daemon[3475]: avahi-daemon 0.6.31 exiting.
>     Oct  5 14:14:54 snth systemd[1]: Stopped Avahi mDNS/DNS-SD Stack.
>     Oct  5 14:14:54 snth dbus[676]: [system] Activating via systemd:
> service name='org.freedesktop.Avahi'
> unit='dbus-org.freedesktop.Avahi.service'
>
> So maybe I'm missing something really obvious but if you could tell me
> how this service can be stopped that would be much appreciated.

Eventually I found that just:

    sudo aptitude remove avahi-autoipd

Along with:

    systemctl disable avahi-daemon.service
    systemctl disable avahi-daemon.socket

And possibly:

    systemctl mask avahi-daemon.service
    systemctl mask avahi-daemon.socket

That last one might be redundant, or possibly the last two. But I got
tired of exhaustively testing this. So I think this bug report should
be moved to be a gainst the avahi-autoipd package.