[Pkg-mpd-maintainers] Bug#813754: Bug#813754: Bug#813754: Bug#813754: Can't open port 6600 when run syste, -wide vis systemd

[Lisandro Damián Nicanor Pérez Meyer]

On martes, 13 de diciembre de 2016 21:23:46 ART Florian Schlichting wrote:
> Hi Matthew,
> 
> On Tue, Dec 13, 2016 at 05:34:28AM -0500, Matthew E. J. Draisey wrote:
> > I just fixed a situation where I couldn't get mpd to work over my home
> > network. I think it may be this same issue.
> > 
> > On my system
> > 
> >     # sysctl net/ipv6/bindv6only
> >     net.ipv6.bindv6only = 1
> > 
> > netstat would show init listening on [::]:6600 but doesn't report the
> > IPV6_V6ONLY socket state so I had missed there was no socket listening on
> > ipv4.
> > 
> > Adding
> > 
> >     [Socket]
> >     BindIPv6Only=both
> > 
> > to the mpd.socket unit fixed my problem.
> 
> that's an interesing observation. Lisandro could you check that?

Yes, and while the mentioned workaround doesn't solves my issue it clearly has 
something to do.

Remember my original bug where I stated that I needed to stop the systemd 
service and then start it by the init.d script?

Well, thanks to this I've discovered that if I stop mpd.socket and then 
restart mpd.service I get both the IPV4 and IPV6 6600 port opened, whereas 
with mpd.socket I can only open the IPV6 one.

Yes, my system also has net.ipv6.bindv6only = 1 (I don't remember changing it 
myself). If I stop mpd.socket/service and then:

sysctl -w net.ipv6.bindv6only=0

and then restart mpd.socket I still only get the IPV6 behavior.

Now I'm going to update this machine (it has been off for ~3 months) and try 
again.
 
> AFAIK net.ipv6.bindv6only defaults to "both", so as a package maintainer
> I wouldn't override a local configuration where the admin has decided to
> deviate from the default.

Well, I don't remember having changed this, but it's clearly ipv6only here :-/

-- 
No subestimes el ancho de banda de un camión
cargado de cintas.
  Andrew S. Tanenbaum

Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/
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