[avahi] How to debug avahi over subnets

[Marc Haber]

Not a single hint?

Greetings
Marc

On Mon, Sep 17, 2018 at 11:08:18AM +0200, Marc Haber wrote:
> I have my printer on a different subnet than the CUPS server, the
> requests need to pass a router. CUPS server (parada) and router
> (barrida) are both running Debian stable, with avahi 0.6.32. I'd rather
> not upgrade to 0.7 unless I know positively that this will fix my issue.
> My printer is a Lexmark C534 called c534-ka51.
> 
> Regularly, but not reproducible, a record for c534-ka51.local seems to
> remain stuck in the Avahi world. As a result, turning on the printer
> will register "c534-ka51 (2)" visible on the CUPS server (parada) with
> avahi-browse -a:
> 
> +   eth0 IPv4 c534-ka51 (2)        Internet Printer     local
> +   eth0 IPv4 c534-ka51 (2)        UNIX Printer local
> +   eth0 IPv4 c534-ka51 (2)        Web Site local
> 
> Unfortunately, the CUPS erver wants to see c534-ka51._printer._tcp.local
> which doesn't seem to be registered in avahi, not even on the router
> (barrida). I'd paste avahi-browse --resolve --all output here, but it's
> too long. It doesn't contain the string _printer though upon turning on
> the printer.
> 
> avahi-daemon --debug is unhelpful, no output at all on barrida when the
> printer comes online. The debug output does only seem to mention changes
> for local services.
> 
> How do I debug this? How can I find out why
> c534-ka51._printer._tcp.local does not show up? What blocks the printer
> from registering as "c534-ka51" without the dreaded (2)? How can I
> force-unregister a stuck "c534-ka51" without (2)? Why does restarting
> avahi daemons on parada and barrida and the printer not resolve the
> issue?
> 
> Any hints will be appreciated.
> 
> Greetings
> Marc
> 
> -- 
> -----------------------------------------------------------------------------
> Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
> Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
> Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421

-- 
-----------------------------------------------------------------------------
Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421