[avahi] Linsys E4200: Received response with invalid source port

Christiano F. Haesbaert haesbaert at haesbaert.org
Tue Jul 19 07:34:05 PDT 2011

On Tue, Jul 19, 2011 at 02:31:01AM -0400, Andrew wrote:
> > On 18 July 2011 15:01, Eric Martel <shrodi+avahi at gmail.com> wrote:
> >>
> >> But doesn't the draft also specify that "Multicast DNS implementations
> >> MUST silently ignore any Multicast DNS Responses they receive where the
> >> source UDP port is not 5353."? Shouldn't avahi therefore ignore thos
> >> responses instead of reporting them? Is there a way for me to tell it
> >> so?
> >>
> >
> > It is ignoring, in the way that is not considering it a valid answer,
> > but it is reporting.
> >
> > Now "silent" I'd say it's just semantics, it's nice to have a warning
> > or a message that "something weird is happening", it does not affect
> > the system at all. When the draft says "silently" it implies "nothing
> > should be done", logging the event is a nice thing IMHO, you would
> > spend a lot more time to conclude this fact if it was not for the
> > reporting.

Sounds like bloat to me, can't see the point.

> >
> > Use tcpdump and verify that avahi is correct (ie: source port is
> > wrong), if it is, it's your router's fault.
> > I don't know much of avahi, I only know mdns quite well.
> Ideally, you should be able to tell avahi, via its conf file and/or
> command line, what priorities (e.g., err, notice, debug) you want logged. 
> Supposing this particular message has a priority of "notice" (normal, but
> significant), you could tell avahi to log only up to "err" or "warning". 
> However, I don't see any provision for this on the avahi man pages.
> On the syslog side of things, you might try this:  Determine what
> "facility" name avahi is using for logging.  Then determine what log level
> avahi is using for this particular message that is "clogging" your logs. 
> Assuming the level is just, say "info", or perhaps even "notice", adjust
> /etc/syslog.conf to filter out this log level for this facility (or to
> direct such messages to a separate log file).
> The only problem with this suggestion is, of course, that all messages of
> this log level for this particular facility will also be lost (or placed
> in the alternate file).
> I hope this helps.
> _______________________________________________
> avahi mailing list
> avahi at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/avahi

Christiano Farina HAESBAERT
Do NOT send me html mail.

More information about the avahi mailing list