[Bug 51501] Avahi doesn't notify us when a contact drops off the network.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=51501

--- Comment #5 from Simon McVittie <simon.mcvittie at collabora.co.uk> 2012-07-04 03:31:39 PDT ---
(In reply to comment #4)
> https://tools.ietf.org/html/draft-cheshire-dnsext-multicastdns-15#section-10
> suggests that the time-to-live of the mDNS record is likely to be 120 seconds,
> although we might set it to something else in Salut.

Salut doesn't change the TTL from the default. However, PTR records in Avahi
seem to get a TTL of 75 minutes, by using AVAHI_DEFAULT_TTL instead of
AVAHI_DEFAULT_TTL_HOST_NAME:

/** The default TTL for RRs which contain a host name of some kind. */
#define AVAHI_DEFAULT_TTL_HOST_NAME (120)

/** The default TTL for all other records. */
#define AVAHI_DEFAULT_TTL (75*60)

The Internet-Draft says:

   As a general rule, the recommended TTL value for Multicast DNS
   resource records with [...] a host name contained within the resource
   record's rdata (e.g. SRV, reverse mapping PTR record, etc.) SHOULD be
   120 seconds.

so this is probably an Avahi bug?

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