[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 #7 from Ajay Garg <ajaygargnsit at gmail.com> 2012-07-04 05:59:18 UTC ---
(In reply to comment #5)
> (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?

Thanks a ton Simon for your technical analysis.

So, what would you suggest ::

a)
Should telepathy change the TTL to "AVAHI_DEFAULT_TTL_HOST_NAME" (if possible)
for all  cases ?


b)
Should Avahi change the TTL to "AVAHI_DEFAULT_TTL_HOST_NAME" for all cases ?
If yes, what is the bugtracker/mailing-lists for Avahi?



c)
If either of a) or b) is followed, would it cause one of the exisiting
telepathy signals' callbacks to be hit? (for
http://telepathy.freedesktop.org/spec/Connection_Interface_Contact_List.html#Signal:ContactsChangedWithID
??)



d)
Any how, if this is a simple fix, please do let me know the approach to be
followed. I will be too happy to come up with a patch :D :D


Thanks again Will and Simon for your time.



Regards,
Ajay

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