[avahi] network down does not remove services

Trent Lloyd lathiat at bur.st
Wed Jan 13 20:32:58 PST 2010

there's a potential improve to avahi here, a "pre network interface down" mode to send goodbytes.


On 14/01/2010, at 3:41 AM, Lennart Poettering wrote:

> On Wed, 13.01.10 12:16, ecfu (ecforusers at gmail.com) wrote:
>> When a node on my network goes down, I notice my avahi-browse keeps the
>> services from the gone node.  Even if I kill the avahi-browse process and
>> re-browse the services are still there.   The only way to know that those
>> services are gone is to try to resolve them (or at least that is all I have
>> found that I can do).  Am I just not waiting long enough?
>> Is there a way to know that the node has dropped off and the services have
>> been removed?  Does this have to do with my network more than Avahi?  Or is
>> there a timeout configuration setting I can set?
> If a service becomes unavailable and no goodbye packet is sent for it
> (for examnple, because the network went away before the mDNS daemon
> that registered it could send out a msg), then the TTL of DNS RRs will
> control how long the entry lingers in the other peer's caches.
> To put it simply: in modern IP networks there is no way to notice if a
> machine dropped off the network. And since for traffic reasons we
> cannot continously ping the machine we hence can get notified about
> that only after a certain delay. There is no way around it.
> Lennart
> -- 
> Lennart Poettering                        Red Hat, Inc.
> lennart [at] poettering [dot] net
> http://0pointer.net/lennart/           GnuPG 0x1A015CC4
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