[jdev] Presence - how often?

Dave Cridland dave at cridland.net
Thu Dec 11 07:43:34 CST 2008

On Thu Dec 11 13:19:46 2008, Tomasz Sterna wrote:
> Dnia 2008-12-11, czw o godzinie 13:59 +0100, Jonathan Schleifer  
> pisze:
> > So the the problem is the timeout in Gajim, and disabling it  
> helps, as
> > Dave already said. But disabling  it is not always the best  
> solution,
> > because then you also won't notice when the connection is really  
> dead.
> Whitespace keepalive sent every now and then detects dead connection
> pretty fine.

You're thinking the TCP retransmission timeout, and max retries as  
well, which'll typically break the connection are around 10-30  
minutes or so *if* there's data being sent - by sending whitespace  
you simply force that condition. A completely silent connection has  
no timeout at all, and this is by design - as long as IP addresses  
don't change, you can completely lose the network without any damage.  
In order to detect a downed connection properly, you need to use  
either 198 or 199 pings.

Dave Cridland - mailto:dave at cridland.net - xmpp:dwd at dave.cridland.net
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