PingTimeout

[Cédric Lemarchand]

Le 24 juil. 2013 à 21:55, Guus Sliepen <guus at tinc-vpn.org> a écrit :

> On Wed, Jul 24, 2013 at 09:29:58PM +0200, Cédric Lemarchand wrote:
> 
>> I use tinc with QOS, and since some weeks I got problem with tunnel
>> disconnection because the default "Pingtimeout" of 5 sec is reach.
>> I think it happens because of the QOS shappe the tinc traffic (data
>> here) to let some BP for VOIP, but whate is very strange is that the
>> ICMP protocol is not include in the shapping, so tinc would never
>> 'see' latency on the link, even if there is latency caused by the
>> QOS.
>> 
>> So the question is does tinc really use ICMP to check remote hosts
>> or use it's own UDP packets ?
> 
> Tinc uses its own UDP packets the check other hosts. This is done on purpose,
> so that they don't get a special treatment compared to the regular UDP packets!

Ok, bad news for me then ;-), but its the best implementation choice for most of the uses for sure.
I think there no way to ask tinc to use ICMP for those checks, or classify this cain of Tinc traffic ? (Which use the udp port 655 channel)

Of course the work around is to rise up the timeout value, but I am a bit afraid of the effect in case of "real" latency on the link. 

> 
>> A second one would be : does tinc check the remote host only when
>> there is no traffic on the wire ? which, when I read the man, would
>> tend to be yes ;-)
> 
> It always checks the remote host every PingInterval seconds.
> 
> -- 
> Met vriendelijke groet / with kind regards,
>     Guus Sliepen <guus at tinc-vpn.org>
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