PingTimeout

[Etienne Dechamps]

(Hey Cédric, it appears we're both following tinc *and* ZFS On Linux. 
What are the odds...)

On 24/07/2013 20:29, 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 doesn't use ICMP. It uses PING/PONG messages on the TCP 
metaconnections to ensure the control graph is healthy, and UDP messages 
(MTU probes) to opportunistically check for potential UDP connectivity.

If your nodes are getting disconnected because of timeouts, it's because 
tinc's PING/PONG messages are not getting through on your TCP 
metaconnections.

-- 
Etienne Dechamps