Reliability of Tinc under load

[Etienne Dechamps]

On Wed, Oct 29, 2014 at 9:59 AM, Dominik George
<dominik.george at teckids.org> wrote:
> That looks strange to me. Where is that final MTU of 1381 enforced? Why
> does it change over time?

tinc enforces it. It will reject any oversized packet with DF set.

> Could it be possible that Tinc did its PMTU discovery magic in that moment?

Yes.

You can confirm what tinc is doing by running it with max log level
(-d5). The log will show tinc nodes exchanging PMTU probes. It will
also show oversized packets being rejected.