Reliability of Tinc under load

[Etienne Dechamps]

On Wed, Oct 29, 2014 at 10:05 AM, Dominik George
<dominik.george at teckids.org> wrote:
>> # ping -M do -s 1400 terra
>> PING terra.lan.teckids.org (172.30.254.254) 1400(1428) bytes of data.
>> From terra.lan.teckids.org (172.30.254.254) icmp_seq=1 Frag needed and
>> DF set (mtu = 1381)
>
> Hold on a minute. Is that the *other* end sending us an ICMP error
> reporting that the *other* end has discovered a Path MTU of 1381?

No, tinc is generating these packets locally. It crafts ICMP
Fragmentation Needed packets and makes them look like they came from
the destination of the original packet.