Tinc will fragment UDP packets that are larger than the discovered path
MTU and that don't have the DF bit set. Could it be that you have a
firewall rule somewhere that is blocking fragments?
You mean inside network? No, nothing is blocked inside, and nothing
specifically blocks fragmented on outside routes (unless providers
messing with traffic).
For now I worked around this by setting tinc's tap device mtu to 1300 on
every host. But any other clues would be handy.
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