UDP truncation

Vladimir Kudrya vladimir-csp at yandex.ru
Tue May 24 13:04:01 CEST 2016


> 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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