[dns-operations] FlagDay 2020 UDP Size

Ralf Weber dns at fl1ger.de
Wed Aug 5 09:33:03 UTC 2020


On 5 Aug 2020, at 0:51, Tony Finch wrote:

> Viktor Dukhovni <ietf-dane at dukhovni.org> wrote:
>> What I haven't seen reported is measurements of problems that occur when
>> the EDNS(0) UDP buffer size is *too small*.
> A full service resolver should not have a fixed buffer size but instead
> probe for what works. They pretty much already do so.
I disagree. Probing introduces unnecessary packets and round trips and
the way of your packet might change overt time to the same server causing
a drop on one way, but not the other. While some implementations might
do this I don’t think it is something we should recommend or make

So long
Ralf Weber

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