[dns-operations] DNS Issue

Tony Finch dot at dotat.at
Wed May 1 17:27:39 UTC 2013

Florian Weimer <fw at deneb.enyo.de> wrote:
> I think you still can't serve UDP over IPv6 without per-client sate,
> keeping both full RFC conformance and interoperability with the
> existing client population.  Pre-fragmentation to 1280 or so bytes
> isn't enough, you also have to generate atomic fragments.

Or don't fragment and restrict the EDNS buffer size to 1280. I'm somewhat
amazed that DNS-over-fragmented-UDP works as well as it does. See also

f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Forties, Cromarty: East, veering southeast, 4 or 5, occasionally 6 at first.
Rough, becoming slight or moderate. Showers, rain at first. Moderate or good,
occasionally poor at first.

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