[dns-operations] PMTUD of .org servers

[Michael Graff]

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Florian Weimer wrote:
> Is it just me, or do some of the .org servers (notably
> 199.19.56.1/a0.org.afilias-nst.info) ignore ICMP "fragmentation
> needed, but DF bit set" message, even though they set the DF bit in
> the IP header of the response packet?

Is PMTU even defined on UDP?  IMHO, UDP should not have DF set in the
common case, and never for DNS.  I thought PMTU was more of a TCP thing
anyway?

- --Michael
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