>    This message starts a Call for Adoption for "Greasing Protocol
>    Extension Points in the DNS" (see
>    [1]https://datatracker.ietf.org/doc/draft-huque-dnsop-grease/)

There is quite a bit I find confusing in this draft. 

For example, Table 1 shows that are 16 opcodes. But if I send a request
with a different opcode then my original request will not go out. Does
the draft want me to send an additional request? A similar issue exists if
the Qtype is changed.

Then the DNS Header Flags. We have one flag left. What will happen if
DNS software is putting random values in this unused flag and at a later
time we want to actually use that bit for something?

To me it seems better if the authors would write an implementation and
give a clear algorithm how grease should be applied. Otherwise there may
be quite a bit of work for the working group to sort it all out.

If I dismiss the DNS Header Flags, the Resource Record Type and the Opcode
as hard to grease, then what is left is various EDNS code points. 

I'm a bit worried there that it might make EDNS harder to use. Some
experiement might be in order to see how much would break in the current
internet.

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