On Sat, Nov 03, 2018 at 03:12:28PM +0700, Mukund Sivaraman wrote:
> The D flag seems unnecessary. Just the presence of the EDNS option in
> query from the client should serve to indicate to a server that the
> client explicitly does not want stale answers.

I withdraw this comment. It appears that the client can also find out
whether an option is stale by sending the option.

                Mukund

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