On Mon, Feb 13, 2017 at 11:46 AM, Tony Finch <d...@dotat.at> wrote: > OK. But does an EDNS flag help? What if you are using old tools?
If you are using old tools, then you don't get new conveniences (the same is true of using OPT class to specify a maximum payload size exceeding 512 bytes, using the DO bit to request DNSSEC records, and using the COOKIE option for authentication). But a flag would still be there, conveying information even if any given client or tool isn't looking for it.
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