On 1 Nov 2018, at 14:49, Brian Dickson <brian.peter.dick...@gmail.com> wrote:

> So, giving this some tiny bit of thought:
> When is zonemd added to a response, is that when doing an AXFR?

Construction of ZONEMD RRs and responding to AXFR are orthogonal.

> Maybe signaling the algorithm(s) for which signature(s) are 
> desired/understood would do the trick?
> I.e. in an EDNS option?

I don't think so. EDNS options relate to servers exchanging DNS messages. 
ZONEMD relates to zones.


Joe

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