Hello,

On 19 Jul 2018, at 16:26, Shane Kerr wrote:

> Someone pointed out to me that since ZONEMD is meta-data we don't really 
> expect it to be queried normally, and a TTL of 0 is a reasonable default.

I recall a story about some resolver (Google Public DNS perhaps?) applying the 
lowest TTL per name, instead of per RRset. This, if true, would argue against 0.

Kind regards,
-- 
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/

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