On 10/31/18 19:50, Joe Abley wrote:
It sounds wrong to me to say that identical instances of RRs would not be
allowed in a zone.
It's true though, right? It's not meaningful to include more than one resource
record with the same (owner,type, class, TTL, RDATA) in the same RRSet, and
hence also not meaningful to include such duplicates in a single zone (which is
a particular set of RRSets). I don't think RFC 1034 is explicit about this, but
it's surely implied. I don't know of any nameserver software that would allow
duplicates like that, though, with the possible exception of the SOA. Quite
possibly I have just typed more nonsense about this than the world ever needed
to see.
RFC 2181 section 5: "It is meaningless for two records to ever have
label, class, type and data all equal - servers should suppress such
duplicates if encountered."
And RFC 7719 section 4 affirms the "different data" requirement.
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