On Wed, 14 Jan 2026, Robert Edmonds wrote:
Petr Špaček wrote:
Is it 'protocol-legal' to have multiple identical RRs in the message?
I would think it is not, but also I don't see test prohibiting it.
"...servers should suppress such duplicates if encountered."
(RFC 2181, Section 5)
"A Resource Record Set should only be included once in any DNS reply.
It may occur in any of the Answer, Authority, or Additional Information
sections, as required. However it should not be repeated in the
same, or any other, section, except where explicitly required by a
specification."
(RFC 2181, Section 5.5)
This advise of suppressing it seems outdated, as it would invalidate the
RRSIG over the RRset.
Paul
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