Do DNS resolvers choke if a question contains RRs in the additional section? Are they supposed to?
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Any nameserver that doesn't understand the query for any reason can send FORMERR (RFC 1035 §4.1.1, RFC 8499 §3). paging
@nuthaven for a more specific reference regarding FORMERR on spurious records in the query. -
Types defined for the additional section in a query are OPT, TKEY and TSIG. AFAIK, other types should be ignored. 2845 §4.1 says "Note that some older name servers will not accept requests with a nonempty additional data section" which I take to imply there was no clear rule.
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New conversation -
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I also read that as malformed or otherwise invalid OPT records should cause FORMERR, it does not talk about non-OPT records AFAIKS
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