Last I looked at resolvers 20 years ago (like BIND), they just grabbed the first query RR and ignored all other RRs.
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And how about forwarders such as dnsmasq or systemd resolved? Would they forward these additional RRs upstream?
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EDNS stuff goes into the additional section. See https://en.wikipedia.org/wiki/Extension_mechanisms_for_DNS …
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That states unknown OPT records should ignored. No mention of what to do with other resource records.
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IMHO, they should not choke. But the Internet is large and full of errors. (© Melisandre of Asshai)
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I don't think so. Worst case, they should just ignore it.
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