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<div class="moz-cite-prefix">On 20/02/2026 20.36, Tatsuya Jinmei via
dns-operations wrote:<br>
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cite="mid:mailman.547.1771616175.4644.dns-operations@lists.dns-oarc.net">
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<span class="elementToProof">Thank you for the prompt response.
Yes, I know the practice of synthesizing NXDOMAIN. That's all
about RFC6303.</span></div>
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<span class="elementToProof">My question was about the missing
EDNS OPT RR in the synthesized response. It's good to know
that it's juse likely a bug.</span></div>
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<p>The SOA is also useful in such responses. For caching. But I
expect it's mainly risk for CloudFlare; they might provoke too
frequent retries/refreshes.</p>
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