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A comment on 5 out of 7 .io nameservers appear to be down. Parent comment

Re:5 out of 7 .io nameservers appear to be down by sajal83 on Thursday July 02, 2015 @09:56AM (#9818860)
(monitoring tool author here) Agree. Makes sense. We should have run this test with RD bit unset.

But .. IIRC if RD is set when quering a non-recursive, it should respond normally with authoritative response Recursion Available (RA) flag unset. It does not mean it should drop the query totally.

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Re:5 out of 7 .io nameservers appear to be down by jamiesonbecker on Thursday July 02, 2015 @02:06PM (#9820551)
Dropping bad queries is often a DDoS countermeasure.
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