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if the same IP is asking the same qname over and over, then you might
want to look into DNS RRL, which was originally a BIND thing but which
all open source name servers now possess in some form. it was crafted
for authority (really, root and TLD) servers, but does also work for
recursives.
http://www.redbarn.org/dns/ratelimits
(i guess i'll go fix the https version of that service, again.)
vixie
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