>> I'm hoping the answer is yes, so that once an NXDOMAIN response is >> received by the name server, it will not forward repeated queries for >> that same name, at least for as long as the negative cache TTL. > > Named does that by default. Not all authoritative sources however > provide a cachable negative answer. But that's not what I'm seeing. If a client sends 100 queries for a non-existent name to its nearest name server, all of them are forwarded on up. What I want is for the name server to cache those NXDOMAIN answers so even if a client is slamming my DNS, my server is not in turn hammering those name servers upstream.
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