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When a certain NS gets asked "what's the A of sipfs02.example.com?" it gives back the RR I need. But if I ask first for "the AAAA of sipfs02.example.com", it gives back an NXDOMAIN instead of NOERROR. And then the NXDOMAIN gets cached for the following query.

I'm running bind9. I searched for DNS AAAA and BIND AAAA, but got no interesting results. Got one about patching djbdns to "poison" all NXDOMAINs, but I want to kick only one particular server, not everyone.

Thanks!

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That certain NS is broken and you should notify the DNS admins for that domain that it is. It should be returning NOERROR. –  Mark Wagner Aug 13 '10 at 17:34
    
Yes, I agree! Unfortunately, the DNS admins aren't responsive. Even better, sipfs01.example.com does NOT exhibit this behaviour. This is why I'm planning on poisoning the RR and workaround their bug. –  Luis Bruno Aug 24 '10 at 14:46
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So just block communication with sipfs02.example.com? :> –  al. Oct 11 '10 at 14:31
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