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Hm, you know, it's not handled and AGH will simply respond with what it gets first. I'd be grateful if you file a bug report with some information on how to reproduce this (we'll need some domain that always returns SERVFAIL, this is not the case with Google and .biz right now). |
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I've got no idea how to find a domain that always returns a SERVFAIL, however, the response in AGH could probably be checked for that? |
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As you've probably noticed by now, google's DNS (8.8.8.8/8.8.4.4) has problems resolving .biz domains.
I had to turn on "Parallel requests" - and got a proper response from CF's name server (which is the 2nd in the list).
The questions is - what happens if google's DNS (or any other for that matter) answers first with SERVFAIL? Will the other DNS servers responses also be considered? If this is already handled properly - good, but if its not, it's something that should.
This is what happens at the moment trying to get a response from google on a .biz domain:
nslookup my.biz 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
** server can't find my.biz: SERVFAIL
nslookup my.biz 1.1.1.1
Server: 1.1.1.1
Address: 1.1.1.1#53
Non-authoritative answer:
Name: my.biz
Address: 72.167.241.46
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