Bare TLD resolutions

Doug Barton dougb at dougbarton.us
Wed Sep 17 21:51:15 UTC 2014


On 9/17/14 2:48 PM, Jay Ashworth wrote:
> ----- Original Message -----
>> From: "Andrew Sullivan" <asullivan at dyn.com>
>
>> On Wed, Sep 17, 2014 at 04:57:52PM -0400, Jay Ashworth wrote:
>>> ----- Original Message -----
>>> No, I was confusing you for someone who understood -- as everyone else
>>> here seems to have -- that I meant "querying for an A, AAAA, or MX record".
>>
>> You want to return NXDOMAIN for a name only when the QTYPE is A, AAAA,
>> or MX, and not everything else? Presumably you don't want to do
>> negative caching?
>
> I want to return NXDOMAIN *because there is no record of that type at that
> node*.
>
> That was the underlying point here; I thought that was pretty clear.

But that's not what NXDOMAIN means. :)  You get an NXDOMAIN response 
when there is no label at that point in the tree, period. In the case 
you specify you get the combination of NOANSWER + NOERROR if there is no 
address record, but there are other records (like there are at a zone 
apex).

hth,

Doug




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