[174522] in North American Network Operators' Group
Re: Bare TLD resolutions
daemon@ATHENA.MIT.EDU (Doug Barton)
Wed Sep 17 17:56:14 2014
X-Original-To: nanog@nanog.org
Date: Wed, 17 Sep 2014 14:51:15 -0700
From: Doug Barton <dougb@dougbarton.us>
To: nanog@nanog.org
In-Reply-To: <4331947.2044.1410990538588.JavaMail.root@benjamin.baylink.com>
Errors-To: nanog-bounces@nanog.org
On 9/17/14 2:48 PM, Jay Ashworth wrote:
> ----- Original Message -----
>> From: "Andrew Sullivan" <asullivan@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
