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Re: [DNSOP] Caching of negative zone (non-authoritative) responses

"Michael J. Sheldon" <msheldon@godaddy.com> Mon, 08 July 2019 18:12 UTC

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From: "Michael J. Sheldon" <msheldon@godaddy.com>
To: Ted Lemon <mellon@fugue.com>
CC: "dnsop@ietf.org" <dnsop@ietf.org>
Thread-Topic: [DNSOP] Caching of negative zone (non-authoritative) responses
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Date: Mon, 08 Jul 2019 18:12:01 +0000
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Subject: Re: [DNSOP] Caching of negative zone (non-authoritative) responses
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On 7/8/19 10:59 AM, Ted Lemon wrote:
> BTW, it would also be perfectly legitimate for an authoritative server
> that doesn’t provide recursion to respond with NXDOMAIN for any query
> within a domain that’s delegated to it, 

But again, since you have no SOA to return, you have no record to attach
a TTL to, so retries, retries, retries.

> Although now that I think about this, another problem we’d face here is
> that DNSSEC would break this completely.   If you have a secure
> delegation, but don’t have the ability to sign the zone, you can’t
> respond authoritatively even if the delegation is pointing at your
> server.   So here the only real fix is at the registrar.

Not gonna argue that the best fix is at the registrar. As an owner of a
nameserver, I really should have the right to say "no, you can't point
that to me."

But there's other reasons for REFUSED as well (security, ddos filtering,
etc) and I should have a means to add to the reply, "don't ask again for
X seconds"

-- 
Michael Sheldon
Dev-DNS Services
GoDaddy.com

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