Dumb Question is an A or AAAA record required?

Mark Andrews marka at isc.org
Thu Jul 9 19:32:59 UTC 2020

Very soon you will be able to specify HTTPS records. BIND has a implementation that is just waiting for the draft to go to the RFC editor. The type codes are already allocated. 

This still requires clients to lookup the records but the browser vendors are on board. 

Mark Andrews

> On 10 Jul 2020, at 02:03, Matthew Richardson <matthew-l at itconsult.co.uk> wrote:
> My question is raised because of such "poor decisions" by certain web
> hosting providers (naming no names!) whose provisioning systems require
> records for both www and the domain root pointing to their systems, and
> where those systems DO LISTEN on port 25.
> In these modern days, should one be concerned about this for a domain where
> the MX records point to proper enterprise grade email services?  The
> problem is that the web hosting provider's poor decision might interfere
> with the enterprise email system.
> I think Matus may be correct that this is only an issue if the MX query
> returns NODATA rather than timing out.  In the old days (10-15 years ago),
> I think a timeout may have triggered the failback from MX to A, but I am
> not sure.
> Best wishes,
> Matthew
> ------
>> From: Anand Buddhdev <anandb at ripe.net>
>> To: Matthew Richardson <matthew-l at itconsult.co.uk>, bind-users <bind-users at lists.isc.org>
>> Cc:
>> Date: Thu, 9 Jul 2020 17:06:13 +0200
>> Subject: Re: Dumb Question is an A or AAAA record required?
>>> On 09/07/2020 16:06, Matthew Richardson wrote:
>>> On a related issues there were (perhaps long ago) issues if the A record
>>> for a domain had an SMTP server on it, where email could sometimes be
>>> delivered to that A record rather than the MX.  I had (again long ago:
>>> 10-15 years) actually seen this occur.
>> Note that *delivery* will only happen if that A record were actually
>> listening on tcp/25 and accepting SMTP connections. No-one should be
>> opening up the SMTP port on a server meant to serve only HTTP(S)
>> traffic. Anyone who does that deserves what they get for making such
>> poor decisions.
>> Anand
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