Re: [DNSOP] New draft for ALIAS/ANAME type

Bryan Hughes <bhughes@tiggee.com> Fri, 07 April 2017 16:12 UTC

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References: <20170330230806.6273.qmail@ary.lan> <9232F4F4-772F-48AA-80FB-C990662AFD7A@powerdns.com> <alpine.DEB.2.11.1704031253200.13590@grey.csi.cam.ac.uk> <CAAiTEH91_jo2p2kEhtzc=B2KSnqZQ9XLAVsY2TYbh7DTcCcD4Q@mail.gmail.com> <alpine.DEB.2.11.1704041815020.13590@grey.csi.cam.ac.uk> <CAAiTEH8ik1gKkzcJxMWQVMKssQyJUf1aV-Awpuhh2YReadL2vw@mail.gmail.com> <887fdc84-cefa-97f4-3e93-c013cfea9fe7@nic.cz>
From: Bryan Hughes <bhughes@tiggee.com>
Date: Fri, 7 Apr 2017 12:12:39 -0400
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To: =?UTF-8?B?UGV0ciDFoHBhxI1law==?= <petr.spacek@nic.cz>
Cc: Matthew Pounsett <matt@conundrum.com>, Tony Finch <dot@dotat.at>, dnsop <dnsop@ietf.org>, Peter van Dijk <peter.van.dijk@powerdns.com>
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Subject: Re: [DNSOP] New draft for ALIAS/ANAME type
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In many cases, DNS Made Easy is seeing ANAME records requiring synthesized
A record updates every 90 seconds or so. Also, it is surprising to me that
our non-apex ANAME record count has surpassed apex ANAME record count by a
significant amount. We have approximately 25% fewer apex ANAME records than
non-apex, however apex ANAME records account for over 75% of ANAME zone
update activity. We currently process around 50,000 distinct ANAME records
and we are seeing an average of 60, max of 925, and min of 0 zone updates
per zone per day with an average of 1.74 synthesized A records per non-apex
ANAME record and 1.41 synthesized A records per apex ANAME record.


On Fri, Apr 7, 2017 at 2:44 AM, Petr Špaček <petr.spacek@nic.cz> wrote:

> On 4.4.2017 19:30, Matthew Pounsett wrote:
> > On 4 April 2017 at 13:21, Tony Finch <dot@dotat.at
> > <mailto:dot@dotat.at>> wrote:
> >
> >     > I believe that's a faulty assumption.   Here's some data:
> >     >
> >     > [...] During the month of February, [...] an average of 31 changes
> >     per zone. [...]
> >
> >     That seems to agree with what I meant, though I probably should have
> >     said
> >     "per-zone" somewhere :-)
> >
> > That's the average, but there's a not-insignificant number there being
> > updated many times per day.    Most of the time, you're right, there are
> > few changes, but one can't assume that any given alias will have a low
> > rate of change.
>
> Numbers, that really helps!
>
> If I consider the numbers above and the fact that IXFR is able to deal
> even dynamically updated zones, I conclude that pushing ANAME logic to
> provisioner side is reasonable approach and that added complexity in
> name server itself is not warranted.
>
> --
> Petr Špaček  @  CZ.NIC
>
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