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Re: [DNSOP] fyi [Pdns-users] Please test: ALIAS/ANAME apex record in PowerDNS

Tony Finch <dot@dotat.at> Mon, 22 September 2014 11:27 UTC

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Date: Mon, 22 Sep 2014 12:27:33 +0100
From: Tony Finch <dot@dotat.at>
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To: Dick Franks <rwfranks@acm.org>
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References: <20140921115222.GB16178@xs.powerdns.com> <541F1AE8.6010709@redbarn.org> <alpine.LSU.2.00.1409221047520.3000@hermes-1.csi.cam.ac.uk> <CAKW6Ri7HYB0BdHGJG9aTXs3=JP4wG1B5uZpk7Y0S60XGAXayQw@mail.gmail.com>
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Subject: Re: [DNSOP] fyi [Pdns-users] Please test: ALIAS/ANAME apex record in PowerDNS
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Dick Franks <rwfranks@acm.org> wrote:
> On 22 September 2014 11:03, Tony Finch <dot@dotat.at> wrote:
> >
> > (1) Master-only. The master observes an ANAME record at the apex of a zone
> > it loads and uses it to periodically refresh the relevant records in the
> > zone (as if you had a cron job running dig | magic | nsupdate).
> >
> > Disadvantage: potentially lots of XFR traffic if the TTLs are low.
>
> Why would TTL be relevant here?
>
> Is the master not acting as a "partial slave" for the target RRs?
> In which case, the timing should depend on the SOA refresh period.

Yes, you could do it that way. But a lot of people want changes to take
effect quickly.

And I forgot to cover the effects that client-subnet might have ...

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
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