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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 10:03 UTC

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Date: Mon, 22 Sep 2014 11:03:37 +0100
From: Tony Finch <dot@dotat.at>
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References: <20140921115222.GB16178@xs.powerdns.com> <541F1AE8.6010709@redbarn.org>
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Subject: Re: [DNSOP] fyi [Pdns-users] Please test: ALIAS/ANAME apex record in PowerDNS
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I can see roughly three ways this might be done, in order of increasing
complexity...

(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.

(2) Authority-only: All authority servers recognize ANAME records,
PowerDNS style.

Disadvantage: all authority servers need DNSSEC private keys.

(3) DNAME-style: Authority servers and resolvers recognize ANAME records.
ANAME-aware servers (auth and rec) return the synthesized records for
backwards compatibility, without signatures. For DNSSEC purposes the
signed ANAME goes in the answer section and the original signed target
goes in the additional section.

Disadvantages: forklift upgrade; DNSSEC codepoint rollover.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
Trafalgar: Cyclonic in northwest, otherwise mainly northerly or northwesterly
5 or 6. Slight or moderate. Showers in northwest. Good.

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