Point domain name of my zone to name in somebody else's zone?

Tony Finch dot at dotat.at
Thu May 8 09:40:57 UTC 2014

Dave Warren <davew at hireahit.com> wrote:
> DNSMadeEasy calls this an "ANAME" record, internally they just lookup the
> destination's IP and cache it, updating it as needed.
> It works, but it would be nice if this could be done in DNS. Sadly, it can't,
> and probably won't in our lifetimes.

Never say never :-)

You can implement something ANAME-alike with a script that polls the
A and AAAA records at the target name and does a DNS UPDATE on the owner
as necessary, but that might not scale too well.

There are a couple of difficulties with implementing ANAME inside the

Firstly it implies a weird authoritative/recursive hybrid. A bit ugly but
not unreasonable.

Secondly, and more importantly, is the question of how this works with
zone transfers and secondaries. How do you ensure they support ANAME
records? Do you include a backwards compatibility hack by adding the A and
AAAA records to the zone?

f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Thames, Dover, Wight, Portland, Plymouth: Southwest 5 to 7, occasionally gale
8 in Thames, Dover and Wight. Moderate or rough. Rain or showers. Moderate or
good, occasionally poor at first.

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