AW: [OFF-TOPIC] Question about ClouDNS (and others') ALIAS records

[Klaus Darilion]

> -----Ursprüngliche Nachricht-----
> Von: bind-users <bind-users-bounces at lists.isc.org> Im Auftrag von Jan
> Schaumann via bind-users
> Gesendet: Dienstag, 26. März 2024 14:44
> An: bind-users at lists.isc.org
> Betreff: Re: [OFF-TOPIC] Question about ClouDNS (and others') ALIAS records
> 
> Karl Auer <kauer at biplane.com.au> wrote:
> > I'm puzzled by the ClouDNS "ALIAS" record. I was wondering if anyone
> > knows how it is handled "under the hood"?
> 
> Many DNS service providers have some sort of variation
> of this, since "aliases at the apex" is a feature many
> customers need:
> 
> Akamai uses "Zone apex mapping":
> https://techdocs.akamai.com/edge-dns/docs/features#zone-apex-mapping
> 
> Cloudflare uses "CNAME flattening":
> https://blog.cloudflare.com/introducing-cname-flattening-rfc-compliant-cnames-
> at-a-domains-root/
> 
> AWS uses "alias records":
> https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-
> sets-choosing-alias-non-alias.html
> ...

Some more info can be found in the deprecated draft: https://datatracker.ietf.org/doc/draft-ietf-dnsop-aname/
This is for example very similar how ALIAS is implemented in PowerDNS Auth. But as there is no standard for the "CNAME-like at apex" there is no definition on how TTLs .... should be implemented.

Regards
Klaus