Karl, We have a knowledgebase article on the topic of ‘alias’ records: https://kb.isc.org/docs/aa-01640. The article is a bit out of date, but still basically valid. It is not specific to the implementation you mention however.
Vicky > On Mar 26, 2024, at 7:49 AM, Karl Auer <ka...@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"? > > It seems to be a non-standard extension that some DNS providers > support. It seems to work similarly to, but not quite the same way as, > a CNAME. Its big advantage over a CNAME is that it can coexist with > other records of the same name (LHS). However, it seems to be non- > standard. > > - when you look up the LHS, you do not get the ALIAS RHS back > > - it seems to internally look up the RHS, and return those results > > - if you make an A query, you get any matching A records back, as well > as the results from any ALIAS records with the same LHS > > - the TTLs of records obtained via the ALIAS are inherited from the TTL > of the ALIAS record > > - the real TTLS of the A records behind the ALIAS are lost. This seems > to be risky > > Same providers say it is faster to resolve than a CNAME; I can't see > why that would be. > > Regards, K. > > -- > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Karl Auer (ka...@biplane.com.au, he/him) > http://www.biplane.com.au/kauer > > > -- > Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from > this list > > ISC funds the development of this software with paid support subscriptions. > Contact us at https://www.isc.org/contact/ for more information. > > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users
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