<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Karl,<div><br></div><div>We have a knowledgebase article on the topic of ‘alias’ records: <a href="https://kb.isc.org/docs/aa-01640">https://kb.isc.org/docs/aa-01640</a>. The article is a bit out of date, but still basically valid. It is not specific to the implementation you mention however. </div><div><br></div><div>Vicky<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Mar 26, 2024, at 7:49 AM, Karl Auer <kauer@biplane.com.au> wrote:</div><br class="Apple-interchange-newline"><div><div>I'm puzzled by the ClouDNS "ALIAS" record. I was wondering if anyone<br>knows how it is handled "under the hood"?<br><br>It seems to be a non-standard extension that some DNS providers<br>support. It seems to work similarly to, but not quite the same way as,<br>a CNAME. Its big advantage over a CNAME is that it can coexist with<br>other records of the same name (LHS). However, it seems to be non-<br>standard.<br><br>- when you look up the LHS, you do not get the ALIAS RHS back<br><br>- it seems to internally look up the RHS, and return those results<br><br>- if you make an A query, you get any matching A records back, as well<br>as the results from any ALIAS records with the same LHS<br><br>- the TTLs of records obtained via the ALIAS are inherited from the TTL<br>of the ALIAS record<br><br>- the real TTLS of the A records behind the ALIAS are lost. This seems<br>to be risky<br><br>Same providers say it is faster to resolve than a CNAME; I can't see<br>why that would be.<br><br>Regards, K.<br><br>-- <br>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>Karl Auer (kauer@biplane.com.au, he/him)<br>http://www.biplane.com.au/kauer<br><br><br>-- <br>Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list<br><br>ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.<br><br><br>bind-users mailing list<br>bind-users@lists.isc.org<br>https://lists.isc.org/mailman/listinfo/bind-users<br></div></div></blockquote></div><br></div></body></html>