[dns-operations] Karl Auerbach on adding 'millions' more TLD - what do folks think about the operational impact?

Florian Weimer fw at deneb.enyo.de
Wed Jan 10 10:07:59 UTC 2007

* Mark Andrews:

> 	Well they can't *serve* DNAME then.  That doesn't stop the
> 	root server using them or them handling responses that contain
> 	them as they will have the CNAME.

But is proper CNAME handling universally deployed?

Under these second class citizen TLDs, you cannot run name server or
mail servers.  RFC 1123 requires that email addresses are rewritten by
MTAs to resolve CNAMEs (the RFC seems to suggest to do this only for
the envelope, but at least one implementation does it in the header,
too).  So what remains is basically web traffic, SIP, and a lot of
protocols not exposed to end users which do not care about names at

If it's just about web traffic, a client-based approach ("TLDA") seems
possible.  And we've already got several of them. 8-P

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