[dns-operations] CNAME points to itself

[Paul Vixie]

"CNAME chains should be followed and CNAME loops signalled as an error." 
(RFC 1034, page 15).

that signaling is done at follow-time, which is not in the authority server.

re:

Stephane Bortzmeyer wrote:
> On Tue, Jul 05, 2016 at 02:48:20PM +0800,
>   yhpeng at orange.fr<yhpeng at orange.fr>  wrote
>   a message of 16 lines which said:
>
>> I have found that CNAME can be setup to point to itself (at least in BIND9
>> it can be).
>>
>> www.itest.com.          300     IN      CNAME   www.itest.com.
>>
>> should this be disabled?
>
> It wouldn't help, a rogue DNS zone operator could always run a
> modified version (or simply another server) allowing this. A DNS
> resolver MUST defend itself against the possibility of infinite
> recursion
> <https://indico.dns-oarc.net/event/21/contribution/11/material/slides/0.pdf>
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-- 
P Vixie