[dns-operations] CNAME points to itself

fujiwara at jprs.co.jp fujiwara at jprs.co.jp
Tue Jul 5 07:51:26 UTC 2016

> From: yhpeng at orange.fr
> 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?

Read RFC 1034 Section 3.6.2. Aliases and canonical names

| domain software should not fail when presented with CNAME
| chains or loops; CNAME chains should be followed and CNAME loops
| signalled as an error.

Kazunori Fujiwara, JPRS <fujiwara at jprs.co.jp>

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