Can an NS point to a CNAME
Matus UHLAR - fantomas
uhlar at fantomas.sk
Thu Aug 12 11:32:32 UTC 2010
On 12.08.10 12:02, Phil Mayers wrote:
> We've had a report this morning that a user can't resolve:
>
> 71.225.219.134.in-addr.arpa PTR
>
> ...I think this is because the parent zone NS records point to CNAMEs. I
> can see references to (much) older versions of bind not following such
> delegations, but I'm not getting anything logged at the nameserver.
I don't know if it's older versions of BIND, but yes, the delegation for
219.134.in-addr.arpa. is broken:
% dig any 219.134.in-addr.arpa @w.arin.net.
[...]
;; AUTHORITY SECTION:
219.134.in-addr.arpa. 86400 IN NS dns1.rhbnc.ac.uk.
219.134.in-addr.arpa. 86400 IN NS dns0.rhbnc.ac.uk.
% dig any 219.134.in-addr.arpa @dns0.rhbnc.ac.uk.
[...]
;; ANSWER SECTION:
219.134.in-addr.arpa. 86400 IN SOA auth1.dns.rhul.ac.uk.
hostmaster.rhul.ac.uk. 2010081101 14400 1800 1209600 86400
219.134.in-addr.arpa. 86400 IN NS dns3.rhul.ac.uk.
219.134.in-addr.arpa. 86400 IN NS dns2.rhul.ac.uk.
;; ADDITIONAL SECTION:
dns2.rhul.ac.uk. 86400 IN A 134.219.101.211
dns3.rhul.ac.uk. 86400 IN A 134.219.101.212
...
dns0.rhbnc.ac.uk. 86400 IN CNAME dns2.rhul.ac.uk.
dns1.rhbnc.ac.uk. 86400 IN CNAME dns3.rhul.ac.uk.
> Is this still the case (that NS->CNAME is invalid)?
yes.
--
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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