direct queries of reverse zone, [not] using CNAME hack

[Matus UHLAR - fantomas]

On 27.08.08 11:25, Justin Pryzby wrote:
> We have CIDR/29 reverse DNS delegated to us using the CNAME hack:
> 
> > 109.216.80.206.in-addr.arpa is an alias for 109.104-111.216.80.206.in-addr.arpa.
> > 109.104-111.216.80.206.in-addr.arpa domain name pointer athena.norchemlab.com.
> 
> Every day we get a few queries to our published nameservers not for the
> 109.104-111.216... record, but for the 109.216...directly.
[...]
> Is that due to some broken nameservers that can't handle the CNAME or a PTR
> with 6 components, a probe, or ??

looking at that record, you seem to redirect those records to the domain
104-111.216.80.206.in-addr.arpa. that is not visible from the net. At least
authoritative nameservers for 216.80.206.in-addr.arpa. do not know anything
about that domain. That delegation is broken. You must configure NS records
for the 104-111.216.80.206.in-addr.arpa. domain to 216.80.206.in-addr.arpa.
zone for the delegation to work

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