bind-9.7.2 not forward CNAMEDed domain names

Florian Weimer fweimer at
Tue Feb 22 09:58:12 UTC 2011

* Drunkard Zhang:

> 2011/2/22 Florian Weimer <fweimer at>:
>> * Drunkard Zhang:
>>> The upstream DNS server did responsed correctly, by
>>> analysis via tcpdump.  But why bind didn't use THE RESPONSE, but
>>> resolves again from root-servers.
>> Unfortunately, the information provided by must be
>> discarded because that is server is not authoritative for
>> From your resolver's perspective, it is a totally unrelated domain
>> name.
> Thanks! So bind can accept second hand answer, but won't accept third
> hand (or more) answer?

It shouldn't accept the second CNAME, either.  Are you sure that it
does?  It's probably the same globally, so it's not visible from the
cache contents.

Florian Weimer                <fweimer at>
BFK edv-consulting GmbH
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99

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