On Jul 18, 2013, at 1:18 PM, John Miller <johnm...@brandeis.edu> wrote:
> I know that for the following record in example.com's zone file:
> 
> host.example.com.  IN CNAME otherhost
> 
> BIND will return:
> 
> host.example.com. <TTL> IN CNAME otherhost.example.com.

Assuming $ORIGIN is set to example.com, but yes.

> Is this behavior required anywhere in the RFCs, or would
> 
> host.example.com. <TTL> IN CNAME otherhost.
> 
> be equally valid from an RFC perspective?  Obviously this would also pertain 
> to NS, MX, SRV, PTR, etc. records.

"otherhost." is equally valid from an RFC perspective, or 
"otherhost.other.domain."  If there is a trailing dot, the CNAME target is 
assumed to be fully qualified, otherwise $ORIGIN is appended just as it would 
be for any other record using an unqualified name.

Regards,
-- 
-Chuck

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