Questions about DNAME records

[Michael Milligan]

Chris Buxton wrote:
> On Jun 15, 2009, at 2:37 AM, Braebaum, Neil wrote:
> Now, ignoring that invalid "www" record, the zone above has an apex
> (example.com itself) and then essentially infinite ghostly children. Any
> valid query that lands in that domain (i.e. the qname ends in
> example.com) but is not for example.com itself will be answered by a
> synthetic CNAME record, like this:
> 
> qname.example.com.    CNAME    qname.example2.com.
> 
> If that alias points to a valid name in example2.com, then the query is
> answered positively. If it points to a CNAME record in the example2.com
> domain, then you have a CNAME chain (an alias of an alias of a third,
> referenced name), which then causes resolution to continue with the
> referenced name. (Is this what you meant by "forwarding"?)

Don't forget that the DNAME record is also included in the answer as
well as the synthesized CNAME record(s).  I say records since DNAME
chains are possible here too (though not recommended of course).

Regards,
Mike

-- 
Michael Milligan                                   -> milli at acmeps.com