--On 29 August 2008 16:10:39 +0000 Paul Vixie wrote:

>> - how do we identify those without doing every (final) query twice?

>
> we don't. that's the cost.
>
>> That appears to mean twice as many queries to the real authoritative
>> servers, for every QNAME, since it's perfectly possible for
>> foo.example.com to have a different final delegation chain to
>> www.example.com.

>
> once per new QNAME per RDNS per TTL. this is a lower number than you'd
> think.


If combined with 0x20, could one only make the additional query if
(i) the original qname's case was not preserved or (ii) the qname
did not itself contain sufficient entropy (e.g. ".", "com." etc.)?

Alex

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