On 2012-02-28 12:27 AM, Edward Lewis wrote:
> At 13:35 -0500 2/27/12, Hector Santos wrote:
>> If it doesn't already exist or not considered in the past as an
>> unfeasible concept, I am interest in seeing if this is something
>> worth pursuing.
>
> One (not the only, Ohta replied with another) of the oft-cited
> obstacles is the presence of only one RCODE field in the packet. (What
> if one query would be NXDOMAIN and the other has an answer?)
>

indeed, this is why multiple queries were not supported in the original
DNS, and it's why EDNS doesn't have it either. the number of signalling
bits needed to explain what went on with the multiple queries made
folks' heads explode. the logic is still online if you want to see it:
<http://nsa.vix.com/~vixie/edns1.txt>.

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