[Nanog] Re: IPv6 rDNS - how will it be done?

Richard Barnes richard.barnes at gmail.com
Tue Apr 27 20:25:13 CDT 2010


<off-topic>
<IANADBExpert>

Interesting theory, but seems kind of wrong.  Wouldn't the time to
look up or fail be tied to the complexity of how the key space is
populated?  In any case, it seems like the time to succeed or fail
will usually be about the same, since you'll try to access the value
for a key and either find something there or fail.


On Tue, Apr 27, 2010 at 9:19 PM, Larry Sheldon <LarrySheldon at cox.net> wrote:
> On 4/27/2010 19:50, Richard Barnes wrote:
>> Naďve question: If you used macro expansion, wouldn't you end up
>> providing responses for a lot of addresses that aren't in use?  Maybe
>> that's not a problem?
>
> If you get a request, you will have to respond in any case.
>
> I have a theory about data-base lookups--finding something is always
> faster than not finding anything, unless you are using a human brain.
>
> (A human brain can respond "I don't know that" without an inventory of
> everything it does know.)
>
> (That may be to only truly unique thing about humans.  And no, I have
> not kept up with neural networks work.)
>
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