Re: DNSBL and IPv6

Hi John,

I'd like to help. Let me know what I can do.


On Sat, Oct 20, 2012 at 5:40 PM, John Levine <[email protected]> wrote:

> >The only relevant difference between v4 and v6 DNS based blacklisting is
> >that the ability to easily hop around *within* your /64 makes it
> >possible (easy) to blow the cache of a traditional caching DNS resolver
> >if you do naive "look up a record based on the IPv6 address".
>
> That's always been our assumption, but there is at this point precious
> little evidence that MTAs that query DNSBL through caches (as opposed
> to those who have a local rsync mirror) have a cache hit rate much
> greater than zero.  If in fact they don't, the same design, perhaps
> with a little TTL tuning to give clients a hint about which ones are
> worth caching, could work no worse than they do now for similar mail
> volumes.
>
> That's why I want to do the cache simulations, to figure out what's
> going on now.  It shouldn't be terribly hard, and we have people
> offering data.  Want to help?
>
> R's,
> John
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>



-- 
Jeff Macdonald
Ayer, MA

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