[SHAME] Spam Rats

Karl Auer kauer at biplane.com.au
Fri Jan 11 00:27:09 UTC 2013


On Thu, 2013-01-10 at 20:23 +0530, Suresh Ramasubramanian wrote:
> Unused space generally gets a $generate type generic scripted runs which
> could be whatever, like  ip-ad-dr-ess.example.com

Nothing that actually stores actual RRs will scale to the number of
addresses available in IPv6.

If you want a PTR for every possible address in your network, or even
just every possible address in a single /64 subnet then you are SOL as
far as IPv6 is concerned. The only way to do it is to fake it - for
example by synthesising responses on the fly. You can't cache the
synthesised responses either, that would be inviting a DoS.

I said this would be "pointless" because if providing RRs were as simple
as synthesising one on request, then the presence of a PTR record would
no longer be a meaningful indicator of cluefulness (not that it is now
IMHO, but opinions clearly differ on that).

> As for v6 how popular do you see it getting for mail?

Well - at least as popular as IPv4 - eventually :-)

Regards, K.


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Karl Auer (kauer at biplane.com.au)
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