PTR records for IPv6

[Lorenzo Colitti]

On Mon, Sep 2, 2013 at 10:05 AM, Jason Fesler <jfesler at gigo.com> wrote:

> On Sun, Sep 1, 2013 at 5:30 PM, Lorenzo Colitti <lorenzo at google.com>
> wrote:
> > What's wrong with wildcard PTRs?
> >
> > *.e.f.a.c.8.b.d.0.1.0.0.2 IN PTR customer-cafe.isp.net.
>
> And, customer-café.isp.net <http://xn--customer-caf-meb.isp.net> has AAAA
> records to what exactly?
>
> It isn't just reverse DNS.  It is reverse + matching forward DNS.
> Mismatches in the IPv4 world are greatly penalized both at SMTP time
> and by SpamAssassin.
>

To 2001:db8:cafe::. Then we can modify SMTP servers and spam systems to
look at only the first 64 bits and we sort of have parity to what we have
today.

Of course, if people put multiple customers on the same /64 then those
customers can influence each other's reputations. But this is no different
to what happens today to customers on the same public IPv4 address (e.g.,
shared hosting, SMTP relay).
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.cluenet.de/pipermail/ipv6-ops/attachments/20130902/56852d9a/attachment.htm>