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Keith Moore [mailto:[EMAIL PROTECTED] wrote:
> > "But mommy, if the geeks don't use it, they probably don't
> > want to rely on it either, so why should I ?"
>
> I rely on IPv6 every single day, and I think I qualify as a
> geek. That doesn't mean I think it's a good idea to fragment
> the IPv4-based email or web infrastructures.
With fragmenting you imply IPv6 only ? That is not an option
ofcourse, all the work for transition wasn't done for nothing,
a mailserver can be dualstacked to serve both IPv6 capable and
IPv4 capable clients, even as a fallback. Putting the lists on
IPv6 only is a nogo, not now and not in ten years probably.
But having it available and using it per default over IPv6
is a good thing. If something is wrong in the path, users will
complain and as this is a list full of techs it will be fixed
too in a short amount of time. For smtp it is even better
as MX's can have fallbacks anyways:
example.net MX 10 mx.example.net
MX 20 mx.ipv4.example.net
mx.example.net AAAA 2001:db8::1
A 10.0.0.1
mx.ipv6.example.net AAAA 2001:db8::1
mx.ipv4.example.net A 10.0.0.1
This way there really is no way that the host can be missed
even if a AAAA in the DNS would confuse a smtp daemon, though
there are afaik no cases of that. If there where they would
simply need to fix these problems on their side.
A good example of something which was discovered merely by
plain usage was the broken DNS implementations that returned
NODATA when requesting an AAAA for a host but when they'd
actually did have a A for that hostname.
Usage is a good thing IMHO and if possible, make it so.
Greets,
Jeroen
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