Anybody behind a NAT64?

[Dan Wing]

> -----Original Message-----
> From: ipv6-ops-bounces+dwing=cisco.com at lists.cluenet.de [mailto:ipv6-
> ops-bounces+dwing=cisco.com at lists.cluenet.de] On Behalf Of Daniel Roesen
> Sent: Thursday, December 06, 2012 3:00 PM
> To: ipv6-ops at lists.cluenet.de
> Subject: Re: Anybody behind a NAT64?
> 
> On Tue, Dec 04, 2012 at 11:21:14PM +0100, Tore Anderson wrote:
> > Yes, my mobile provider Mobile Norway has an IPv6-capable APN. It's
> > not IPv6-only though, as it supports both IPv4 and IPv6 PDP contexts,
> > but not dual-stack IPv4v6 ones yet. The IPv6 PDP context comes with
> > NAT64/DNS64 service, but I can also use IPv4 and IPv6 PDP contexts in
> > parallel to get true dual-stack connectivity if the equipment supports
> > it.
> 
> True dual-stack using DNS64? :) What DNS recursors do mobile handsets
> use when both IPv4 and IPv6 PDP contexts do get established (or IPv4v6
> for that matter)?
> 
> As far as I can see, properly supporting IPv6-only clients via
> NAT64+DNS64 in the same... uhm... "network segment" is still an unsolved
> problem.

Yes, it's unsolved.
http://tools.ietf.org/html/draft-wing-behave-dns64-config
enumerates a bunch of solutions, none of which is works as well as
necessary.

> Still didn't find time (and motivation) to write up my approach
> of using an EDNS "DNS64 desired" flag signalling. :)

That idea one is not in the above Internet Draft.  If I get the energy,
I'll edit the document and include your idea.  I think your idea has some
good properties.

(for background, I was originally trying to find a way to accomplish the
goal of both dual-stack and IPv6-only hosts on the same network without
changing either host.  I think that can't be made to work, so we have to
look at changing the legacy (dual-stack) hosts or the new (IPv6-only)
hosts.  Changing the legacy is effectively impossible.  Changing the 
IPv6-only hosts is still within the realm of possible.)

-d

> Best regards,
> Daniel
> 
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