Re: [v6ops] I-D Action: draft-ietf-v6ops-nat64-experience-04.txt

["Heatley, Nick" <[e-mail]>]

Agree, the questions seem only relevant to the mobile use case (with a normal baseline of IPv4 privates + NAT44).
Hopefully you can see that the questions are valid now.
I seek arguments why, in an access network dominated by NAT why to prefer one flavour over another? - other than pushing my NAT vendor to achieve parity NAT64 <--> NAT44 (they claim both translations are in hardware). If NAT64 is good enough for IPv6-only clients its good enough for Dual Stack NAT?
Nick


-----Original Message-----
From: [e-mail] [mailto:[e-mail]] On Behalf Of Gert Doering
Sent: 09 November 2013 13:26
To: Mikael Abrahamsson
Cc: [e-mail]
Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-nat64-experience-04.txt

Hi,

On Sat, Nov 09, 2013 at 09:27:32AM +0100, Mikael Abrahamsson wrote:
> On Fri, 8 Nov 2013, Gert Doering wrote:
> 
> > If you have NAT44 and native IPv6, I can't see why you would want to 
> > add
> > DNS64+NAT64 to the mix.
> >
> > NAT64 is good when you do *not* want IPv4 at the customer edge.
> 
> Mobile. You don't know if the client is v4 only, v6 only, or dual stack. 
> This is up to the client.

Understood, and I see your issue here - you would want to announce a "normal" DNS server to a dual-stack client, not a DNS64 server, and you can't do that because you don't know whether he's v6 only or dual-stack.

This is somewhat easier in other types of large-scale customer deployments, where you can control what the client can get - which will mostly be something like "NAT44+IPv6" for many subscribers for the time to come, so adding DNS64/NAT64 really does not have much benefit here.

Gert Doering
        -- NetMaster
--
have you enabled IPv6 on something today...?

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