Re: New Version Notification for draft-koodli-ipv6-in-mobile-networks-02

[Fred Baker <fred@cisco.com>]

As I said, the IETF's recommendation makes no suggestion that one even think about one's IPv4 implementation. It says "turn on IPv6 in your existing IPv4 network". If your existing IPv4 network is using IPv4/IPv6 translation to convert the edge network's IPv4 to the core network's IPv6, I would guess that means "use IPv4/IPv6 translation". Somehow, I don't think that's a common model.

I'll refer you to http://tools.ietf.org/html/draft-arkko-ipv6-transition-guidelines
  "Guidelines for Using IPv6 Transition Mechanisms", Jari Arkko, Fred
  Baker, 24-Feb-10

While it is not itself a consensus document (I'd like to make it one, but that's another discussion), I believe that it represents the current IETF consensus. In the discussion in section 4, you'll find that IPv4/IPv6 translation mentioned but is not pushed. Says one of the co-authors of the IPv4/IPv6 translation approach.




On Apr 16, 2010, at 10:44 AM, Simon Perreault wrote:

> On 2010-04-16 13:28, Fred Baker wrote:
>> I don't think that RFC 4213 says anything about NATs pro or con; a
>> quick scan of the document didn't find the character string "NAT" or
>> "[nN]etwork [aA]ddress" anywhere in it. What it says could be
>> summarized as "turn on IPv6 in your existing IPv4 network", without
>> making much comment on the IPv4 network. In today's world, any IPv4
>> network that interfaces with edge networks, which is to say the edge
>> networks themselves or the ISPs they talk with, will find a NAT
>> somewhere in the discussion.
> 
> Exactly my point. RFC 4213 doesn't consider NATs.
> 
>> In other words, I disagree that the the statement has anything to do
>> with the IPv4 implementation whatsoever. It says to turn on IPv6
>> without changing your IPv4 implementation.
> 
> If an ISP wants to go from providing NAT44 to providing IPv6+NAT64, would that go against the IETF's dual-stack recommendation? It sure seems like it since it involves completely shutting down IPv4.
> 
> Thanks,
> Simon
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