RE: Last Call: <draft-ietf-behave-lsn-requirements-07.txt> (Common requirements for Carrier Grade NATs (CGNs)) to Best Current Practice

["George, Wes" <[e-mail]>]

> From: Simon Perreault [mailto:[e-mail]]
> Sent: Saturday, July 07, 2012 5:21 PM
>
> Wes,
>
> Here's my take on this...
>
> CGN as defined in this document does not only include NAT444. It is more
> generic than that: it really means "multi-user NAT". Dave Thaler came up
> with the example use case of the NAT in a wifi hotspot. It's just NAT44,
> but it still fits with the draft's definition of CGN because you have
> multiple users potentially fighting for the same NAT resources. Remember
> that the main raison d'être of this draft is for the operator to be able
> to ensure fairness between NAT users. So in this view I think it is
> clearly behave material since the sunsetting of IPv4 really is
> orthogonal to multi-user NATs.
>
> On the question of IPv6: I don't think we should talk about IPv6 simply
> because IPv6 NAT so far has not seen significant deployment in the
> context of multi-user NAT. And NPTv6 is stateless so there are no
> resources to fight for.

[WEG] I agree with all of what you've said, but I think I need to make the point that I'm concerned with clearer, because the above doesn't exactly address it. I wasn't saying anything about IPv6 NAT, or even IPv4 sunset. I was saying that the current wording is unclear as to what you mean by "IPv4-only". While the NAT specified by this document itself may only act on IPv4 traffic, as you note above it's not limited to just NAT444 or even an IPv4-only *network*. The recommendations in this doc will work for an IPv4 NAT associated with DSLite just as easily as a more traditional IPv4 transport. This is an important distinction, IMO.

>
> Back to your email, where you wrote:
>
> > if it is truly a IPv4-only NAT (NAT44 or NAT444) requirements doc
> rather than a more generic CGN requirements doc, it should be named to
> reflect that.
>
> How about "Common Requirements for IPv4 Carrier Grade NATs (CGNs)"?
[WEG] This helps, but only in conjunction with additional clarification about the application - that is, just because the NAT is IPv4-only doesn't mean that the network must also be IPv4-only.

Thanks
Wes George

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