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Re: [v6ops] I-D Action: draft-ietf-v6ops-ula-usage-recommendations-02.txt

"Liubing (Leo)" <leo.liubing@huawei.com> Fri, 21 February 2014 08:24 UTC

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From: "Liubing (Leo)" <leo.liubing@huawei.com>
To: David Farmer <farmer@umn.edu>, "v6ops@ietf.org" <v6ops@ietf.org>
Thread-Topic: [v6ops] I-D Action: draft-ietf-v6ops-ula-usage-recommendations-02.txt
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Date: Fri, 21 Feb 2014 08:24:39 +0000
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-ula-usage-recommendations-02.txt
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Hi David,

Thank you for the comment. Please see replies below.

> On 2/20/14, 07:15 , Nick Hilliard wrote:
> > On 20/02/2014 01:17, Lorenzo Colitti wrote:
> >> You assume that people will actually follow the rules instead of
> >> saying "let's just do this like IPv4, and use NAT at the border".
> >
> > people will not just do this: they will assign everything from
> > fd00::/48 and will view NAT as a feature.
> 
> Do we think not talking about ULA will stop people from doing NAT with
> ULA?
> 
> Get over it.  This draft is necessary, we need to tell people how to properly
> use ULA.  It is not telling them to do NAT.  I think it should more strongly
> tell them to NOT do NAT.  However, they are going to do what they are
> going to do.  But, if we don't tell them what the proper use cases for ULA
> are, then our silence is consent for them to go ahead and do NAT with ULA.

[Bing] The WG used to discuss ULA+NPTv6 use case a lot. Some people suggested to clearly state in the draft "NOT recommended to do ULA+NAT"; while some argued "NOT recommended" was too strong, just provide pros/cons and cautions on it. We agreed with the latter one, since we thought ULA+NPTv6 might be a valid use case in some situations. 
However, one of the main goals of this draft is to eliminate the mis-understanding of ULA is supposed to be binding with NAT. This point is clearly described in Section 4. And the ULA+NPTv6 is not listed in the recommended use cases. We thought this is a way to strike the balance.

Best regards,
Bing


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