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Re: [v4v6interim] "No DNS changes" indraft-wing-nat-pt-replacement-comparison-01

"Dan Wing" <dwing@cisco.com> Thu, 02 October 2008 05:40 UTC

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From: Dan Wing <dwing@cisco.com>
To: 'Andrew Sullivan' <ajs@commandprompt.com>, v4v6interim@ietf.org
References: <20081001202914.GA34476@commandprompt.com>
Date: Thu, 02 Oct 2008 01:32:24 -0400
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Subject: Re: [v4v6interim] "No DNS changes" indraft-wing-nat-pt-replacement-comparison-01
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> -----Original Message-----
> From: v4v6interim-bounces@ietf.org 
> [mailto:v4v6interim-bounces@ietf.org] On Behalf Of Andrew Sullivan
> Sent: Wednesday, October 01, 2008 4:29 PM
> To: v4v6interim@ietf.org
> Subject: [v4v6interim] "No DNS changes" 
> indraft-wing-nat-pt-replacement-comparison-01
> 
> I think I understand now what my problem was that I was trying to
> state (incompetently, I think) at the mic.
> 
> In the overview of the items we were to discuss this afternoon, and in
> draft-wing-nat-pt-replacement-comparison-01 table 2, we have this
> claim:
> 
>    
> +--------------+-----------------+------------+---------------------+
>    |   Proposal   |  ISP's Internal | DNS Impact |  Carrier 
> Grade NAT  |
>    |              |     Network     |            |            
>          |
>    
> +--------------+-----------------+------------+---------------------+
>    |    A+P-v4    |       IPv4      |  no change |     (no 
> CGN, if     |
>    |              |   destination   |            |   
> subscriber's NAT  |
>    |              |   port routing  |            |   support 
> A+P NAT)  |
>    
> +--------------+-----------------+------------+---------------------+
>    |    A+P-v6    |    IPv4/IPv6    |  no change |     (no 
> CGN, if     |
>    |              |      tunnel     |            |   
> subscriber's NAT  |
>    |              |                 |            |   support 
> A+P NAT)  |
>    
> +--------------+-----------------+------------+---------------------+
> 
> I'm confused by the DNS Impact claim of "no change" here, if the
> suggestion is that A+P is going to help v6-only clients talk to the
> target hosts.  Is it instead the case that A+P is just not going to
> help v6-only hosts?  That is, unless I'm misunderstanding badly (and
> it wouldn't be the first time), a v6-only host can't talk to a v4-only
> host using A+P without getting some way of talking to v4 networks,
> period.  So maybe the DNS Impact in that table should be like NAT444?

A+P is all about IPv4 or a dual-stack host.  In either case, it would
access the IPv4 Internet using IPv4.  Also, in either case, the host does an A
record query and the host can process that A record query.  In that sense, I
agree it is like NAT444.

Table 2 probably tries to say too many things, as Table 2 is about IPv6 hosts
yet Table 2 includes NAT444, which doesn't support IPv6.  A+P (and Dual-Stack
Lite and SAM, for that matter) only support IPv6 subscriber hosts as a
side-effect; they do not intrinsically support IPv6.

-d
 

> A
> 
> -- 
> Andrew Sullivan
> ajs@commandprompt.com
> +1 503 667 4564 x104
> http://www.commandprompt.com/
> _______________________________________________
> v4v6interim mailing list
> v4v6interim@ietf.org
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