Re: [v4v6interim] Comparison document

> -----Original Message-----
> From: Mikael Lind [mailto:mikael.lind@hexago.com] 
> Sent: Friday, September 19, 2008 2:30 PM
> To: 'Dan Wing'; v4v6interim@ietf.org
> Subject: RE: [v4v6interim] Comparison document
> 
> 3.1.2 describes the two proposals Dual-stack lite and SNAT as 
> more or less
> the same. Even if there is discussion about merging them I 
> still think it
> would be worth pointing out in the document that there is a 
> big difference
> between the two proposals. 
> DS-lite doesn't require a tunnel to be set up in order to 
> function as it
> keeps the IPv6 source address as part of the NAT state, much 
> like a NAT-PT.
> In the case of SNAT there has to exist a tunnel per user 
> before traffic is
> sent as tunnelling and NAT are more or less separate. 

The 3 authors of SNAT and DS-Lite all told me to collapse the
text of their proposals because they are consolidating the two
proposals.

SNAT uses the tunnel identifier to distinguish each subscriber;
DS-Lite uses the IPv6 address to distinguish each subscriber.  
This is a pretty minor distinction in the overall scheme of
things.   In both cases, the concentration endpoint must be
configured (or otherwise learned, e.g., via a DHCP option)
and in both cases the NAT44 function needs to differentiate
each subscriber (such as VLANs, tunnel ID, or IPv6 
interface) so that subscribers can be given overlapping
IPv4 addresses.

-d

> -Mikael
> 
> > -----Original Message-----
> > From: v4v6interim-bounces@ietf.org [mailto:v4v6interim-
> > bounces@ietf.org] On Behalf Of Dan Wing
> > Sent: September 16, 2008 11:45
> > To: v4v6interim@ietf.org
> > Subject: [v4v6interim] Comparison document
> > 
> > We just submitted "A Comparison of Proposals to Replace 
> NAT-PT", which
> > attempts to summarize and compare APB-Revised, Dual-Stack 
> Lite, NAT444,
> > IVI,
> > NAT6, NAT64, NAT-PT, and sNAT-PT.
> > 
> > http://www.ietf.org/internet-drafts/draft-wing-nat-pt-replacement-
> > comparison-0
> > 0.txt
> > 
> > -d
> > 
> > _______________________________________________
> > v4v6interim mailing list
> > v4v6interim@ietf.org
> > https://www.ietf.org/mailman/listinfo/v4v6interim
> 

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