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RE: [Fwd: I-D Action: draft-carpenter-6man-why64-00.txt]

"Templin, Fred L" <Fred.L.Templin@boeing.com> Tue, 07 January 2014 19:55 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Tim Chown <tjc@ecs.soton.ac.uk>, Brian E Carpenter <brian.e.carpenter@gmail.com>
Subject: RE: [Fwd: I-D Action: draft-carpenter-6man-why64-00.txt]
Thread-Topic: [Fwd: I-D Action: draft-carpenter-6man-why64-00.txt]
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Date: Tue, 07 Jan 2014 19:54:42 +0000
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Cc: Alexandru Petrescu <alexandru.petrescu@gmail.com>, "ipv6@ietf.org" <ipv6@ietf.org>
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Hi Tim,

> -----Original Message-----
> From: Tim Chown [mailto:tjc@ecs.soton.ac.uk]
> Sent: Tuesday, January 07, 2014 11:35 AM
> To: Brian E Carpenter
> Cc: Templin, Fred L; Alexandru Petrescu; ipv6@ietf.org
> Subject: Re: [Fwd: I-D Action: draft-carpenter-6man-why64-00.txt]
> 
> On 7 Jan 2014, at 19:22, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
> > On 08/01/2014 06:49, Templin, Fred L wrote:
> >> Hi Alex,
> >>
> >>>> ISATAP links are very real; the PHY is the underlying IPv4 site.
> >>> I don't doubt ISATAP links are real links which transport real packets.
> >>>
> >>> But a PHY would have a specific encoding scheme (OFDM, TDMA, etc.),
> >>> which IPV4 had not.
> >>
> >> That doesn't matter. What matters is that ISATAP (like AERO) specifies
> >> the generation of IPv6 interface identifiers which are 64-bits in
> >> length - which is exactly the subject your document is addressing.
> >
> > I agree with Fred. Actually for completeness we should list
> > RFC 2529 (6over4) too, although it is unused today as far as I know.
> 
> Yeah, I thought this was a bit of a diversion, but I agree it's a necessary rathole for completeness,
> whether anyone uses ISATAP or not.  Likewise 6over4.

Thanks, but please don't forget that ISATAP (and AERO and 6over4) are
IPv6-over-(foo) documents in that they specify the IPv6 interface
identifier format and the operation of IPv6 ND over specific link
layers (which as Alex agreed are real links which transport real
packets).

Thanks - Fred
fred.l.templin@boeing.com

> So I looked at some other transition tools.  e.g. 6rd says (section 4 of RFC5969) that "a 6rd
> delegated prefix SHOULD be /64 or shorter".  No MUST, presumably for ISPs that for some reason just
> give a customer one IPv6 address.  For 6to4, section 2 of RFC3056 implies use of /64.  Maybe we can
> just have a short section listing what each mechanism says, where at the moment I think we just have
> one sentence in section 3 ("IPv6 transition mechanisms such as NAT64 and NPTv6, as well as Basic
> transition and Teredo rely on the use of IIDs of length 64.")
> 
> Tim

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