Re: [Int-area] Alissa Cooper's No Objection on draft-ietf-intarea-frag-fragile-16: (with COMMENT)

"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Wed, 04 September 2019 15:54 UTC

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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: Ole Troan <otroan@employees.org>
CC: Bob Hinden <bob.hinden@gmail.com>, Tom Herbert <tom@herbertland.com>, "Joel Halpern" <joel.halpern@ericsson.com>, "draft-ietf-intarea-frag-fragile@ietf.org" <draft-ietf-intarea-frag-fragile@ietf.org>, "int-area@ietf.org" <int-area@ietf.org>
Thread-Topic: [Int-area] Alissa Cooper's No Objection on draft-ietf-intarea-frag-fragile-16: (with COMMENT)
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Date: Wed, 4 Sep 2019 15:53:51 +0000
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Subject: Re: [Int-area] Alissa Cooper's No Objection on draft-ietf-intarea-frag-fragile-16: (with COMMENT)
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> -----Original Message-----
> From: Ole Troan [mailto:otroan@employees.org]
> Sent: Wednesday, September 04, 2019 8:40 AM
> To: Templin (US), Fred L <Fred.L.Templin@boeing.com>
> Cc: Bob Hinden <bob.hinden@gmail.com>om>; Tom Herbert <tom@herbertland.com>om>; Joel Halpern <joel.halpern@ericsson.com>om>; draft-
> ietf-intarea-frag-fragile@ietf.org; int-area@ietf.org
> Subject: Re: [Int-area] Alissa Cooper's No Objection on draft-ietf-intarea-frag-fragile-16: (with COMMENT)
> 
> Fred,
> 
> >> Is that not the exact definition of outer fragmentation?
> >
> > No. I am talking about outer header (OH) followed by tunnel header (TH) followed
> > by inner packet (IP). Recipe:
> >
> >  1) wrap the IP in a TH to create a tunnel packet (TP)
> >  2) fragment the TP
> >  3) encapsulate each tunnel fragment in an independent OH
> >  4) send each outer packet (OP). These will look like ordinary
> >       unfragmented IP packets, but will contain a tunnel fragment
> 
> Right you might as well define your own tunnel fragmentation then.

With GUE encapsulation and GUE extensions, it would be a special tunnel
fragmentation yes. But, with RFC2473 encapsulation, it would be good old
IPv6 fragmentation per RFC8200.

This is a valid application of IPv6 fragmentation, hence in scope for this
discussion. The only difference is that the fragments will not be seen
by the network.

Fred

> And it will have a lot less overhead. Doing "segmentation" at what would be layer 4 (or 3.5) isn't what we are trying to discourage here.
> 
> Cheers,
> Ole