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> Tue, 03 September 2019 15:41 UTC

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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: Fernando Gont <fgont@si6networks.com>, Joe Touch <touch@strayalpha.com>, Alissa Cooper <alissa@cooperw.in>
CC: 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>, The IESG <iesg@ietf.org>, "intarea-chairs@ietf.org" <intarea-chairs@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: Tue, 3 Sep 2019 15:41:35 +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: Fernando Gont [mailto:fgont@si6networks.com]
> Sent: Tuesday, September 03, 2019 7:50 AM
> To: Templin (US), Fred L <Fred.L.Templin@boeing.com>om>; Joe Touch <touch@strayalpha.com>om>; Alissa Cooper <alissa@cooperw.in>
> Cc: Joel Halpern <joel.halpern@ericsson.com>om>; draft-ietf-intarea-frag-fragile@ietf.org; int-area@ietf.org; The IESG <iesg@ietf.org>rg>;
> intarea-chairs@ietf.org
> Subject: Re: [Int-area] Alissa Cooper's No Objection on draft-ietf-intarea-frag-fragile-16: (with COMMENT)
> 
> On 3/9/19 17:33, Templin (US), Fred L wrote:
> > Why was this section taken out:
> >
> >> 1.1.  IP-in-IP Tunnels
> >>
> >>    This document acknowledges that in some cases, packets must be
> >>    fragmented within IP-in-IP tunnels [I-D.ietf-intarea-tunnels].
> >>    Therefore, this document makes no additional recommendations
> >>    regarding IP-in-IP tunnels.
> >
> > Tunnels always inflate the size of packets to the point that they may exceed
> > the path MTU even if the original packet is no larger than the path MTU. And,
> > for IPv6 the only guarantee is 1280. Therefore, in order to robustly support
> > the minimum IPv6 MTU tunnels MUST employ fragmentation.
> 
> Isn't that an oxymoron? If fragmentation is fragile, if you need
> something robust, you need to rely on something else....

IPv6 fragmentation is not fragile - only IPv4 fragmentation is fragile.

> --
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
> 
> 
>