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Re: [internet-drafts@ietf.org: New Version Notification for draft-jones-6man-historic-rfc2675-00.txt]

"Dale W. Carder" <dwcarder@es.net> Thu, 09 May 2019 03:15 UTC

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Date: Wed, 08 May 2019 22:15:47 -0500
From: "Dale W. Carder" <dwcarder@es.net>
To: Bob Hinden <bob.hinden@gmail.com>
Cc: IPv6 List <ipv6@ietf.org>
Subject: Re: [internet-drafts@ietf.org: New Version Notification for draft-jones-6man-historic-rfc2675-00.txt]
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References: <20190508125743.GA19360@tom-desk.erg.abdn.ac.uk> <19A018DE-280E-4400-95AC-7A3697ABE4B8@employees.org> <B6A0FA6B-F59B-4F5E-90A8-6B6500425469@gmail.com>
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Thus spake Bob Hinden (bob.hinden@gmail.com) on Wed, May 08, 2019 at 10:26:48AM -0700:
> Hi,
> 
> > On May 8, 2019, at 9:07 AM, Ole Troan <otroan@employees.org> wrote:
> > 
> >> Hello 6man,
> >> 
> >> We have put this together to change the status of RFC2675 to Historic
> >> and would like to request discussion in the working group.
> > 
> > IPv6 jumbograms was intended for some super computer inter connect with a massive MTU.
> > I don't know of any use of it, but is it harmful if the specification is left there in place?
> > 
> 
> Are there any current network interfaces that can support packets larger than 65,535 octets?   As I remember, it was intended for network interfaces like hyperchannel that could support packets larger than 65,535.    Did we every define an IPv6 over Hyperchannel specification?

RFC4755 points out that infiniband's connected mode can do 2^31.  (IIRC,
the "fragmentation" is done at a lower hardware layer)

If not causing active harm, I would think deprecating IPv6 jumbograms would 
be quite premature.

Dale

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