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

Loganaden Velvindron <loganaden@gmail.com> Wed, 08 May 2019 17:35 UTC

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From: Loganaden Velvindron <loganaden@gmail.com>
Date: Wed, 08 May 2019 21:34:36 +0400
Message-ID: <CAOp4FwReRs2krw0GUU8hMBxbvWh6rdv62FD=Z0Se0kFZs1jZ9w@mail.gmail.com>
Subject: Re: [internet-drafts@ietf.org: New Version Notification for draft-jones-6man-historic-rfc2675-00.txt]
To: 神明達哉 <jinmei@wide.ad.jp>
Cc: Ole Troan <otroan@employees.org>, 6man WG <ipv6@ietf.org>
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Comment in-line.

On Wed, May 8, 2019 at 9:08 PM 神明達哉 <jinmei@wide.ad.jp> wrote:
>
> At Wed, 8 May 2019 18:07:51 +0200,
> Ole Troan <otroan@employees.org> wrote:
>
> > > 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?
> >
> > I don't expect any implementation supporting it unless they also support data-link layers with an MTU > 64K.
>
> FWIW, (most if not all) BSD variants have been supporting jumbograms
> for many years (admittedly I don't know if it's still working as

Indeed, according to this
https://www.freebsd.org/doc/en/books/developers-handbook/ipv6.html#ipv6-jumbo

You need to re-compile the kernel to get support for it. So it's not
shipped by default.

I think that it's worth mentioning it that in the draft.

> originally implemented, but the code is still there).  When I worked
> on the implementation I confirmed its behavior with a loopback
> interface configured to have an MTU larger than 64KB.  In that sense,
> this statement of the draft is probably too strong:
>
>    This also removes the need for testing Jumbogram support, which
>    otherwise require links with a MTU greater than 65,535 bytes, making
>    testing of implementations impractical without significant effort.
>
> It's not a straightforward effort, but I don't think it requires a
> "significant" one.
>
> In any case, I agree there has been probably no real world deployment
> of jumbograms.  I don't have a strong opinion about whether to
> deprecate it.
>
> --
> JINMEI, Tatuya
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