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From: Geoff Huston <gih@apnic.net>
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> On 5 Jul 2024, at 10:37=E2=80=AFAM, Tim Wicinski <tjw.ietf@gmail.com> =
wrote:
>=20
> Paul
>=20
> On Thu, Jul 4, 2024 at 6:41=E2=80=AFPM Paul Vixie =
<paul=3D40redbarn.org@dmarc.ietf.org> wrote:
> On Thursday, July 4, 2024 7:05:22 AM PDT Tim Wicinski wrote:
> > On Tue, Jul 2, 2024 at 9:26=E2=80=AFPM David Farmer <farmer@umn.edu> =
wrote:
> > > 2. Also, maybe R5 should have text similar to R3 with "...the =
minimum
> > > of...the interface MTU, the network MTU...and 1400 bytes..." =
Instead of
> > > "It should use a limit of 1400 bytes, but a smaller limit MAY be =
used."
> >=20
> > Something like this:
> >=20
> > "UDP requestors should limit the requestor's maximum UDP payload =
size  to
> > use the RECOMMENDED size of 1400 bytes, but a smaller limit MAY be =
used."
>=20
> As before, I'd like to future-proof this document. 1400 may not =
survive and should not be a hard limit. If someone ever gets PLPMTUD =
working, or if local knowledge includes MTU over a topology as a static =
configuration, then the recommended value should be ignored, and the =
measured or locally defined limit should be the operational maximum for =
that datagram.
>=20
> Thus, not only a smaller limit, but also a larger limit, may be =
sometimes used. This document need not enumerate all such cases, but =
should not require revision if 1400 turns out to be like 640KB -- not a =
sensible limit for all possible futures.
>=20
> I agree with you on future proofing, and I did not seem to craft that =
in my suggestion.
>=20
> David mentions R5 should have similar text 'flow' (my word) as R3.=20
>=20
> Here is R3
>=20
>    R3.  UDP responders should compose response packets that fit in the
>    minimum of the offered requestor's maximum UDP payload size
>    [RFC6891], the interface MTU, the network MTU value configured by =
the
>    knowledge of the network operators, and the RECOMMENDED maximum =
DNS/
>    UDP payload size 1400.  (See Appendix A for more information.)
>=20
> Here is R5
>=20
>    R5.  UDP requestors should limit the requestor's maximum UDP =
payload
>    size.  It should use a limit of 1400 bytes, but a smaller limit MAY
>    be used.  (See Appendix A for more information.)
>=20
> Me trying (and perhaps failing again) :
>=20
> UDP requestors should limit requestor's maximum UDP payload size that =
fit in the minimum=20
> of the offered requestor's maximum UDP payload size, [RFC6891],
> the interface MTU, the network MTU value configured by the knowledge =
of the network operators,=20
> and the RECOMMENDED maximum DNS/UDP payload size 1400. =20
>=20

I think you appear to be getting "requestor" and "responder" confused in =
your proposed text. Did you mean to say the following?

UDP responders should compose response response packets with a maximum =
UDP payload size that fits in the minimum=20
of the offered requestor's maximum UDP payload size, [RFC6891], the =
interface MTU, the network MTU value configured by the knowledge of the =
network operators,=20
and the RECOMMENDED maximum DNS/UDP payload size 1400.=20

Geoff







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