Re: [Ntp] Antw: [EXT] Re: WGLC on draft‑ietf‑alternative‑port‑01

Watson Ladd <watsonbladd@gmail.com> Thu, 29 July 2021 15:02 UTC

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From: Watson Ladd <watsonbladd@gmail.com>
Date: Thu, 29 Jul 2021 08:01:45 -0700
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To: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
Cc: Miroslav Lichvar <mlichvar@redhat.com>, Dieter Sibold <dsibold.ietf@gmail.com>, NTP WG <ntp@ietf.org>, Danny Mayer <mayer@pdmconsulting.net>
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On Thu, Jul 29, 2021, 12:45 AM Ulrich Windl
<Ulrich.Windl@rz.uni-regensburg.de> wrote:
<snip>
> >> We see issues at Cloudflare with packet delivery on port 123. ISP
> >> middleboxes are going to police by length, and an alternative port is
> >> the way forward. There is much less policing on the alternative ports.
> >
> > Actually I'd think teching cloudflare would be better than changing the
>
> I had meant to write "teaching"...

It's not our devices: it's middleboxes in ISP networks. We only find
out from customer pcaps where one in four NTS packets makes it
through. The policing is by length because that is what these boxes
support.

>
>
> > port.
> > Otherwise: When do we change the port again?

Don't screw up and put UDP amplifiers out, and the port will be fine.

> >
> >>
> >> Sincerely,
> >> Watson Ladd
> >>
> >>>
> >>> ‑‑
> >>> Miroslav Lichvar
> >>>
> >>
> >>
> >> ‑‑
> >> Astra mortemque praestare gradatim
> >>
> >> _______________________________________________
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> >
> >
> >
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>
>