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

Watson Ladd <watsonbladd@gmail.com> Sat, 31 July 2021 17:00 UTC

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From: Watson Ladd <watsonbladd@gmail.com>
Date: Sat, 31 Jul 2021 09:59:59 -0700
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To: Danny Mayer <mayer@pdmconsulting.net>
Cc: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>, Miroslav Lichvar <mlichvar@redhat.com>, Dieter Sibold <dsibold.ietf@gmail.com>, NTP WG <ntp@ietf.org>
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On Thu, Jul 29, 2021, 12:12 PM Danny Mayer <mayer@pdmconsulting.net> wrote:
>
>
> On 7/29/21 11:01 AM, Watson Ladd wrote:
> > 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.
> >
> So how would using an alternative port make a difference?

The other port is not policed now. We use it, and take care to not
massively deploy amplifiers on it, so it does not get policed.  This
issue is not about opening firewalls that are under people's control.
This is about firewalls on ISP networks to protect the ability of the
network to function, that break and do things like take NIST offline
in the Western US for a month.

Sincerely,
Watson

>
>
> Danny
>