Re: [c-nsp] NTP network design considerations

Gert Doering via cisco-nsp <[email protected]> Fri, 14 Oct 2022 22:27:54 +0200

Newsgroups	gmane.network.nsp.cisco
Message-ID	<[email protected]>

Hi,

On Fri, Oct 14, 2022 at 02:41:45PM -0400, harbor235 wrote:
> I hear what your saying but NTP is an active attack vector, I don't trust
> outside resources implicitly and traffic segmentation is a prudent measure
> especially if you are getting internet time. Now if you have your own
> stratum1 then I understand your point more.

The Meinberg boxes have GPS receivers, so they provide Stratum 1 directly.

The FreeBSD boxes run standard NTP time, and sync to a variety of 
official sources (like ntp.se) that are hard to manipulate all at
the same time.

Now what I'd really like is to use one of those...

https://www.oscilloquartz.com/de-de/products-and-services/ptp-grandmaster-clocks/sfp-pluggable-ptp-grandmasters/osa-5401-series

... plug it directly into one of our Aristas, *and* have the router 
use the PTP time source to feed its own NTP service, as stratum 1...

"Less boxes"

gert
-- 
"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             [email protected]

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