John Gilmore wrote:
Subsequent conversation has shown that you are both right here.
Yes, many public NTP servers ARE using GPS-derived time.
Yes, some public NTP servers ARE NOT using GPS-derived time.
The point is whether
: 2) Run a set of internal NTPd servers, and configure them to pull
:
- Original Message -
> From: "John Gilmore"
> Am I confused? Getting the time over a multi-gigabit Internet from a
> national time standard agency such as NIST (or your local country's
> equivalent) should produce far better accuracy and stability than
> relying on locally received GPS s
- Original Message -
> From: "Forrest Christian (List Account)"
> Let me address your points:
[ ... ]
> Let's assume you have a typical GPS-derived NTP server using a typical
> commercially available timing GNSS module. To convince that receiver that
> it was a different time, I'd need
If I'm spoofing time, I'm going to produce an entire constellation of
satellites. That is, I'm going to provide a signal which looks like all
of the satellites in view providing their timing signals on whatever time I
want your GPS receiver to think it is. All I have to do is ensure that
your r
Gotcha. The Bad Guys are smarter than me. :-)
Cheers,
-- jra
- Original Message -
> From: "Forrest Christian (List Account)"
> To: "jra"
> Cc: "nanog list"
> Sent: Sunday, August 13, 2023 8:06:30 PM
> Subject: Re: NTP Sync Issue Across Tata (Europe)
> If I'm spoofing time, I'm going
" As such, the ultimate (a little expensive) solution is to have
your own Rb clocks locally."
Yeah, that's a reasonable course of action for most networks. *sigh*
-
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
Midwest-IX
http://www.midwest-ix.com
- Orig
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