Re: NTP Sync Issue Across Tata (Europe)

[Mel Beckman <mel () beckman org>]

It works fine, and is an industry standard. you have to mount the GPS antenna near a window with sky visibility, or on 
the roof. Many point-to-point microwave radios have GPS built in to obtain accurate timing for transmission 
multiplexing.

 -mel

On Aug 8, 2023, at 7:16 AM, Mike Hammett <nanog () ics-il net> wrote:


"We use these exclusively in data centers"

How well does GPS work inside the datacenter?



-----
Mike Hammett
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________________________________
From: "Mel Beckman" <mel () beckman org>
To: "Mark Tinka" <mark@tinka.africa>
Cc: nanog () nanog org
Sent: Saturday, August 5, 2023 2:26:37 PM
Subject: Re: NTP Sync Issue Across Tata (Europe)

Mark,

You might consider setting up your own GPS-based NTP network. Commercial Ethernet GPS-sourced NTP servers, such as the 
Time Machines, TM1000A, are as little as $400. Or you can roll your own using a Raspberry Pi or similar nano computer 
with a GPS module and antenna. We use these exclusively in data centers now rather than depending on Internet NTP 
servers, primarily for security, because financial transactions in e-commerce can be sensitive to false time 
information. There are also a variety of NTP-based Internet attacks, so if you can block NTP at your border you’ve 
eliminated another attack surface.

-mel via cell

> On Aug 5, 2023, at 11:22 AM, Mark Tinka <mark@tinka.africa> wrote:
>
> 
>
> > On 8/5/23 20:17, Chris Adams wrote:
> >
> > It's the NTP pool people you need to talk to - the .freebsd. bit is just
> > a vendored entry into the pool (more for load tracking and management).
>
> Yes, Andreas clarified in unicast. Will do. Thanks.
>
> Mark.