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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.<br>
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<div dir="ltr"> -mel</div>
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<blockquote type="cite">On Aug 8, 2023, at 7:16 AM, Mike Hammett <nanog@ics-il.net> wrote:<br>
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"We use these exclusively in data centers"
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<div>How well does GPS work inside the datacenter?<br>
<br>
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<b>From: </b>"Mel Beckman" <mel@beckman.org><br>
<b>To: </b>"Mark Tinka" <mark@tinka.africa><br>
<b>Cc: </b>nanog@nanog.org<br>
<b>Sent: </b>Saturday, August 5, 2023 2:26:37 PM<br>
<b>Subject: </b>Re: NTP Sync Issue Across Tata (Europe)<br>
<br>
Mark,<br>
<br>
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.<br>
<br>
-mel via cell<br>
<br>
> On Aug 5, 2023, at 11:22 AM, Mark Tinka <mark@tinka.africa> wrote:<br>
> <br>
> <br>
> <br>
>> On 8/5/23 20:17, Chris Adams wrote:<br>
>> <br>
>> It's the NTP pool people you need to talk to - the .freebsd. bit is just<br>
>> a vendored entry into the pool (more for load tracking and management).<br>
> <br>
> Yes, Andreas clarified in unicast. Will do. Thanks.<br>
> <br>
> Mark.<br>
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