[ntp:questions] Time server question

Thomas Laus lausts at acm.org
Fri Jun 21 11:26:08 UTC 2019


On 2019-06-20, Chris <xxx.syseng.yyy at gfsys.co.uk> wrote:
> Have a couple of surplus gps based ntp servers that have been
> used for time sync in the lab for few years. They are on a UPS
> with several hours backup and seems like a good idea  to use
> them to contribute to the ntp global network.
>
> Don't want to expose them directly to the net, so plan to
> isolate them, either via a Solaris zone or
> FreeBSD jail. This will have 2 network interfaces, ntp subnet
> facing and the other to internet via the firewall. The ntp
> side will run ntp client, internet side runs ntp server.
>
Will either isolation solution have direct access to the computer
CPU?  The GPS clock will need the ability to directly adjust the
frequency of the CPU to achieve expected results for a Stratum 1
server.

> Question is, will such an intermediate machine degrade the
> time served, or will it still be reported as a stratum 1
> source. Seems a waste otherwise.
>
> ntpq -p currently reports:
>
> remote      refid  st t when poll reach delay   offset   disp
>=============================================================
> *chronos   .GPS.   1 u   23   64  377   0.18   -0.018    0.03
> +nts100    .GPS.   1 u   21   64  377   0.46   -0.071    0.08
>
That looks like a good billboard and should make a good S1 time
server if you can resolve your concerns about making it available
as an internet host.

Tom

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