Table of Contents
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Click on NTP in the sidebar. The NTP overview will be shown, allowing you to monitor and configure your the NTP settings.
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NTP Tracking Information
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State: shows if the reference clock is activated or disabled.
Type: can be PPS, SHM, SOCK or PHC.
Clock: shows the available options of the reference clock.
Rate: sets the rate of the pulses in the PPS signal (in Hz).
PPS: forces the NTP server to treat any reference clock (e.g. SHM or PHC) as a PPS reference clock.
TAI: indicates if the reference clock keeps time in TAI instead of UTC and that the NTP server should correct its offset by the current TAI-UTC offset.
Required: at least one of the sources specified with this option is selectable before updating the clock. Together with the Always Trust option, this can be useful to allow a trusted, but not very precise, reference clock to be safely combined with unauthenticated NTP sources in order to improve the accuracy of the clock.
Preferred: prefer this source over sources without the preferred option.
Always Trust: assume time from this source is always true. It can be rejected as a falseticker in the source selection only if another source with this option does not agree with it.
Actions: allows you to edit or delete a reference clock.
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Available options
Hostname: the hostname or IP address of the server.
Port: port of the server.
State of Source: enable or disable this source.
Prefer this Source: prioritises the use of this source.
Require this Source: sets the source to be required or optional.
Trust this Source: define if and how to trust this source.
Maximum delay: sets the maximum delay between the request and the response.
Minimum/Maximum Polling: specifies the minimum/maximum interval between requests sent to the server.
Offset correction: specifies a correction (in seconds) which will be applied to offsets measured with this source.
Court of measurements: target number of measurements to use for the regression algorithm which the NTP service will try to maintain by adjusting the polling interval between minimum polling and maximum polling.
Improve accuracy of response: when enabled, the NTP service will shorten the interval between up to four requests to 2 seconds or less when it cannot get a good measurement from the server.
Improve accuracy of requests: when enabled, the interval between the first four requests sent to the server will be 2 seconds or less instead of the interval specified by the minimum polling option, which allows the network time protocol service to make the first update of the clock shortly after the start.
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Editing a NTP Syncing Server
Press the Edit button of the NTP syncing server you want to edit.
Configure the NTP syncing server to your needs. The available options are documented above.
Press the Save NTP Server Settings button when you’re done.
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Status: shows if the NTP server is enabled or disabled.
Hostname: shows the IP address or hostname with the specific port.
Required: require that at least one of the sources specified with this option is selectable before updating the clock. Together with the always trust option, this might be useful to allow a trusted authenticated source to be safely combined with unauthenticated sources in order to improve the accuracy of the clock.
Preferred: prefer this source over sources without the preferredoption.
Always Trust: assume time from this source is always true. It can be rejected as a falseticker in the source selection only if another source with this option does not agree with it.
Polling:
Min: specifies the minimum interval between requests sent to the server as a power of 2 in seconds.
Max: specifies the maximum interval between requests sent to the server as a power of 2 in seconds.
Requests: the target number of measurements to use for the regression algorithm which the network time protocol service will try to maintain by adjusting the polling interval between minimum polling and maximum polling.
Actions: allows you to edit or delete peers.
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Status: shows if the pool is enabled or disabled.
Hostname: shows the IP address or hostname with the specific port.
Required: require that at least one of the sources specified with this option is selectable before updating the clock. Together with the always trust option, this might be useful to allow a trusted authenticated source to be safely combined with unauthenticated sources in order to improve the accuracy of the clock.
Preferred: prefer this source over sources without the preferred option.
Always Trust: assume time from this source is always true. It can be rejected as a falseticker in the source selection only if another source with this option does not agree with it.
Polling:
Min: specifies the minimum interval between requests sent to the server as a power of 2 in seconds.
Max: specifies the maximum interval between requests sent to the server as a power of 2 in seconds.
Requests: target number of measurements to use for the regression algorithm which the network time protocol service will try to maintain by adjusting the polling interval between minimum polling and maximum polling.
Actions: allows you to edit or delete pools.
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