ntpq

NTP Query

remote
The IP address or DNS name of the remote server
refid
An identification of the type of the reference clock.
st
The “stratum” or level of the server: for almost all
systems, 2 is great. Your local system will have a higher number.
t
The type of service. Your setup will show “l” for local on your
local system, or “u” for “unicast” for communicating with remote
servers.
when
This is the number of seconds since the server was last heard from.
After a couple of minutes of operation your server should start to
report numeric values here.
poll
Current polling interval in seconds. When remote servers are
responding, “when” should be no greater than “poll”.
reach
This and the remaining fields are important indicators of the health
of your local server, your remote servers, and their communication.
This field is really a bit array indicating whether responses have been
received to your local server’s eight most recent requests. The value starts
at 0. If your local server is receiving responses to all its requests,
it will go to 1, then 3, then 7. The display is in octal, so 377 is the
maximum value. Anything less indicates that either your local server
recently started or some requests did not receive responses.
delay
Recent average roundtrip time in milliseconds from request to response.
offset
Estimated differential between your system clock and this time
server’s clock, in milliseconds. You may consider this the “bottom
line” on the accuracy of your system clock. NTP can usually drive this
down to the level of the jitter or less.
jitter
A measure of the variability of the delays between request and
receipt of a response, in milliseconds. High jitter tends to limit
your server’s ability to synchronize accurately.
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