Technical data
Configuring and Managing NTP
12.3 Configuring Your NTP Host
Enables recording of loop filter statistics information. Each update of the
local clock outputs a line of the following form to the file generation set
named
loopstats
:
48773 10847.650 0.0001307 17.3478 2
The first two fields show the date (Modified Julian Day) and time (seconds
and fraction past UTC midnight). (A Julian Day [JD] begins at noon and
runs until the next noon. The JD number is the number of days [or part
of a day] since noon [UTC] on January 1, 4713 B.C. A Modified Julian
Day [MJD] is the JD minus 2,400,000.5.)
The next three fields show time offset (in seconds), frequency offset (in
parts per million) and time constant of the clock-discipline algorithm at
each update of the clock.
peerstats
Enables recording of peer statistics information. This includes statistics
records of all peers of an NTP server and of special signals, where present
and configured. Each valid update appends a line of the following form to
the current element of a file generation set named
peerstats
:
48773 10847.650 127.127.4.1 9714 -0.001605 0.00000 0.00142
The first two fields show the date (Modified Julian Day) and time (seconds
and fraction past UTC midnight). The next two fields show the peer
address in dotted-quad notation and status, respectively. The status field
is encoded in hexadecimal in the format described in Appendix A of the
NTP specification (RFC 1305). The final three fields show the offset,
delay, and dispersion (in seconds).
clockstats
Enables recording of clock driver statistics information. Each update
received from a clock driver outputs a line in the following form to the file
generation set named
clockstats
:
49213 525.624 127.127.4.1 93 226 00:08:29.606 D
The first two fields show the date (Modified Julian Day) and time (seconds
and fraction past UTC midnight). The next field shows the clock address
in dotted-quad notation, The final field shows the last timecode received
from the clock in decoded ASCII format, where meaningful. In some
clock drivers, a good deal of additional information can be gathered
and displayed as well. See information specific to each clock for further
details.
rawstats
Enables recording of raw timestamps. Each valid update appends a line
in the following form to the file generation set named
rawstats
:
51554 79509.68 16.20.208.53 16.20.208.97
3156617109.664603 3156617109.673268 3156617109.673268 31
56617109.673268 3156617109.666556
The first two fields show the date (Modified Julian Day) and time (seconds
and fraction past UTC midnight). The next two fields show the peer and
local addresses in dotted-quad notation. The next four fields are:
* The originate timestamp
* The received timestamp
Configuring and Managing NTP 12–7