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Cisco Aironet 600 Series OfficeExtend Access Point User Guide
Appendix A Open Source Used In Cisco Aironet 600 Series OfficeExtend Access Point
ntpclient 345.0
-i interval check time every interval seconds (default 600)
-l attempt to lock local clock to server using adjtimex(2)
-p port local NTP client UDP port (de
fault 0 means "any available")
-r replay a
nalysis code based on stdin
-s simpl
e clock set (implies -c 1)
Mortal users can use this program for monitoring, but not clock setting
(with the -s or -l switches). The -l switch has not been well tested.
Simulation (with -r) actually looks ha
lfway decent, so locking should be
OK too, but it needs some tuning.
The test.dat file has 200 lines of sample output. Its first few lines,
with the output column headers that are shown when the -d option is
chosen, are:
day second elapsed sta
ll skew dispersion freq
51785 180.386 1398.0 40.3 953773.9 793.5 -1240000
51785 780.382 1358.0 41.3 954329.0 915.5 -1240000
51785 1380.381 1439.0 56.0 954871.3 915.5 -1240000
day, second: time of measurement
elapsed: total time from query to response (microseconds)
stall: time the server reports that it sat on the request (microseconds)
skew: difference between local
time and server time (microseconds)
dispersion: reported by server
, see RFC-1305 (microseconds)
freq: local clock frequency adjustment (Linux only, ppm*65536)
test.dat is suitable for piping into ntpclient -r. I have over 53000
samples (lines) archived for study
, that I don’t include here.
They are spaced 10 minutes apart, represen
ting over a year of data
logging (not continuous, unfortunately).
envelope is a perl script that I ha
ve used for my lock studies.
It’s kind of a hack and not worth documenting here.
- Larry Doolitt
le <larry@doolittle.boa.org
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
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