[ntp:questions] Re: ntpdate steps 86400 seconds

K.D.P khanh.d.pham at gmail.com
Sat Oct 1 12:14:26 UTC 2005


I ran ntpdate -d time_server_ip (just before to just after midnight)
additional to my original ntpdate -sB time_server_ip (every minute) in cron.
Here is the result:

30 Sep 23:57:01 ntpdate[19014]: ntpdate 4.1.1 at 1.786 Mon Sep  9 20:57:31 UTC
2002 (1)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
server 10.168.214.71, port 123
stratum 1, precision -18, leap 00, trust 000
refid [GPS], delay 0.02605, dispersion 0.00095
transmitted 4, in filter 4
reference time:    c6e84f4c.00000000  Fri, Sep 30 2005 23:57:00.000
originate timestamp: c6e84f4d.34fce550  Fri, Sep 30 2005 23:57:01.206
transmit timestamp:  c6e84f4d.347fed20  Fri, Sep 30 2005 23:57:01.205
filter delay:  0.02615  0.02605  0.02605  0.02605
         0.00000  0.00000  0.00000  0.00000
filter offset: -0.00086 -0.00005 0.000817 0.001690
         0.000000 0.000000 0.000000 0.000000
delay 0.02605, dispersion 0.00095
offset -0.000057

30 Sep 23:57:01 ntpdate[19014]: adjust time server 10.168.214.71
offset -0.000057 sec
30 Sep 23:58:00 ntpdate[19020]: ntpdate 4.1.1 at 1.786 Mon Sep  9 20:57:31 UTC
2002 (1)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
server 10.168.214.71, port 123
stratum 1, precision -18, leap 00, trust 000
refid [GPS], delay 0.02698, dispersion 0.00006
transmitted 4, in filter 4
reference time:    c6e84f87.00000000  Fri, Sep 30 2005 23:57:59.000
originate timestamp: c6e84f88.88fe6cfa  Fri, Sep 30 2005 23:58:00.535
transmit timestamp:  c6e84f88.897689ca  Fri, Sep 30 2005 23:58:00.536
filter delay:  0.02701  0.02702  0.02788  0.02698
         0.00000  0.00000  0.00000  0.00000
filter offset: -0.00248 -0.00250 -0.00296 -0.00251
         0.000000 0.000000 0.000000 0.000000
delay 0.02698, dispersion 0.00006
offset -0.002518

30 Sep 23:58:00 ntpdate[19020]: adjust time server 10.168.214.71
offset -0.002518 sec
30 Sep 23:59:00 ntpdate[19027]: ntpdate 4.1.1 at 1.786 Mon Sep  9 20:57:31 UTC
2002 (1)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
server 10.168.214.71, port 123
stratum 1, precision -18, leap 00, trust 000
refid [GPS], delay 0.02603, dispersion 0.00000
transmitted 4, in filter 4
reference time:    c6e9a144.00000000  Sat, Oct  1 2005 23:59:00.000
originate timestamp: c6e9a144.ea4521cf  Sat, Oct  1 2005 23:59:00.915
transmit timestamp:  c6e84fc4.e9487768  Fri, Sep 30 2005 23:59:00.911
filter delay:  0.02608  0.02603  0.02603  0.02603
         0.00000  0.00000  0.00000  0.00000
filter offset: 86400.00 86400.00 86400.00 86400.00
         0.000000 0.000000 0.000000 0.000000
delay 0.02603, dispersion 0.00000
offset 86400.001896

30 Sep 23:59:00 ntpdate[19027]: step time server 10.168.214.71 offset
86400.001896 sec
 1 Oct 00:00:01 ntpdate[19037]: ntpdate 4.1.1 at 1.786 Mon Sep  9 20:57:31 UTC
2002 (1)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
server 10.168.214.71, port 123
stratum 1, precision -18, leap 00, trust 000
refid [GPS], delay 0.02701, dispersion 0.00000
transmitted 4, in filter 4
reference time:    c6e9a180.00000000  Sun, Oct  2 2005  0:00:00.000
originate timestamp: c6e9a181.3a12cadb  Sun, Oct  2 2005  0:00:01.226
transmit timestamp:  c6e85001.39a7f3cf  Sat, Oct  1 2005  0:00:01.225
filter delay:  0.02701  0.02707  0.02794  0.02701
         0.00000  0.00000  0.00000  0.00000
filter offset: 86400.00 86400.00 86400.00 86400.00
         0.000000 0.000000 0.000000 0.000000
delay 0.02701, dispersion 0.00000
offset 86400.000962

 1 Oct 00:00:01 ntpdate[19037]: step time server 10.168.214.71 offset
86400.000962 sec
 1 Oct 00:01:00 ntpdate[19091]: ntpdate 4.1.1 at 1.786 Mon Sep  9 20:57:31 UTC
2002 (1)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
server 10.168.214.71, port 123
stratum 1, precision -18, leap 00, trust 000
refid [GPS], delay 0.02693, dispersion 0.00000
transmitted 4, in filter 4
reference time:    c6e8503b.00000000  Sat, Oct  1 2005  0:00:59.000
originate timestamp: c6e8503c.5fd75a25  Sat, Oct  1 2005  0:01:00.374
transmit timestamp:  c6e8503c.5f52220b  Sat, Oct  1 2005  0:01:00.372
filter delay:  0.02698  0.02696  0.02695  0.02693
         0.00000  0.00000  0.00000  0.00000
filter offset: 0.001402 0.001362 0.001379 0.001370
         0.000000 0.000000 0.000000 0.000000
delay 0.02693, dispersion 0.00000
offset 0.001370

 1 Oct 00:01:00 ntpdate[19091]: adjust time server 10.168.214.71 offset
0.001370 sec
 1 Oct 00:02:00 ntpdate[19098]: ntpdate 4.1.1 at 1.786 Mon Sep  9 20:57:31 UTC
2002 (1)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
receive(10.168.214.71)
transmit(10.168.214.71)
server 10.168.214.71, port 123
stratum 1, precision -18, leap 00, trust 000
refid [GPS], delay 0.02603, dispersion 0.00085
transmitted 4, in filter 4
reference time:    c6e85077.00000000  Sat, Oct  1 2005  0:01:59.000
originate timestamp: c6e85078.c11ef214  Sat, Oct  1 2005  0:02:00.754
transmit timestamp:  c6e85078.c1465e89  Sat, Oct  1 2005  0:02:00.754
filter delay:  0.02608  0.02605  0.02603  0.02605
         0.00000  0.00000  0.00000  0.00000
filter offset: -0.00338 -0.00254 -0.00167 -0.00081
         0.000000 0.000000 0.000000 0.000000
delay 0.02603, dispersion 0.00085
offset -0.001678

 1 Oct 00:02:00 ntpdate[19098]: adjust time server 10.168.214.71
offset -0.001678 sec

The reference timestamp and originate timestamp is a day (=86400 sec) ahead.





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