[ntp:questions] NTPd is not sync for some poll interval values

Unruh unruh-spam at physics.ubc.ca
Fri Feb 6 14:18:09 UTC 2009


narainmg at hotmail.com (Gaurav Narain Mathur) writes:

>I have a problem where the NTPd would not sync the time with the
>timeserver (10.0.0.1) if minpoll value is 7 and maxpoll is 8. It works
>if the  minpoll is 4 maxpoll is 5. Can anybody please help me out in
>identifying what the problem could be? The "flash" never becomes
>"0" I think. Also another host on the same subnet sync with the same
>poll values and with the same server (10.0.0.1).

Your offset its too large. Use ntpd -g to have it get rid of the large
offset initially.



>Any help is much appreciated. Debug output is attached below.

>Thanks.

>[...]

>~ $ ntpq -c "pe"
>     remote           refid      st t when poll reach   delay   offset
>jitter
>=============================================================================
>=
> 10.0.0.1        64.247.17.254    3 u  117  128  377    1.125  -6423.0
>1427.38
>~ $ ntpq -c "pe"
>     remote           refid      st t when poll reach   delay   offset
>jitter
>=============================================================================
>=
> 10.0.0.1        64.247.17.254    3 u   14  128  377    1.160  -8010.8
>1420.48
>~ $
>~ $
>~ $
>~ $ ntpq -c "as"

>ind assID status  conf reach auth condition  last_event cnt
>===========================================================
>  1 63473  9014   yes   yes  none    reject   reachable  1
>~ $
>~ $
>~ $ ntpq -c "rv"
>assID=0 status=c011 sync_alarm, sync_unspec, 1 event, event_restart,
>version="ntpd 4.2.4p4 at 1.1520-o Wed Feb  4 21:58:44 UTC 2009 (1)",
>processor="mips", system="Linux/2.6.26.6", leap=11, stratum=16,
>precision=-13, rootdelay=0.000, rootdispersion=27.375, peer=0,
>refid=INIT, reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>poll=6, clock=cd34a655.87cf0951  Wed, Feb  4 2009 23:42:13.530, state=0,
>offset=0.000, frequency=0.000, jitter=0.122, noise=0.122,
>stability=0.000, tai=0
>~ $
>~ $
>~ $ ntpq -c "rv 63473"
>assID=63473 status=9014 reach, conf, 1 event, event_reach,
>srcadr=10.0.0.1, srcport=123, dstadr=10.0.0.9, dstport=123, leap=00,
>stratum=3, precision=-20, rootdelay=93.857, rootdispersion=86.807,
>refid=64.247.17.254, reach=377, unreach=0, hmode=3, pmode=4, hpoll=7,
>ppoll=7, flash=400 peer_dist, keyid=0, ttl=0, offset=-8010.843,
>delay=1.160, dispersion=1.989, jitter=1420.485,
>reftime=cd34a51d.a5c4c862  Wed, Feb  4 2009 23:37:01.647,
>org=cd34a636.e772df74  Wed, Feb  4 2009 23:41:42.904,
>rec=cd34a63e.ea5f7fc8  Wed, Feb  4 2009 23:41:50.915,
>xmt=cd34a63e.ea105e5d  Wed, Feb  4 2009 23:41:50.914,
>filtdelay=     1.16    6.87    5.52    1.29    1.03    1.12    5.75    1.10,
>filtoffset= -8010.8 -7691.1 -7368.6 -7053.1 -6738.2 -6423.0 -6110.4 -5788.1,
>filtdisp=      0.12    2.07    3.99    5.91    7.82    9.72   11.63   13.56
>~ $
>~ $

>[...]


>[...]

>~ $ cat /etc/ntp.conf

>###########################################################################
>#
># Permit time synchronization with our time source, but do not
># permit the source to query or modify the service on this system.
>restrict default kod nomodify notrap noquery

># Permit all access over the loopback interface.  This could
># be tightened as well, but to do so would effect some of
># the administrative functions.
>restrict 127.0.0.1

># Hosts on local network are less restricted.
>#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

># Undisciplined Local Clock. This is a fake driver intended for backup
># and when no outside source of synchronized time is available.
>fudge   127.127.1.0 stratum 10

># Drift file.  Put this in a directory which the daemon can write to.
># No symbolic links allowed, either, since the daemon updates the file
># by creating a temporary in the same directory and then rename()'ing
># it to the file.
>driftfile /tmp/etc/ntp/drift

># This command specifies the default directory path for cryptographic keys,
># parameters and certificates. The default is /usr/local/etc/.
>keysdir /tmp/etc/ntp/

># Key file containing the keys and key identifiers used when operating
># with symmetric key cryptography.
>keys /tmp/etc/ntp/keys

># Specify the key identifier to use with the ntpdc utility.
>#requestkey 8

># Specify the key identifier to use with the ntpq utility.
>#controlkey 8

>###########################################################################
># Specify the key identifiers which are trusted.
># trustedkey 4 8 42
>###########################################################################
>#trustedkey


>###########################################################################
># Add time servers here
># broadcast 192.168.1.255 key 42                # broadcast server
># broadcastclient                       # broadcast client
># broadcast 224.0.1.1 key 42            # multicast server
># multicastclient 224.0.1.1             # multicast client
># manycastserver 239.255.254.254                # manycast server
># manycastclient 239.255.254.254 key 42 # manycast client
>###########################################################################
>server 10.0.0.1 minpoll 7 maxpoll 8

>[...]
>_________________________________________________________________
>Windows Live™: Keep your life in sync.
>http://windowslive.com/howitworks?ocid=TXT_TAGLM_WL_t1_allup_howitworks_02200
>9




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