[AG-TECH] NTP Questions

George Estes gestes at ncsa.uiuc.edu
Fri Jul 12 11:23:00 CDT 2002


   As I remember the time on your machine must be close, I don't remember 
how close, before the server will snyc.  I know it will not sync if you 
machine clock is off by 10 minutes.  On my machine, RedHat 7.1, I then run 
/usr/sbin/ntpdc -p my-machine-name  and the delay should be less than .01.

George
At 04:19 PM 7/12/2002 +0100, you wrote:
>I've got a couple of questions related to NTP. Bear with me, this is not a
>short email...
>
>I've built my audio and video capture machines manually (i.e. not AGiB).
>That means that I installed all the bits separately. That also means that my
>NTP wasn't nicely configured and "just working".
>
>Don Morton helpfully told me what should go in my file /etc/ntp.conf:
>
>server ntp-1.accessgrid.org
>driftfile /etc/ntp/drift
>
>I restarted ntpd afterwards.
>
>My time stayed as it was (about 10 minutes wrong!). Do I have to wait to get
>into synch? Maybe, but my settings don't look right anyway. (Read on...)
>
>I've been scooting around some of the docs about ntp and tried running
>ntpq - with 'pe', 'as' and 'rv'. I got this:
>
>---------Start output
>[root at audio root]# ntpq
>ntpq> pe
>      remote           refid      st t when poll reach   delay   offset
>jitter
>============================================================================
>==
>  ag.mcs.anl.gov  0.0.0.0         16 u    -   64    0    0.000    0.000
>4000.00
>ntpq> as
>ind assID status  conf reach auth condition  last_event cnt
>===========================================================
>   1 48124  8000   yes   yes  none    reject
>ntpq> rv 48124
>status=8000 unreach, conf, no events,
>srcadr=ag.mcs.anl.gov, srcport=123, dstadr=192.150.184.66, dstport=123,
>leap=11, stratum=16, precision=-17, rootdelay=0.000,
>rootdispersion=0.000, refid=0.0.0.0, reach=000, unreach=13, hmode=3,
>pmode=0, hpoll=6, ppoll=10, flash=00 ok, keyid=0, offset=0.000,
>delay=0.000, dispersion=0.000, jitter=4000.000,
>reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>org=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>rec=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>xmt=c0d96d24.d4832335  Fri, Jul 12 2002 15:58:44.830,
>filtdelay=     0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00,
>filtoffset=    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00,
>filtdisp=   16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0
>ntpq> quit
>[root at audio root]#
>---------End output
>
>Do I have a problem?
>
>Second question. (Is anyone still with me, I wonder...) On my other machine,
>I tried installing xntp. Possibly not a smart idea, but anyway.
>
>Here, I got a different (possibly worse because I've got 'reach=no' rather
>than 'auth=no'?) output:
>
>---------Start output
>root at video etc]# /usr/sbin/ntpq
>ntpq> pe
>      remote           refid      st t when poll reach   delay   offset
>disp
>============================================================================
>==
>  ag.mcs.anl.gov  0.0.0.0         16 u    -   64    0     0.00    0.000
>16000.0
>ntpq> as
>ind assID status  conf reach auth condition  last_event cnt
>===========================================================
>   1 37636  8000   yes    no
>ntpq> quit
>---------End output
>
>Help would be gratefully received...
>
>Thanks,
>Mike
>
>-----------------------oOo-----------------------
>Michael Daw
>Computer Services for Academic Research (CSAR)
>
>Manchester Computing, Kilburn Building,
>University of Manchester, Manchester M13 9PL, UK
>
>Tel: +44 (0)161 275 7026
>Fax: +44 (0)161 275 6800
>Email: michael.daw at man.ac.uk
>
>http://www.csar.cfs.ac.uk/staff/daw/
>-----------------------OoO-----------------------
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