[AG-TECH] NTP Questions

[Mike Daw]

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

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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-----------------------