Re: ntp clients out of sync with server

On Oct 29, 1:08 am, David Woolley
<da...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
naih...@xxxxxxxxx wrote:

The output from ntpq -c"rv":

I asked you to do ntpq -c"rv nnnnn"
where nnnnn is the number given by ntpq -c"assoc"
for the relevant server.

However, this output does indicate that you are synchronised to
something other than the local clock.  You need to run the command
when the system is broken.

That is really help, at the time sync is successful,

ntpq -c"assoc"

ind assID status conf reach auth condition last_event cnt
===========================================================
1 46864 9614 yes yes none sys.peer reachable 1

After the sync is broken

ntpq -c"assoc"

ind assID status conf reach auth condition last_event cnt
===========================================================
1 46864 9014 yes yes none reject reachable 1

condition change from sys.peer to reject, status also changed

ntpq -c"rv 46864"
assID=46864 status=9014 reach, conf, 1 event, event_reach,
srcadr=10.200.98.51, srcport=123, dstadr=10.200.98.110, dstport=123,
leap=00, stratum=5, precision=-20, rootdelay=0.000,
rootdispersion=1175.797, refid=127.0.0.1, reach=377, unreach=0,
hmode=3,
pmode=4, hpoll=8, ppoll=8, flash=400 peer_dist, keyid=0, ttl=0,
offset=-24.021, delay=0.294, dispersion=6.001, jitter=1.199,
reftime=00000000.00000000 Wed, Feb 6 2036 22:28:16.000,
org=ccb35db7.959d8613 Wed, Oct 29 2008 15:09:59.584,
rec=ccb35db7.9bf0592f Wed, Oct 29 2008 15:09:59.609,
xmt=ccb35db7.9bda87ad Wed, Oct 29 2008 15:09:59.608,
filtdelay= 0.31 0.29 0.32 0.33 0.32 0.31 0.40
0.30,
filtoffset= -24.55 -24.02 -23.49 -23.01 -22.56 -22.15 -21.85
-21.38,
filtdisp= 0.00 3.84 7.71 11.54 15.41 19.28 23.10
26.96

If I start the ntpd client with -d option, it print out
auth_agekeys: at 5xxx keys 1 expired 0
looks like the sync break relate to authentication. But it is not
enabled. Does this mean ntp4 need it in default?

assID=0 status=0644 leap_none, sync_ntp, 4 events, event_peer/
strat_chg,
version="ntpd 4.2.4p5@beijing-o Sep 01 9:15:56 (UTC+02:00) 2008
(10)",
processor="unknown", system="WINDOWS/NT", leap=00, stratum=6,
precision=-20, rootdelay=0.304, rootdispersion=58.322, peer=46864,
refid=10.200.98.51,
reftime=ccb22e3c.45338a42  Tue, Oct 28 2008 17:35:08.270, poll=6,
clock=ccb22eb8.2242d2bb  Tue, Oct 28 2008 17:37:12.133, state=4,
offset=-33.131, frequency=-47.242, jitter=10.226, noise=21.119,
stability=0.104, tai=0

If you have any w32time servers upstream of you, please note that
w32time doesn't honour the maximum distance heuristic, so will report a
low stratum number even when the root dispersion is impossibly high,
because the server hasn't been synchronised for many days, e.g we have
one in the office that is reporting stratum three, even though it has
not been synchronised for so long that the time is almost 7 seconds out.

w32time has been disabled on all windows based computer, no matter
server or client. I have tested ntpd in pure linux environment before,
both server/client are linux, and have no internet connection. It
seems clients can find the server has untrusted time and refuse to
sync with it after running a period of time(about 1 day).
server, I did not know which time the client  followed.  So add
127.127.1.0, just make sure the client sync to its own clock. At
Clients are ALWAYS synchronised to their own clock (for NTPv4)!

.

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