[ntp:questions] NTP server can not synchronize with external NTP server

nast linux nastlinux at gmail.com
Thu Jan 7 03:41:35 UTC 2010


Dear All,

I got the problem, my NTP server can not synchronize with external NTP
server.

*root at ntpserver:~# ntpdate -d 2.id.pool.ntp.org
 7 Jan 10:24:37 ntpdate[1779]: ntpdate 4.2.4p6 at 1.1549-o Thu Oct 22 21:58:39
UTC 2009 (1)
transmit(110.92.72.250)
transmit(202.162.32.12)
transmit(110.92.72.250)
transmit(202.162.32.12)
transmit(110.92.72.250)
transmit(202.162.32.12)
transmit(110.92.72.250)
transmit(202.162.32.12)
transmit(110.92.72.250)
transmit(202.162.32.12)
110.92.72.250: Server dropped: no data
202.162.32.12: Server dropped: no data
server 110.92.72.250, port 123
stratum 0, precision 0, leap 00, trust 000
refid [110.92.72.250], delay 0.00000, dispersion 64.00000
transmitted 4, in filter 4
reference time:    00000000.00000000  Thu, Feb  7 2036 13:28:16.000
originate timestamp: 00000000.00000000  Thu, Feb  7 2036 13:28:16.000
transmit timestamp:  ceefd27a.26281344  Thu, Jan  7 2010 10:24:42.149
filter delay:  0.00000  0.00000  0.00000  0.00000
         0.00000  0.00000  0.00000  0.00000
filter offset: 0.000000 0.000000 0.000000 0.000000
         0.000000 0.000000 0.000000 0.000000
delay 0.00000, dispersion 64.00000
offset 0.000000

server 202.162.32.12, port 123
stratum 0, precision 0, leap 00, trust 000
refid [202.162.32.12], delay 0.00000, dispersion 64.00000
transmitted 4, in filter 4
reference time:    00000000.00000000  Thu, Feb  7 2036 13:28:16.000
originate timestamp: 00000000.00000000  Thu, Feb  7 2036 13:28:16.000
transmit timestamp:  ceefd27a.595aaf78  Thu, Jan  7 2010 10:24:42.349
filter delay:  0.00000  0.00000  0.00000  0.00000
         0.00000  0.00000  0.00000  0.00000
filter offset: 0.000000 0.000000 0.000000 0.000000
         0.000000 0.000000 0.000000 0.000000
delay 0.00000, dispersion 64.00000
offset 0.000000

 7 Jan 10:24:43 ntpdate[1779]: no server suitable for synchronization found
root at ntpserver:~#

root at ntpserver:~# ntpq -p
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 time.ntp-ix.net .INIT.          16 u    -   64    0    0.000    0.000
0.000
 suisho.attritio .INIT.          16 u    -   64    0    0.000    0.000
0.000
 122.226.192.4   .INIT.          16 u    -   64    0    0.000    0.000
0.000
root at ntpserver:~# *

Below is configuration on ntp.conf

*# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

logfile /var/log/ntpd
driftfile /var/lib/ntp/ntp.drift


# Enable this if you want statistics to be logged.
statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable


# You do need to talk to an NTP server or two (or three).
#server ntp.ubuntu.com

server 2.id.pool.ntp.org
server 1.asia.pool.ntp.org
server 0.asia.pool.ntp.org


# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html
for
# details.  The web page <
http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a
configuration
# that might be intended to block requests from certain clients could also
end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery



# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1
# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust


# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment
the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient
*
Below is content of /var/log/ntpd

*7 Jan 10:24:18 ntpd[1746]: ntpd exiting on signal 15
 7 Jan 10:26:07 ntpd[1791]: frequency initialized 0.000 PPM from
/var/lib/ntp/ntp.drift*

How to solve the problem?
How to make sure more that my NTP server have run normally, besides my
method above?

Thanks,
nast



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