It seems the firewall blocking UDP 123
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NTP status reports clock unsynchronized after setting NTP paramenters in Cisco router
The following instructions were set on the router
clock timezone GMT -4
ntp server 129.6.15.28
But the sh ntp status saids that the clock is unsynchronized.
CORE1#sh ntp assoc
address ref clock st when poll reach delay offset disp
~129.6.15.28 0.0.0.0 16 - 64 0 0.0 0.00 16000.
* master (synced), # master (unsynced), + selected, - candidate, ~ configured
CORE1#
CORE1#
CORE1#sh ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**18
reference time is 00000000.00000000 (20:00:00.000 GMT Thu Dec 31 1899)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.00 msec, peer dispersion is 0.00 msec
CORE1#
What I'm doing wrong?
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Answers
Well,
While waiting for the sec-admin to take action, I took another route and decide to use other of the internal routers that has access to the Internet as a ntp server, using the ntp master command. This time the clock was synchronized. So it seems that you were right about udp 123 being blocked by the firewall. No other parameters in the configuration are affecting the time synchronization.
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by: wiscomPosted on 2009-08-20 at 07:44:49ID: 25143155
Hi,
Ping from CORE1 to the NTP server.
If you got a reply see if there are filters in the path which are blocking UDP port 123
A/