02-15-2010 09:32 AM
I am trying to syncronice my pc to a ntp server, but the "debug ntp" show:
Feb 15 18:24:46.448: NTP: packet from 10.10.10.1 failed validity tests 64
Feb 15 18:24:46.448: Peer/Server Clock unsynchronized
Feb 15 18:24:46.448: Peer/Server Stratum out of bound
NTP configuration is:
ntp clock-period 17182124
ntp source Vlan901
ntp master 4
ntp update-calendar
ntp server X.X.X.X (a real ntp server)
Why?
Thanks.
Solved! Go to Solution.
02-19-2010 07:49 AM
This doesn't appear to be a capture of traffic between the router in question and the client. This capture looks good. Time is being properly synchronized.
02-15-2010 06:00 PM
Your peer's stratum is greater than 4. Make sure you're NTP server peer has a stratum less that your desired stratum of 4, and the clock should synchronize.
02-16-2010 03:08 AM
My Cisco synchronize ok with its ntp server (it´s stratum 2). The problem is other: i need that all servers in my company synchronize with my Cisco. I explain: i need that a pc synchonize with a Cisco Router, and this Cisco Router syncrhonize with other ntp server. The Cisco Router synchonize ok, but pcs not.
Cisco Router Configuration:
ntp clock-period 17183677
ntp source Vlan901
ntp master 4
ntp update-calendar
ntp server x.x.x.x (it's ntp server)
is this configuration wrong?
thanks
02-16-2010 10:51 AM
Are you sure your PCs can access the router on udp/123? That is, if you start a sniffer trace on one of your clients filtering on udp/123 traffic, what do you see?
02-16-2010 11:13 PM
My Pc access the router on udp/123 and synchronize, but he "debug ntp" on Cisco router is:
Feb 15 18:24:46.448: NTP: packet from 10.10.10.1 failed validity tests 64 (10.10.10.1 is my pc)
Feb 15 18:24:46.448: Peer/Server Clock unsynchronized
Feb 15 18:24:46.448: Peer/Server Stratum out of bound
Is it normal?
Thanks
02-17-2010 08:18 AM
Post the output of "show ntp stat" from this router. What version of IOS is it running?
02-18-2010 06:23 AM
# show ntp status
Clock is synchronized, stratum 3, reference is 10.252.120.5
nominal freq is 250.0000 Hz, actual freq is 249.8740 Hz, precision is 2**24
reference time is CF27CB30.BFBE78D8 (15:20:32.749 GMT Thu Feb 18 2010)
clock offset is 5.7081 msec, root delay is 5.91 msec
root dispersion is 33.17 msec, peer dispersion is 4.71 msec
Version 12.2(17r)SX5, RELEASE SOFTWARE (fc1)
02-18-2010 08:10 AM
what operatings system does the PC have ? What does the NTP configuration looks like on the PC?
The debug message sounds a bit like your PC wants to update the router and the packet is rejected... (because your PC is unsynchronized...)
have you tried the packet capture jclarke suggested? If yes, could you post the capture here?
02-19-2010 03:02 AM
02-19-2010 07:49 AM
This doesn't appear to be a capture of traffic between the router in question and the client. This capture looks good. Time is being properly synchronized.
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