Cisco NTP issues

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Aug 7th, 2009
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Hello all. I have a Cisco 2811 router on a lan network. I have NTP turned on on this machine, and have assigned a valid NTP server that another edge router we have uses. Internally, local machines asking this router for NTP get results just fine. However, I have several remote locations that need to be able to ask this router for NTP and get it. So far, no remote location is getting NTP from the router.

On a linux machine, I get the following message:

7 Aug 13:21:19 ntpdate[15929]: no server suitable for synchronization found

The router is synchronized though.

Clock is synchronized, stratum 8, reference is

nominal freq is 250.0000 Hz, actual freq is 249.9942 Hz, precision is 2**18

reference time is CE26E447.CA44C60F (13:35:03.790 EST Fri Aug 7 2009)

clock offset is 0.0000 msec, root delay is 0.00 msec

root dispersion is 0.02 msec, peer dispersion is 0.02 msec

Any help would be appreciated.

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Joe Clarke Fri, 08/07/2009 - 09:43
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Make sure udp/123 is permitted between your router and your remote locations.

dj_oberry Fri, 08/07/2009 - 09:50
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Thanks, that wasn't the issue, but it helped me find the issue while check for that. Apparantly my router wasnt receiving its ntp from the server I requested. It was trying to use itself. I removed all NTP information and redid it, and that fixed the problem.


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