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Thank you both for getting back to me. &nbsp;<br />
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1. &nbsp;I am sure it is NTP. &nbsp;I can see the NTP traffic (UDP port = 123) when I sniff the traffic on the vlans using Wireshark. &nbsp; <br />
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2. &nbsp;I know the NTP packets passed the routers because I can follow them from the source all the way to the default router. &nbsp; I just don't know why these particular NTP traffic won't show on the router when I use debug. &nbsp;These are no ACLs applied to the routers. &nbsp; <br />
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Any more ideas? &nbsp; &nbsp;<br />
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&nbsp; 
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Thank you both for getting back to me.  

1.  I am sure it is NTP.  I can see the NTP traffic (UDP port = 123) when I sniff the traffic on the vlans using Wireshark.  

2.  I know the NTP packets passed the routers because I can follow them from the source all the way to the default router.   I just don't know why these particular NTP traffic won't show on the router when I use debug.  These are no ACLs applied to the routers.  

Any more ideas?    

 

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Never figured it out, but will award the points anyway since they tried. &nbsp; 
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Never figured it out, but will award the points anyway since they tried.  

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I am troubleshooting NTP issues between my server and outside time providers. &nbsp;When I turn on debug using &quot;debug IP UDP&quot; on the router, I see some UDP traffic, but no NTP. &nbsp;When I sniff on the vlans, I do see the NTP packets on both sides of the router. &nbsp;Can someone please explain why the NTP packets won't show up on my router's debug output? &nbsp;Is it something I need to do on the router? &nbsp;Thank you. &nbsp;<br />
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I am troubleshooting NTP issues between my server and outside time providers.  When I turn on debug using "debug IP UDP" on the router, I see some UDP traffic, but no NTP.  When I sniff on the vlans, I do see the NTP packets on both sides of the router.  Can someone please explain why the NTP packets won't show up on my router's debug output?  Is it something I need to do on the router?  Thank you.  
 

Why can't I see NTP traffic passing through my router using debug?

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.