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I administrate a network that has 20+ Cisco Aironet 1200 series WAPs. They get a reserved IP from a Server 2008 R2 DHCP box. I have been seeing some weird traffic on the network, and have finally been able to track it down to 3 of the WAPs that seem to be having some sort of DHCP error--I see the following error messages in the DHCP audit log:

15,05/23/11,00:01:21,NACK,192.168.xxx.xxx,Hostname,MAC,,0,6,,,

I also see corresponding traffic when I fire up Wireshark. When I set the IP as static instead of a reservation, I dont get the error, and everything works fine.

Any ideas on what is going on?

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Have these particular APs ever been able to pull DHCP addrs? Have you tried assigning a different address for their mac-addrs on the server? –  Mike Pennington May 24 '11 at 10:18
    
Yes, they can pull non-reserved DHCP addrs just fine. When I try to assign a different IP for their mac-addr I get an "unknown" error on the DHCP server.... So I'm thinking it must be some type of error with the DHCP server... –  Josh Brower May 24 '11 at 12:38
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