I have a Cisco 2106 WLC in DHCP Relay mode. For some reason, all of the clients that attach to the network via WiFi get an IP Conflict notification, even though the IP address is not in conflict (they're all unique, and the next available on the DHCP server). I can't figure out if the problem is related to my Windows 2008 DHCP server, or the WLC. They are all using the same subnet (192.168.48.xxx). I'm not even sure how to begin tracing the problem.
I'm sure I will need to provide more info, which I'm willing to do. I'm just not sure where to start. I really appreciate any help given. We are a small non-profit, and it's great to have the forums available as a resource.
When i have issues like this myself. I would extended the vlan to a wired port. Plug in your laptop into the switch and see what happens.
So the client is saying there is a conflict ? What type of NIC and are they ALL doing it ?