Thanks for the reply Shieva. No, this is not an Instant AP configuration; this is a wireless controller based network. Out of curiosity, how, or why, is the mac-address being "swapped"? Could this be due to one or both of the DHCP servers not being configured correctly? I know there are two IP helper addresses configured on the Layer 3 VLAN. The way I understand it, the client DHCP request from the AP is forwarded to the first configured IP helper address. The second IP helper address is the "backup" DHCP server should the first one not be online. Other than the standard information configured for a DHCP scope and option 43 (ip address of the master controller) and option 60 (ArubaAP). I believe two DHCP servers are configured to provide fault tolerance and possibly some load balancing but I may have to ask the server folks more about the DHCP configuration as I suspect something is not configured correctly. It's just weird how mac-addresses are being "swapped".