I've found that I have 2 Elevated clients that are using the same MAC address (02:C9:00:00:00:00) on the management side of the connection. We use a management VLAN on the AP & SM and the SM get a management IP address assigned from the DHCP server (Mikrotik). Since both SM are using the same MAC address the DHCP server is handing them the same management IP address - 10.99.3.148.
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To test/verify I set a static DHCP lease for that mac address at 10.99.3.158 and rebooted just one of the SM to force the SM to request a DHCP lease. The rebooted SM did grab the static lease of 10.99.3.158.
So now I had one SM a 10.99.3.148 and the other at 10.99.3.158, however both have the same MAC address as shown in the screen shot of the ARP table of the router.
After a few minutes the SM that wasn't rebooted refreshed it's DHCP lease and changed from 10.9.33.148 to 10.99.3.158 as well as shown in the screen shot from the wireless table of the AP.
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I also included screen shots from the SM's showing that they have different hardware mac addresses.
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Both SM's started at 3.4.1, however for testing I upgraded one SM to 3.5 to see if the MAC would change (I assume its a calculated value or random)
- epmp_dup_arp.jpg (223 KB)
- cust1.png (78.6 KB)
- cust2.jpg (199 KB)
- fromAP.jpg (32.2 KB)