Hello There

We are seeing an issue that looks not normal, same MAC address registered twice in the same AP on different WLAN, our AP are running OS 4.11 and this seeing on three different AP so far.

See attached screen shots.

???????

If you copy a config from one CPE into another, the wireless MAC address may also go with it. The MAC address of the wireless interface can actually be changed via winbox or the CLI.
Or try to pop a new terminal window and use this:

> interface wireless print
Flags: X - disabled, R - running
0 R name="r5h-1" mtu=1500 mac-address=00:0C:42:60:F3:C7 arp=enabled
interface-type=Atheros AR5413 mode=station-wds

If the MAC addresses of the wireless cards are the same but the ethernet MAC's are different, you have copied the wireless MAC into another radio unknowingly. Easy enough to fix but you have to know what the proper MAC should be. It should be printed on the card itself but then you have to go replace the CPE, unless you keep records of which radio card goes into which RouterBoard.

To change the MAC address via Winbox, just select the MAC Address field and enter the correct address.

To change via CLI, use:

> int wireless set 0 mac-address=XX:XX:XX:XX:XX:XX

where XX:XX:XX:XX:XX:XX is the correct MAC address.

Note that if you are using MAC addresses for authentication, you will have to change your entry for that user in your Access List/User Manager/Radius server.

If the above is not the issue, does it still appear if you close and re-open winbox?

If you copy a config from one CPE into another, the wireless MAC address may also go with it. The MAC address of the wireless interface can actually be changed via winbox or the CLI.

If you change mac address will you not lose connectivity as the new mac address will not auto reassociate with the AP ?