ARP resolves wrong MAC Address

RouterOS General
1

This is weird. I have a hotspot bridge shows this ARP entry (192.168.88.75 → 00:0C:42:4F:E7:5E)
MAC1.png
However that is wrong. This seems to happen to APs when the bridge interface IP. The actual MAC address: 00:0C:42:64:BF:82 (as is the admin-mac)
mac2.png
If I delete the ARP entry out of the hotspot bridge it comes back. If I look for 00:0C:42:4F:E7:5E in the Forward-FDB unicast table on the attached CRS125 switch I cannot find it, but I can see 00:0C:42:64:BF:82.

Essentially where could this ARP entry be learned from?

2

SOLVED

But I’m not sure I know why. This is a hotspot setup and the device was assigned a hotspot host mapping to another IP. This meant that the ARP was resolving the MAC to the mapped IP from the hotspot system.

Those IPs are normally bypassed?

Anyway, if any APs come up in CAPsMAN as “MI” look at your hosts list and see if any of them have IP mappings there that don’t make sense. Hope this helps someone… :slight_smile: