Mapping a wireless network dynamically.

So I want to map my network "on the fly".
This is what I already know:
Radios are Wiligear (embedded Linux)
I have a script that logs in into every radio and downloads its
configuration file, MAC and IP address.

From the configuration file I can tell APs from bridges.

I can login in every AP and grab the list of MAC addresses associated to
that AP.
I can find the corresponding IP address of a MAC with a lookup into the ARP
table of the firewall.
Now I can login to those bridges too.
So far so good...

Now the challenge:
When I login to the bridge, I need to know the MAC address of the device
attached to the eth0 interface.
How do I find the MAC address of the device in the other side of the wire?
Thanks!
ET

PS: Message kept succinct for practicality, please feel free to ask
questions like:
"what else do we have available?"
Well, SNMP, but can it be used for this?
It's Linux, give me your wish list... :)
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