On Tue, Apr 14, 2009 at 10:52 AM, kitepilot@kitepilot.com
<kitepilot@kitepilot.com> wrote:
> 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

SNMP can help here. See if you can snmpwalk the units. (change the IP
and community name)

$ snmpwalk -v1 -c your-community-name 192.168.1.50 1.3.6.1

On a typical SNMP device you can get the forwarding tables like so:

$ snmpwalk -v1 -c your-community-name 192.168.1.50 1.3.6.1.2.1.17.4.3.1.2

You can usually tie that information together with the interface names
located at this OID:
1.3.6.1.2.1.2.2.1.2

I've got a script that will dump the mappings I can share offlist if
you're interested. I use it to dump all the MAC to port mappings into
a database table and then generate a map. If that isn't working, you
could also dump the arp tables of the WiFi units periodically. Doing
that in conjuction with an nmap ping sweep will allow you to "find" a
good chunk of devices.

Hope this helps,
Tony Wasson
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