Mapping a wireless network dynamically.

[kitepilot at kitepilot.com]

Oops...
I forgot to say that I don't have the IP address of the attached device.
I have ALL IP addresses, but I don't know whom is attached to whom...
And yes, I can control the setup, but my ultimate goal is to manage less. 

The only way I see this possible, is by broadcasting "something" to the 
wire, that doesn't go beyond the next radio, and returns the MACs of the 
"wired" devices.
Thanks!
ET 

 

 

Tony Wasson writes: 

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