RE: MORE: Tools for Detecting Wireless APs - from the wire side.

["R. DuFresne" <dufresne () sysinfo com>]

On Tue, 11 Jun 2002, John Adams wrote:

> On Tue, 11 Jun 2002, ed d wrote:
>
> > depending on how the clients in your network get their ip addresses, you
> > might be able to search through your dhcp logs and pull all of the ap mac
> > addresses.
> >
> > this discounts rogue aps with statics, but if i was to drop a rogue ap into
> > a network, i would probably turn on dhcp, then let it go.
>
> Ahh, but this is useless if the AP DHCPs an address and then NATs everyone
> on wireless.
>
> > a good site for mac address/vendor coorelation is:
> > http://standards.ieee.org/regauth/oui/oui.txt
>
> I disagree with the entire "find them by Vendor MAC prefix to find APs"
> approach. Many vendors are assigned blocks of MAC prefixes (look at Cisco,
> for example) and share these blocks between disparate devices, both wired
> and wireless.

Actually, I believe they are assigned a number of MAC blocks over time,
thus a search of 3Com MAC's should produce a number of MAC blocks.

http://www.codito.de/manufactor_hash

http://coffer.com/mac_find/

   00068C       3Com Corporation
   000A04       3Com Europe Ltd
   00104B       3com corporation
   00105A       3com corporation
   0020AF       3COM Corporation
   00301E       3COM Europe Ltd.
   005004       3COM CORPORATION
   005099       3com europe, ltd.
   0050DA       3COM CORPORATION
   006008       3com corporation
   00608C       3Com (1990 onwards)
   006097       3Com
   009004       3com europe ltd.
   00A024       3com Corporation
   00D096       3com Europe Ltd.
   00D0D8       3Com Corporation (was: Nomadic Technologies)
   026060       3COM
   02608C       3COM IBM PC; Imagen; Valid; Cisco; Macintosh; Apple
   02C08C       3com corporation
   080002       Bridge (was: 3Com)
   08004E       3com europe ltd.
   3C0000       3Com dual function (V.34 modem + Ethernet) card



Thanks,

Ron DuFrense
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