Detection of Rogue Access Points
ops.lists at gmail.com
Mon Oct 15 00:36:50 UTC 2012
restricting the number of mac addresses per switch port to one for your
dhcp pool too, though more than one ap clones mac addresses. and make it
unpopulr for the usual use cases by firewalling off stuff like dropbox,
siri and icloud.
there is of course commercial wips gear like this ..
On Monday, October 15, 2012, Jonathan Lassoff wrote:
> This is actually a really tough problem to solve without either total
> dictatorial control of your switchports or lots of telemetry and
> At $DAYJOB, we detect the transparent bridge case by having a subset
> of AP hardware setup as "monitors" that listen to 802.11 frames on the
> various channels, keeping a log of the client MAC addresses and the
> BSSID that they're associated with.
> Then, by selecting out only those client MAC addresses that are not
> associated to a known BSSID that we control, we compare that set of
> "unknown" client MAC addresses to the Ethernet L2 FIBs on our switches
> and look for matches.
> If we see entries, than there is some 802.11 device bridging clients
> onto our network and we hunt it down from there.
> I've yet to see a solid methodology for detecting NATing devices,
> short of requiring 802.1x authentication using expiring keys and
> one-time passwords. :p
Suresh Ramasubramanian (ops.lists at gmail.com)
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