[Full-Disclosure] WiFi question
toddtowles at brookshires.com
Fri Nov 19 18:43:38 GMT 2004
It shouldn't take a wireless expert to tell you that...he should try it.
I pick up all types of weird stuff all the time in Kismet..and it looks
like something..but I know it isn't..the SSID is "A^B^C^B^D^S^G", or in
other words, trash.
> -----Original Message-----
> From: full-disclosure-admin at lists.netsys.com
> [mailto:full-disclosure-admin at lists.netsys.com] On Behalf Of
> Paul Schmehl
> Sent: Friday, November 19, 2004 10:51 AM
> To: Lachniet, Mark
> Cc: full-disclosure at lists.netsys.com
> Subject: RE: [Full-Disclosure] WiFi question
> --On Thursday, November 18, 2004 09:32:27 AM -0600 Paul
> Schmehl <pauls at utdallas.edu> wrote:
> > --On Wednesday, November 17, 2004 12:41:44 PM -0500 "Lachniet, Mark"
> > <mlachniet at sequoianet.com> wrote:
> >> Could also be RF interference. One of my coworkers tracked down a
> >> particularly interesting problem with motion sensor lights. Turns
> >> out the motion sensors worked at the 240mhz range, which has
> >> resonance at 2.4ghz, or something like that. Hence every time the
> >> motion sensor worked, it would spew what the wardriving
> (site survey)
> >> apps thought was a zillion different access points with widely
> >> varying MAC addresses. I would have though it was a
> FAKEAP program
> >> also. I would assume the same could happen with other
> >> Having a common SSID would seem to indicate this is not
> the problem, but just thought I'd mention it.
> > Thanks for a particularly interesting and potentially useful bit of
> > information, Mark.
> After forwarding this to our wireless expert, he responded
> with this (which he has authorized me to forward to the list.)
> I find it hard to believe that this is possible. 2.4Ghz is
> the 9th harmonic. By the time you get to the 4th harmonic of
> a signal, even in very very noisy radiators, the strength of
> the harmonic component of the signal is extremely minute.
> And, given the fact that one of those sensors (which most
> likely does *not* truly operate in the 240MHz portion of the
> spectrum) will have a very low output (Part 15 device), the
> 10th harmonic of that signal will be undetectible as it will
> be at or below the level of background noise.
> Finally, if a device managed to get past all of the
> improbabilities above, the chances of it *accidentally*
> creating a signal that looked like an
> 802.11 beacon packet, complete with preamble, header, etc is
> so off the charts as to be laughable.
> One other thing... If that device truly was operating at
> 240MHz, then the first harmonic would be 480MHz. I'm pretty
> sure that frequency lies in the public service bands (ie
> fire/police). If not, its very close. Given that and the
> fact that the first harmonic would be much stronger than the
> 9th harmonic, I'm pretty sure someone in those bands would
> have complained loudly to the FCC as they don't take
> intereference issues in those bands lightly.
> Paul Schmehl (pauls at utdallas.edu)
> Adjunct Information Security Officer
> The University of Texas at Dallas
> AVIEN Founding Member
> Full-Disclosure - We believe in it.
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