Full Disclosure mailing list archives
RE: WiFi question
From: "Todd Towles" <toddtowles () brookshires com>
Date: Fri, 19 Nov 2004 12:43:38 -0600
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 () lists netsys com [mailto:full-disclosure-admin () lists netsys com] On Behalf Of Paul Schmehl Sent: Friday, November 19, 2004 10:51 AM To: Lachniet, Mark Cc: full-disclosure () lists netsys com Subject: RE: [Full-disclosure] WiFi question --On Thursday, November 18, 2004 09:32:27 AM -0600 Paul Schmehl <pauls () utdallas edu> wrote:--On Wednesday, November 17, 2004 12:41:44 PM -0500 "Lachniet, Mark" <mlachniet () 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 aFAKEAP programalso. I would assume the same could happen with otherinterference.Having a common SSID would seem to indicate this is notthe 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 () utdallas edu) Adjunct Information Security Officer The University of Texas at Dallas AVIEN Founding Member http://www.utdallas.edu _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
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Current thread:
- RE: WiFi question, (continued)
- RE: WiFi question Paul Schmehl (Nov 18)
- RE: WiFi question Paul Schmehl (Nov 19)
- Re: WiFi question Esmond (Nov 19)
- RE: WiFi question Ake Nordin (Nov 21)
- RE: WiFi question Paul Schmehl (Nov 22)
- RE: WiFi question Ron DuFresne (Nov 22)
- RE: WiFi question Colin . Scott (Nov 23)
- RE: WiFi question Paul Schmehl (Nov 18)