Return-path: Received: from mail2.candelatech.com ([208.74.158.173]:39462 "EHLO mail2.candelatech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751085AbcIOQDY (ORCPT ); Thu, 15 Sep 2016 12:03:24 -0400 Subject: Re: Using ath5k/ath9k radio for constant-tx noise source. To: Bob Copeland References: <55D4D406.5000603@candelatech.com> <55D5EE0E.3020408@neratec.com> <6d50965d-af35-dad9-23fe-162678a0f02f@candelatech.com> <20160915132601.GC4475@localhost> Cc: Zefir Kurtisi , "linux-wireless@vger.kernel.org" , Christian Lamparter From: Ben Greear Message-ID: <1241465a-bea6-2452-3943-c95c8110ae69@candelatech.com> (sfid-20160915_180328_292446_27EF8C4B) Date: Thu, 15 Sep 2016 09:03:23 -0700 MIME-Version: 1.0 In-Reply-To: <20160915132601.GC4475@localhost> Content-Type: text/plain; charset=windows-1252; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: On 09/15/2016 06:26 AM, Bob Copeland wrote: > On Wed, Sep 14, 2016 at 05:22:46PM -0700, Ben Greear wrote: >> On 08/20/2015 08:11 AM, Zefir Kurtisi wrote: >>> On 08/19/2015 09:07 PM, Ben Greear wrote: >>>> I have a commercial AP that is using a CM9 ath5k radio (evidently, I could be wrong) >>>> and it has the ability to do a constant transmit of raw noise (RF probe shows >>>> noise, but a monitor-port sniffer does not see any frames from the CM9). >>>> >>>> I don't know the low-level details of how it is doing this, but I suspect >>>> it is using something like madwifi for a driver. >>>> >>>> Does anyone know how this can be done with modern software and >>>> ath5k or ath9k NICs? > > Hi Ben, > > I wrote some code to do this on ath5k -- I can post a patch if you're > interested in using ath5k for this. > > Here's a snapshot of what it looks like when running on ch.1: > > https://bobcopeland.com/images/speccy-testmode.png > I would be interested in seeing those patches. ath5k is probably cheaper and easier to find than carl9170 nics. Personally, such patches for ath9k would be best, but ath5k is still interesting. Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com