Return-path: Received: from mail-fx0-f158.google.com ([209.85.220.158]:36870 "EHLO mail-fx0-f158.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753865AbZDBOn5 (ORCPT ); Thu, 2 Apr 2009 10:43:57 -0400 Received: by fxm2 with SMTP id 2so560935fxm.37 for ; Thu, 02 Apr 2009 07:43:55 -0700 (PDT) MIME-Version: 1.0 Date: Thu, 2 Apr 2009 22:43:54 +0800 Message-ID: <5135d20a0904020743k1bbc824te7805bcd8d683058@mail.gmail.com> (sfid-20090402_164400_843467_44D5EF78) Subject: the meaning of DS Parameter set current channel From: fengzeheng To: wireless Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: hi, all I have a marvell chipset. It generate probe request with random Ds parameter--current channel. My sniffer card is working at channel 11 and capture marvell chipset's packets. I found that marvell send probe request with current working channel number 2,3,6,36...., It looks like a random number. shouldn't this parameter be set to 11 ? as we sniffer at channel 11 so that what we can hear should work at channel 11. and I capture other intel/d_link card , and their probe request don't include this mgmt parameter. according ieee 802.11--2007, DS parameter set IE current channel parameter indicate STA's current working channel. So I guess DS paramter set current channel should always be 11 as marvell was working at this channel. but it's seem ramdom. what's the meaning of this parameter? does chipset can set it not the same as current working channel? if AP recieve a probe request which has a current channel not same as current working channel , how to deal with it ? thanks -- Best Regards Feng zeheng