From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.candelatech.com ([208.74.158.172]:54222 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754212Ab1BHAjA (ORCPT ); Mon, 7 Feb 2011 19:39:00 -0500 Message-ID: <4D50909B.1020005@candelatech.com> Date: Mon, 07 Feb 2011 16:38:51 -0800 From: Ben Greear MIME-Version: 1.0 To: Daniel Halperin CC: j@w1.fi, Felix Fietkau , "linux-wireless@vger.kernel.org" Subject: Re: Scanning and channel types. References: <4D4EF004.3040109@candelatech.com> <4D4EF99D.5020601@openwrt.org> <4D4EFC76.6090000@candelatech.com> <4D4EFD87.4010005@openwrt.org> <4D4EFF68.9060101@candelatech.com> <4D4F0D83.4040401@candelatech.com> <4D4F0DFF.9010703@openwrt.org> <4D5033DE.4070701@candelatech.com> <4D50503E.4090007@candelatech.com> <4D505DDD.8050805@candelatech.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: On 02/07/2011 03:53 PM, Daniel Halperin wrote: > On Mon, Feb 7, 2011 at 1:02 PM, Ben Greear wrote: >> On 02/07/2011 12:10 PM, Daniel Halperin wrote: >>> >>> On Mon, Feb 7, 2011 at 12:04 PM, Ben Greear >>> wrote: >>>>> >>>>> Start on 5 GHZ AP with HT Only set. Scan. What rate are probes sent >>>>> at for 2.4 GHz? >>> >>> No HT20 is not the same as HT-Only. I'm not sure how to set that. Jouni? >> >> I found a post from a year or so ago that indicates hostapd doesn't >> support this type of thing (that could have changed, of course). >> >> Do you know of any commercial APs that support the HT-only feature? >> (And/Or a general strategy for configuring it?) >> >>>> On 5Ghz channels, they are sent at 6Mbps >>>> On channel 3 (2.4Ghz), they are sent at 1Mbps >>>> >>>> >>>> That seem right? >>> >>> Yes, for a HT20 but not HT Only AP. >> >> Seems to me that the probe-request is to any/all APs, >> so how could we possibly know that we should send it >> at 6Mbps v/s 1Mbps until we discovered and communicated >> with it? > > Just as there are G-only APs that don't advertise 1-11 Mbps in their > beacons, there are HT-only APs that don't advertise support for 1-11 > or 6-54 Mbps in their beacons and *only* support MCS rates. Well, I don't think my changes would have made this any worse, so if it worked before, it probably still works. If anyone knows how to configure such a beast, I'll run some tests. Or, if someone else has an AP like this, please let me know if you see any problems with these patches. Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com