Return-path: Received: from mail-iy0-f174.google.com ([209.85.210.174]:58528 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755190Ab1BGXxm convert rfc822-to-8bit (ORCPT ); Mon, 7 Feb 2011 18:53:42 -0500 Received: by iyj8 with SMTP id 8so2719323iyj.19 for ; Mon, 07 Feb 2011 15:53:41 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <4D505DDD.8050805@candelatech.com> 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> From: Daniel Halperin Date: Mon, 7 Feb 2011 15:53:21 -0800 Message-ID: Subject: Re: Scanning and channel types. To: Ben Greear Cc: j@w1.fi, Felix Fietkau , "linux-wireless@vger.kernel.org" Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: 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. Dan