From: Luciano Coelho <luciano.coelho@nokia.com>
To: ext Chuck Crisler <ccrisler@vgocom.com>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: Re: active vs. passive scans
Date: Mon, 27 Sep 2010 18:06:04 +0300 [thread overview]
Message-ID: <1285599964.5768.120.camel@chilepepper> (raw)
In-Reply-To: <15713CDD627C41D39E4B9725AE2B241D@ChuckPC>
Hi Chuck,
On Mon, 2010-09-27 at 16:03 +0200, ext Chuck Crisler wrote:
> How to you get the supplicant/linux wireless to perform active scans rather
> than passive scans? Are active scans faster?
We do active scans by default, unless specified otherwise in the
regulatory database.
The main difference between active and passive scans is that in active
scans we send broadcast probe requests on the channel and with passive
we don't. In passive scan we just listen to beacons.
Usually the drivers stay for a certain period of time in each channel,
and that normally doesn't change if you have active or passive scan. So
there will be no improvement in the overall scan speed. Of course you
could do some tweaks that might improve scanning performance in specific
cases.
--
Cheers,
Luca.
next prev parent reply other threads:[~2010-09-27 15:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-27 14:03 active vs. passive scans Chuck Crisler
2010-09-27 15:06 ` Luciano Coelho [this message]
2010-09-27 15:09 ` Johannes Berg
2010-09-27 16:32 ` Luciano Coelho
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