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List:       orinoco-users
Subject:    Re: [Orinoco-users] Differences in iwspy !! (fwd)
From:       Vikram KAUL <vkaul () research ! telcordia ! com>
Date:       2005-11-29 23:19:29
Message-ID: Pine.WNT.4.60.0511291817580.600 () vkaul-1 ! dte ! telcordia ! com
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Hi all,

  Thanks for the reply. I just tried the hostap_cs driver and that seems to
give believe-able results. On a side note, I would much rather use orinoco
for all the work. Please give your inputs on whether I am in the right
direction. This is different than the iwspy issue

  Specifically,
Does the orinoco driver only forward DATA packets in standard mode ?
Does the orinoco driver forward all (DATA, MGMT, CTL) in monitor mode only ?
I can see that in
static void orinoco_rx_monitor(...) in orinoco.c
Can I send CTL packets in standard mode ?

If I have to build some kind of acknowledgement on the
multicast/broadcast, and if I can't send CTL packets in standard mode,
do I have to build the ack as a broadcast DATA packet ?

Any help you would provide will be helpful

regards..
Vikram

On Wed, 23 Nov 2005, Pavel Roskin wrote:

proski>Date: Wed, 23 Nov 2005 17:19:59 -0500
proski>From: Pavel Roskin <proski@gnu.org>
proski>To: Vikram KAUL <vkaul@research.telcordia.com>
proski>Cc: orinoco-users@lists.sourceforge.net
proski>Subject: Re: [Orinoco-users] Differences in iwspy !!
proski>
proski>Hello!
proski>
proski>On Wed, 2005-11-23 at 14:56 -0500, Vikram KAUL wrote:
proski>> Hi Folks,
proski>>
proski>>   I have the same laptop running two different cards with two different
proski>> drivers:
proski>>
proski>> eth0:  Lucent Orinoco Gold               -> "orinoco-0.15rc3" driver
proski>> wlan0: Linksys WCF12 with pcmcia adapter -> "linux-wlan-ng-0.2.2"
proski>
proski>It would be more useful if you used different drivers with the same
proski>card.  I think Linksys WCF12 should work with both drivers.
proski>
proski>> Both belong to the same ad-hoc group and are "iwspy"ing two other nodes
proski>> which belong to the same ad-hoc group as well. A broadcast ping with 200ms
proski>> interval ensures 'freshness' of the iwspy measurements. Here is what I
proski>> see:
proski>>
proski>> wlan0     Statistics collected:
proski>>      00:02:2D:64:5A:55 : Quality=32/92  Signal level=-100 dBm  Noise level=-132 dBm
proski>>      00:02:2D:64:5A:4B : Quality=36/92  Signal level=-96 dBm  Noise level=-132 dBm
proski>>      Link/Cell/AP      : Quality=0/92  Signal level=-100 dBm  Noise level=-100 dBm
proski>>      Typical/Reference : Quality:0  Signal level:0  Noise level:0
proski>>
proski>> eth1      Statistics collected:
proski>>      00:02:2D:64:5A:55 : Quality=49/92  Signal level=-42 dBm  Noise level=-91 dBm
proski>>      00:02:2D:64:5A:4B : Quality=56/92  Signal level=-39 dBm  Noise level=-95 dBm
proski>>      Link/Cell/AP      : Quality:49/92  Signal level:-42 dBm  Noise level:-91 dBm
proski>>      Typical/Reference : Quality:36/92  Signal level:-62 dBm  Noise level:-98 dBm
proski>
proski>linux-wlan-ng is almost certainly incorrect.  Signal to noise ration of
proski>1 means that you cannot transmit data.  And the noise level of -132 dBm
proski>is below the thermal noise level, I believe.
proski>
proski>I'm not saying that the Orinoco driver is definitely correct here, but
proski>its data look more reasonable.
proski>
proski>> Notice that the signal level and noise level are off by a very large
proski>> margin in the two measurements.
proski>>
proski>> Why is that ? The measurement cards are in two adjacent slots. I am seeing
proski>> this very consistently.
proski>>
proski>> I can provide more derails if anyone wanted so
proski>
proski>I think everybody can make such test.  Getting stats right is not easy
proski>because there are different firmware versions report it differently, the
proski>documentation is incomplete, and independent verification of the stats
proski>is hard.
proski>
proski>--
proski>Regards,
proski>Pavel Roskin
proski>
proski>
proski>
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