Wireless tools: signal strength?

[Martin Schiotz]

I will be looking forward for the new driver version. 
Thanks!

Best Regards 
Martin Schiøtz
> 
> It's an option that can be passed to the card (to choose between active
> and passive scanning.) Unfortunately, it's not implemented yet :(. I'm
> working on a new version of the driver(s), should be out by a couple of
> weeks.
> Best,
> 	Moustafa
> >
> > Actually, I want to get the signal strength calculated from beacon frames from access points in range.
> > I believe this must be done with a passive scan. I only want to scan for short periode of time and still keep the connection to the infrastructure BSS (Just like it is done when using the iwlist command). Is this possible with any Orinoco (or other product) driver or do I have to do a lot of c programming to obtain this ?
> >
> > Moustafa, thanks for your reply. I'm actually using your mwavelan_cs driver and mapi and it's a very nice driver.
> >
> > Best regards,
> > Martin Schiotz
> >
> >
> > > Date: Tue, 25 Feb 2003 12:15:07 -0500 (EST)
> > > From: "Moustafa A. Youssef" <moustafa at cs.umd.edu>
> > > To: <wireless at lists.samba.org>
> > > Subject: RE: Wireless tools: signal strength?
> > > Message-ID: <Pine.LNX.4.33.0302251211550.7715-100000 at utz.cs.umd.edu>
> > > In-Reply-To: <20030225120349.58D1D2C702 at lists.samba.org>
> > > Content-Type: TEXT/PLAIN; charset=US-ASCII
> > > MIME-Version: 1.0
> > > Precedence: list
> > > Message: 1
> > >
> > > > Date: Mon, 24 Feb 2003 20:33:42 +0100
> > > > From: maline at post.cybercity.dk (Martin Schiotz)
> > > > To: wireless at lists.samba.org
> > > > Subject: Wireless tools: signal strength?
> > > > Message-ID: <3e5a73965231d8.71523290 at not right>
> > > > Content-Type: text/plain; charset="iso-8859-1"
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> > > > Reply-To: maline at post.cybercity.dk
> > > > Message: 1
> > > >
> > > >
> > > > Hi,
> > > >
> > > > I'm using wireless tools v.25 on my Linux laptop with a wireless Orinoco pcmcia card. I use the commands iwlist or iwspy to get the signal strength from all access points in range.
> > > >
> > > > My question is, if the signal strengths I get from these commands are calculated from beacon frames which is send out by all access points all the time as part of 802.11. Which means that no packages are send from my laptop to obtain the signal strengths?
> > > >
> > > > Best regards,
> > > > Martin Schiotz
> > > >
> > >
> > > Beacons frames are usually sent every 102 ms (a configurable parameter).
> > > However, the way that scanning work is by sending a probe request message
> > > and waiting for a probe response (similar to the beacon frames). You can
> > > control the spacing between these probe requests by controlling the
> > > frequency of calling iwlist command. So you still has some time to send
> > > some data.
> > >
> > > Best,
> > > 	Moustafa
> > >
> > > ------------------------------