From owner-freebsd-mobile Tue Sep 10 13:18: 9 2002 Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A526337B400 for ; Tue, 10 Sep 2002 13:18:06 -0700 (PDT) Received: from mail.gmx.net (mail.gmx.net [213.165.64.20]) by mx1.FreeBSD.org (Postfix) with SMTP id 469A743E3B for ; Tue, 10 Sep 2002 13:18:05 -0700 (PDT) (envelope-from Gerhard.Sittig@gmx.net) Received: (qmail 17654 invoked by uid 0); 10 Sep 2002 20:18:03 -0000 Received: from p50910289.dip0.t-ipconnect.de (HELO mail.gsinet.sittig.org) (80.145.2.137) by mail.gmx.net (mp020-rz3) with SMTP; 10 Sep 2002 20:18:03 -0000 Received: (qmail 81364 invoked from network); 10 Sep 2002 20:11:00 -0000 Received: from shell.gsinet.sittig.org (192.168.11.153) by mail.gsinet.sittig.org with SMTP; 10 Sep 2002 20:11:00 -0000 Received: (from sittig@localhost) by shell.gsinet.sittig.org (8.11.3/8.11.3) id g8AKAwI81360 for mobile@FreeBSD.ORG; Tue, 10 Sep 2002 22:10:58 +0200 (CEST) (envelope-from sittig) Date: Tue, 10 Sep 2002 22:10:58 +0200 From: Gerhard Sittig To: mobile@FreeBSD.ORG Subject: Re: Transmitting in different channels Message-ID: <20020910221058.C94711@shell.gsinet.sittig.org> References: <009701c258c1$9373fde0$1f00a8c0@mobile> <20020910.104836.96600349.imp@bsdimp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20020910.104836.96600349.imp@bsdimp.com>; from imp@bsdimp.com on Tue, Sep 10, 2002 at 10:48:36AM -0600 Organization: System Defenestrators Inc. Sender: owner-freebsd-mobile@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Tue, Sep 10, 2002 at 10:48 -0600, M. Warner Losh wrote: > > In message: <009701c258c1$9373fde0$1f00a8c0@mobile> > "Joao Carlos" writes: > : Is it possible to use FreeBSD using two wireless cards, one as the TX > : and the other as RX? > > No. Speaking of the 802.11b cards, The firmware of the cards does TX > and RX to establish a connection. You'd need a special version of the > firmware that didn't do this (or one of the stupid cards that forces > the driver to do all the work), or some sort of special hardware. > I've seen non-802.11 wireless devices that can do this (well, they > were one card, and you tuned the radios independently and had two > antennas), but nothing that's been commecially available. Well, one might not be able to _completely_ work unidirectional on either card. But can IP routing help shift the balance to make each card work _mostly_ unidirectional? I.e. you tune each card to a different channel and route outgoing IP packets on both sides to "the channel the other machine does not send to"? Incoming packets will be received on the interface which is tuned to the channel the other machine is sending to. I understand that this setup "works" only with two machines. Or with n cards in each node for n machines (as long as there are free channels left and some room to separate them). Or could be scaled to, say, use one channel to talk to three partners while using another channel to talk to three other partners. If this is not too much of a limit or even meets the originator's environment (when the goal is/was to speed up the throughput between two dedicated partners) it could be worth a try. Unless I missed something ... virtually yours 82D1 9B9C 01DC 4FB4 D7B4 61BE 3F49 4F77 72DE DA76 Gerhard Sittig true | mail -s "get gpg key" Gerhard.Sittig@gmx.net -- If you don't understand or are scared by any of the above ask your parents or an adult to help you. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message