From owner-freebsd-questions@FreeBSD.ORG  Thu Mar 18 08:36:30 2004
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 88BF316A4CF; Thu, 18 Mar 2004 08:36:30 -0800 (PST)
Received: from u1030.c03.escapebox.net (gen045.n002.c03.escapebox.net
	[213.73.82.45])	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 32F3043D3F; Thu, 18 Mar 2004 08:36:30 -0800 (PST)
	(envelope-from francis@u1030.c03.escapebox.net)
Received: from francis by u1030.c03.escapebox.net with local (Exim 3.36 #1)
	id 1B40VL-000F8F-00; Thu, 18 Mar 2004 17:36:23 +0100
Date: Thu, 18 Mar 2004 17:36:23 +0100
From: Francis GUDIN <francis@u1030.c03.escapebox.net>
To: Luigi Rizzo <rizzo@icir.org>
Message-ID: <20040318163623.GA56866@u1030.c03.escapebox.net>
References: <20040318105728.GA2470@u1030.c03.escapebox.net>
	<20040318080849.A40631@xorpc.icir.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20040318080849.A40631@xorpc.icir.org>
User-Agent: Mutt/1.4.2.1i
cc: freebsd-ipfw@freebsd.org
cc: freebsd-questions@freebsd.org
Subject: Re: dummynet and adsl
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 18 Mar 2004 16:36:30 -0000

On Thursday, 18 March 2004 at  8:08:49 -0800, Luigi Rizzo wrote :
> On Thu, Mar 18, 2004 at 11:57:28AM +0100, Francis GUDIN wrote:
> > Hello everybody,
> > 
> > I'm in the process of setting up a bandwidth control with ipfw and
> > dummynet. My connection is done through pppoe on adsl.
> > 
> > In ipfw(8), i found the following:
> >  "If a device name is specified instead of a numeric value, as in
> > 
> >        ipfw pipe 1 config bw tun0
> > 
> >   then the transmit clock is supplied by the specified device.  At
> >   the moment only the tun(4) device supports this functionality,
> >   for use in conjunction with ppp(8)."
> > 
> > Having two different bandwidth available (up- and downstream), would
> > this option work ? Or, is only symetric bw case taken into account
> 
> 'bw tun0' means that the pipe will transmit a new packet when
> the device's (tun0 in this case) transmit queue becomes empty.
> 
> In any case the question is irrelevant here because tun0's queue
> is drained by the userland process reading from /dev/tun0
> and writing onto the output link. With a serial line and no
> buffering you could hope that this matches the outbound
> bandwidth, but with pppoe on adsl you basically see the
> ethernet speed on transmission.
> 
> 	cheers
> 	luigi
> 

Thank you ! Things are much clearer to me, now. Back to work !

BR,
Francis.