From owner-freebsd-net@FreeBSD.ORG  Tue Apr  4 05:59:23 2006
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
X-Original-To: net@freebsd.org
Delivered-To: freebsd-net@FreeBSD.ORG
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 11E1F16A401
	for <net@freebsd.org>; Tue,  4 Apr 2006 05:59:23 +0000 (UTC)
	(envelope-from mi+kde@aldan.algebra.com)
Received: from aldan.algebra.com (aldan.algebra.com [216.254.65.224])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 968A343D46
	for <net@freebsd.org>; Tue,  4 Apr 2006 05:59:22 +0000 (GMT)
	(envelope-from mi+kde@aldan.algebra.com)
Received: from aldan.algebra.com (aldan [127.0.0.1])
	by aldan.algebra.com (8.13.6/8.13.6) with ESMTP id k345xKPd031880
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Tue, 4 Apr 2006 01:59:21 -0400 (EDT)
	(envelope-from mi+kde@aldan.algebra.com)
Received: from localhost (localhost [[UNIX: localhost]])
	by aldan.algebra.com (8.13.6/8.13.6/Submit) id k345xKYe031879;
	Tue, 4 Apr 2006 01:59:20 -0400 (EDT)
	(envelope-from mi+kde@aldan.algebra.com)
From: Mikhail Teterin <mi+kde@aldan.algebra.com>
To: Luigi Rizzo <rizzo@icir.org>
Date: Tue, 4 Apr 2006 00:59:19 -0500
User-Agent: KMail/1.8.2
References: <200603301657.43218.mi+mx@aldan.algebra.com>
	<200604011834.12572@aldan> <20060401201948.A33543@xorpc.icir.org>
In-Reply-To: <20060401201948.A33543@xorpc.icir.org>
X-Face: %UW#n0|w>ydeGt/b@1-.UFP=K^~-:0f#O:D7w<gv/&E-lL7twZCT8B~/PA4|\t$ti+22K">hJ5G_<5143Bb3kOIs9XpX+"V+~$adGP:J|SLieM31VIhqXeLBli"<kcG^EOVihy+z3/UR{6SCQ
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200604040159.20210@aldan>
Cc: ugen@netvision.net.il, archie@dellroad.org, net@freebsd.org
Subject: Re: Is there an API for ipfw?
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 04 Apr 2006 05:59:23 -0000

On Saturday 01 April 2006 11:19 pm, Luigi Rizzo wrote:
= It would help if you could run, when the traffic stalls, a tcpdump on
= both source and destination, and tell me where you see the traffic.

Ok here is an even simpler case (mspiggy is a Windows 2003 Server):

	% ipfw pipe 1 config bw 6500KBytes/s
	% ipfw add 200 pipe 1 ip from mspiggy to mi

Not even pings come back to the ping program, even though tcpdump (on mi)
shows them returning to the kernel:

	01:52:23.665065 IP mi > mspiggy: ICMP echo request, id 42518, seq 14, length 64
	01:52:23.665359 IP mspiggy > mi: ICMP echo reply, id 42518, seq 14, length 64
	[...]

This seems to first hit, when I try a fractional number of MBytes:

	% ipfw pipe 1 config bw 6.5MBytes/s

Trying to correct it afterwards does not seem to have an effect. The pipe must
be recreated:

	% ipfw pipe 1 delete
	% ipfw pipe 1 config bw 6500KBytes/s

And then everything starts working again. Yours,

	-mi