From owner-freebsd-net@FreeBSD.ORG  Thu Jul 27 15:50:20 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 24EAE16A510
	for <net@freebsd.org>; Thu, 27 Jul 2006 15:50:19 +0000 (UTC)
	(envelope-from dionch@freemail.gr)
Received: from smtp.freemail.gr (smtp.freemail.gr [81.171.104.107])
	by mx1.FreeBSD.org (Postfix) with ESMTP id B26E543D79
	for <net@freebsd.org>; Thu, 27 Jul 2006 15:50:18 +0000 (GMT)
	(envelope-from dionch@freemail.gr)
Received: by smtp.freemail.gr (Postfix, from userid 101)
	id 57226B79682; Thu, 27 Jul 2006 18:50:17 +0300 (EEST)
Received: from CDION (unknown [62.38.9.197])by smtp.freemail.gr (Postfix) with
	ESMTP id A15F3A084A5; Thu, 27 Jul 2006 18:50:16 +0300 (EEST)
Date: Thu, 27 Jul 2006 18:49:59 +0300
From: Chris Dionissopoulos <dionch@freemail.gr>
X-Mailer: The Bat! (v3.80.06) Professional
X-Priority: 3 (Normal)
Message-ID: <8210225344.20060727184959@freemail.gr>
To: Luigi Rizzo <rizzo@icir.org>
In-Reply-To: <20060726091619.A99336@xorpc.icir.org>
References: <20060726071232.A96367@xorpc.icir.org>
	<563361368.20060726190713@freemail.gr>
	<20060726091619.A99336@xorpc.icir.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: net@freebsd.org
Subject: Re[2]: multiple DSL modems and pppoe sessions on the same ethernet ?
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: Chris Dionissopoulos <dionch@freemail.gr>
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: Thu, 27 Jul 2006 15:50:20 -0000

Hello Luigi,

Wednesday, July 26, 2006, 7:16:19 PM, you wrote:


>> >  
>> >     ------+--------------+--------------+--------------+-----
>> >           |              |              |              |
>> >           +-[modem1]     +-[modem2]     +-[modem3]     +-[FreeBSD/ppp]
>> >               DSL#1          DSL#2          DSL#3 
> ...
>> if your switch supports vlan and 802.1q encapsulation, you would create

> it doesn't so not applicable.

>> another approach is to use 3 ng_ether interfaces with custom mac
>> addresses defined and linked to the same ng_bridge node with physical:

> hmmm, i think this won't work either, because each PADI
> frame will reach all modems so i cannot differentiate
> among the replies.

As long as pppoe PADI(*) using broadcast mac (ff:ff:ff:ff:ff:ff)
as destination there is no solution to distinguish them using a
single broadcast domain(=LAN) (only one broadcast addr for each broadcast domain).


How about to patch this netgraph node?
http://venus.wsb-nlu.edu.pl/~dlupinsk/ng_mangle/

Adding a "dstmac" argument which changes destination mac for each
transmitted packet, makes you free to use 3 mangled ng_ether(4)
virtual nics in your ppp.conf. If it doesn't breaks anything
(pppoe standart) it will work. right?


And off course, using 3 physicals cross linked to each modem is the (obvious)
solution.


(*) http://en.wikipedia.org/wiki/Pppoe#PADI

-- 
Best regards,
 Chris                            mailto:dionch@freemail.gr


____________________________________________________________________
http://www.freemail.gr - δωρεάν υπηρεσία ηλεκτρονικού ταχυδρομείου.
http://www.freemail.gr - free email service for the Greek-speaking.