From owner-freebsd-net Tue Jan 2 8:16:36 2001 From owner-freebsd-net@FreeBSD.ORG Tue Jan 2 08:16:34 2001 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from tsunami.waterspout.com (tsunami.waterspout.com [208.13.56.11]) by hub.freebsd.org (Postfix) with ESMTP id 96B0F37B400 for ; Tue, 2 Jan 2001 08:16:32 -0800 (PST) Received: from dustdevil.waterspout.com (tsunami.waterspout.com [208.13.56.11]) by tsunami.waterspout.com (8.9.3/8.9.3) with ESMTP id LAA62078 for ; Tue, 2 Jan 2001 11:16:31 -0500 (EST) (envelope-from csg@dustdevil.waterspout.com) Received: (from csg@localhost) by dustdevil.waterspout.com (8.11.1/8.11.1) id f02GKBR13710; Tue, 2 Jan 2001 11:20:11 -0500 (EST) (envelope-from csg) Date: Tue, 2 Jan 2001 11:18:43 -0500 From: "C. Stephen Gunn" To: Wes Peters Cc: freebsd-net@freebsd.org Subject: Re: Problems with VLAN and natd. Message-ID: <20010102111843.C7610@waterspout.com> References: <200101020501.AAA58976@tsunami.waterspout.com> <3A517429.91B2F251@softweyr.com> <3A5175B5.1F21090B@softweyr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <3A5175B5.1F21090B@softweyr.com>; from wes@softweyr.com on Mon, Jan 01, 2001 at 11:31:17PM -0700 Sender: csg@dustdevil.waterspout.com Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Mon, Jan 01, 2001 at 11:31:17PM -0700, Wes Peters wrote: > Sorry to reply to my own message, but another thought hit me. Now that > the swelling has gone down, I thought I should share it: > > This might even give us a start at a sticky problem that has been bugging > VLAN switch makers from the start, namely, per-VLAN ARP tables. That is > something really needed to do VLANs correctly. Yeah.. having the same hardware MAC address on each of the virtual interfaces can cause some bigtime problems. We have a major problem with a Cisco at Purdue where the hash it made of (mac_address + ipaddress) was a colission between two of our subnets. The layer-3 switch card in the Cisco decided that it was obviously a load-share routed, route. FreeBSD isn't too happy with 1/2 of its traffic arriving on the _wrong_ virtual interface.. heh. Anyways.. I digress.. I'm not entirely sure what per-interface (or vlan) arp entried on FreeBSD would buy us. The existing VLAN code only makes the *BSD box a multihomed host, not a VLAN forwarder/router. The latter would require a mechnism to bridge/forward/filter packets between independant 802.1q encapsulated interfaces. - Steve -- C. Stephen Gunn URL: http://www.waterspout.com/ WaterSpout Communications, Inc. Email: csg@waterspout.com 427 North 6th Street Phone: +1 765.742.6628 Lafayette, IN 47901 Fax: +1 765.742.0646 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message