Date: Tue, 2 Jan 2001 11:18:43 -0500 From: "C. Stephen Gunn" <csg@waterspout.com> To: Wes Peters <wes@softweyr.com> Cc: freebsd-net@freebsd.org Subject: Re: Problems with VLAN and natd. Message-ID: <20010102111843.C7610@waterspout.com> In-Reply-To: <3A5175B5.1F21090B@softweyr.com>; from wes@softweyr.com on Mon, Jan 01, 2001 at 11:31:17PM -0700 References: <200101020501.AAA58976@tsunami.waterspout.com> <3A517429.91B2F251@softweyr.com> <3A5175B5.1F21090B@softweyr.com>
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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. <sigh> 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
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