From owner-freebsd-arch@FreeBSD.ORG Fri Sep 30 10:03:00 2005 Return-Path: X-Original-To: freebsd-arch@freebsd.org Delivered-To: freebsd-arch@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B98F216A420 for ; Fri, 30 Sep 2005 10:03:00 +0000 (GMT) (envelope-from ceri@submonkey.net) Received: from shrike.submonkey.net (cpc2-cdif2-3-1-cust208.cdif.cable.ntl.com [82.31.78.208]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2BE1143D49 for ; Fri, 30 Sep 2005 10:02:59 +0000 (GMT) (envelope-from ceri@submonkey.net) Received: from ceri by shrike.submonkey.net with local (Exim 4.52 (FreeBSD)) id 1ELHjF-0004mI-C2; Fri, 30 Sep 2005 11:02:57 +0100 Date: Fri, 30 Sep 2005 11:02:57 +0100 From: Ceri Davies To: Peter Jeremy Message-ID: <20050930100257.GA4190@submonkey.net> Mail-Followup-To: Ceri Davies , Peter Jeremy , freebsd-arch@freebsd.org References: <200509241525.16173.max@love2party.net> <20050924192237.GP40237@cirb503493.alcatel.com.au> <20050928102153.GA86457@comp.chem.msu.su> <20050928032933.G16027@xorpc.icir.org> <20050928184731.GA72352@cirb503493.alcatel.com.au> <20050928231409.GB38338@squash.dsto.defence.gov.au> <20050930095649.GK72352@cirb503493.alcatel.com.au> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="UugvWAfsgieZRqgk" Content-Disposition: inline In-Reply-To: <20050930095649.GK72352@cirb503493.alcatel.com.au> X-PGP: finger ceri@FreeBSD.org User-Agent: Mutt/1.5.11 Sender: Ceri Davies Cc: freebsd-arch@freebsd.org Subject: Re: Bridges X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Sep 2005 10:03:00 -0000 --UugvWAfsgieZRqgk Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Sep 30, 2005 at 07:56:49PM +1000, Peter Jeremy wrote: > On Thu, 2005-Sep-29 08:44:09 +0930, Wilkinson, Alex wrote: > >What is the difference between a "per-host MAC address" and a "per-NIC > >MAC address" ? >=20 > All NICs have a unique MAC address. This address can be over-ridden by > the host if it needs to have the same MAC address appear on multiple > interfaces. >=20 > Of the two cases I mentioned: DECnet changes all MAC addresses to one > beginning AA0055 where the low bits are the host's DECnet address. > This removes the need for IP's ARP since the source host can determine > the destination host's MAC address without needing to ask the network. >=20 > Some versions of Solaris with some NICs (definitely Solaris 8 with > Cassini NICs) associate a MAC address with the host, rather than the > NIC. I'm less certain of the rationale for this. That's a setting in the SPARC eeprom: local-mac-address? set to true uses the MAC addresses on the NICs. The rationale is not clear to me either. Ceri --=20 Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Einstein (attrib.) --UugvWAfsgieZRqgk Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDPQ1RocfcwTS3JF8RAsRgAJoDiv/pQ8QWiMRpfyHLZW9KbsN9xwCgsUrc v0AGwguvPMFenjL6dMopp8c= =I684 -----END PGP SIGNATURE----- --UugvWAfsgieZRqgk--