Date: Fri, 30 Sep 2005 19:56:49 +1000 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: freebsd-arch@freebsd.org Subject: Re: Bridges Message-ID: <20050930095649.GK72352@cirb503493.alcatel.com.au> In-Reply-To: <20050928231409.GB38338@squash.dsto.defence.gov.au> 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>
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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" ? 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. 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. 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. -- Peter Jeremy
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