Re: Bridges

From: Ceri Davies (ceri_at_submonkey.net)
Date: 09/30/05

  • Next message: Dag-Erling Smørgrav: "Re: Bridges" 
    Date: Fri, 30 Sep 2005 11:02:57 +0100
To: Peter Jeremy <PeterJeremy@optushome.com.au>

    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" ?
    >
    > 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.

    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 

    -- 
Only two things are infinite, the universe and human stupidity, and I'm
not sure about the former.			  -- Einstein (attrib.)

  • Next message: Dag-Erling Smørgrav: "Re: Bridges"

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