LinuxSA Mailing list archives

  From: Richard Sharpe <sharpe@ns.aus.com>
  To  : LinuxSA@linuxsa.org.au
  Date: Wed, 07 Apr 1999 16:31:18 +0900

Re: Duplicate MAC addresses

At 02:03 PM 4/7/99 +0930, David Newall <davidn@rebel.net.au> wrote:
>On Wed, 7 Apr 1999, Matthew Tippett wrote:
>>> 2. Duplicate MAC addresses on different segments separated by a router:
>>> 
>>>     11:22:33:44:55:66                      11:22:33:44:55:66
>>>            -----------------[Router]------------------ 
>>
>> As it turns out, dual homed Sun systems do exactly this.  Present the
>> MAC address to be *precisely* the same on either network.  This is 
>> irrespective of whether the machine is packet forwarding or not.
>
>The original concept for Ethernet was that each *machine* would
>have a fixed Ethernet address, and so all machines with multiple
>Ethernet interfaces would have the same address for each interface.
>For example (following from Matthew's comment), the router would
>have the same MAC address on both the left and the right ethernet.
>This would work even if the router was in fact a bridge.

Hmmm, reference please. This is interesting folklore. I have a copy of the
November 1982 Ethernet V2 spec from Digital, Intel and Xerox, but it does
not mention anything like that. 
h

Regards
-------
Richard Sharpe, sharpe@ns.aus.com, NIC-Handle:RJS96
NS Computer Software and Services P/L, 
Ph: +61-8-8281-0063, FAX: +61-8-8250-2080, 
Samba (Team member), Linux, Apache, Digital UNIX, AIX, C, ...

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