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  From: David Newall <davidn@rebel.net.au>
  To  : Matthew Tippett <mtippett@ticons.com.au>
  Date: Wed, 7 Apr 1999 14:03:57 +0930 (CST)

Re: Duplicate MAC addresses

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.

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