Duplicated MACs [was Re: Include DaynaPort by default in GENERIC?]

[Mouse <mouse%Rodents-Montreal.ORG@localhost>]

> deimos# ifconfig -a
> [le0, qe0, qe1, qe2, qe3, hme0, be0 all showing 08:00:20:00:de:ad]

> Why are all the interfaces stuck to the same MAC address?

It is a comparatively little-known aspect of the relevant specs that
MAC addresses do not have to be unique to any finer than per-machine
granularity (but are allowed to be unique per-interface).  Suns
normally keep their MAC in the PROM, with all Ethernets ultimately all
picking the host's MAC up from the same place, leading to them all
using the same MAC.

> Could that be due to the local-mac-address value in the PROM ?

Depends on the OS.  1.4T, which is what I'm running on all my SPARCs,
ignores local-mac-address? as far as I can see.  I did add a kernel
build option HOSTID_EA which generates locally-administered MACs based
on the hostid for the second and later (in attach order) interfaces

#ifdef HOSTID_EA
  { static int count = 0;
    if (count++ != 0)
     { cp[0] = 2;
       cp[1] = count >> 8;
       cp[2] = count & 0xff;
       cp[3] = (hostid >> 16) & 0xff;
       cp[4] = (hostid >> 8) & 0xff;
       cp[5] = hostid & 0xff;
       return;
     }
  }
#endif

but I forget why I wanted it.

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