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List:       firewalls-gc
Subject:    Re: Question on MAC Address
From:       mch () squirrel ! com (Mark Henderson)
Date:       1997-02-02 23:09:38
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Mike Jones writes:
> Yes, it should be like that. It's just the way Suns work. They change
> the MAC address of all Ethernet interfaces to be the same as the 
> "primary" interface (typically le0). It's OK, because MAC addresses only
> really have to be unique on a per-segment basis for things to work, and
> it keeps a 1-to-1 relationship between machines and MAC addresses.
> 
> 	Mike Jones
> 	Sr. Network Computing Advisor
> 	UNIFIED Technologies

On most modern Sun workstations and servers that MAC address is 
stored in NVRAM (SGS-Thomson M48T02, M48T08, M48T59Y depending upon 
the model of Sun). This is the same NVRAM that stores things like 
boot device, nvramrc, input-device, etc. - although the methods for 
modifying this ethernet address in NVRAM are not documented, at least 
by Sun ;-) 

The SS1000 and SC2000 are different in that, the MAC address is 
stored in a flash eeprom. 

In any case, this MAC address in NVRAM is the default MAC address for 
all ethernet and fast ethernet interfaces. You can override this
default for any particular interface with ifconfig. 

Typically this is only an issue when one wants to put two interfaces 
on the same segment. 


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