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Re: DAD question

sthaug@nethelp.no Wed, 15 August 2012 11:38 UTC

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Date: Wed, 15 Aug 2012 13:38:10 +0200
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To: fernando@gont.com.ar
Subject: Re: DAD question
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> > Note that this is a perfectly valid configuration according to the
> > Ethernet standards.
> 
> Just curious: were the MAC addresses "globally unique"? (me talking
> about the U/L bit in the MAC address).

Globally unique. The point here is that the Ethernet standards require
a globally unique MAC address *per box*, not necessarily per interface.
The "Sun way" of storing a MAC address in EEPROM and configuring all
network cards with the same MAC address was perfectly compliant, just
somewhat unusual.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no

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