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RE: DAD question

"Manfredi, Albert E" <albert.e.manfredi@boeing.com> Wed, 15 August 2012 19:01 UTC

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From: "Manfredi, Albert E" <albert.e.manfredi@boeing.com>
To: "sthaug@nethelp.no" <sthaug@nethelp.no>
Date: Wed, 15 Aug 2012 14:00:26 -0500
Subject: RE: DAD question
Thread-Topic: DAD question
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References: <CALKmEuAqzAsabqs7dMBHHkBvwbAx_UVLgJGJH83-y9wHZKt6FQ@mail.gmail.com> <20120815.125627.74680163.sthaug@nethelp.no> <502B88DC.3060300@gont.com.ar> <20120815.133810.41706030.sthaug@nethelp.no>
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sthaug@nethelp.no wrote:

> 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.

But that's not the whole story, right?

The only way this can work is if one assumes that each interface of that box is connected to a different IP subnet. I don't even think Ethernet rules are what matters here. If the box should happen to be dual homed to the same IP subnet, that Sun scheme doesn't work. (I suppose unless only one of the box's interface is active at any given time.

Bert

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