Valid mac address

Valid mac address
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Subject Author Date
Valid mac address Srinivas 02-07-2006
Posted by Srinivas on February 7, 2006, 8:21 pm
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Is 00 00 00 00 00 00 a valid mac address which could be subjected to
learning and forwarding ?

Thanks in advance
Srinivas


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Posted by Walter Roberson on February 7, 2006, 11:20 pm
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>Is 00 00 00 00 00 00 a valid mac address which could be subjected to
>learning and forwarding ?

No.

But that doesn't mean that misconfigured or malfunctioning
equipment will never generate it.


Posted by Rich Seifert on February 8, 2006, 11:36 am
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> Is 00 00 00 00 00 00 a valid mac address which could be subjected to
> learning and forwarding ?
>

There is nothing syntactically *invalid* about that address, either as a
SA or a DA. However, since the OUI 00-00-00 has not been assigned to any
equipment manufacturer, no device should be using it. That said, it is
possible that a device may emit frames to/from that address under fault
conditions (e.g., the device is broken in some fashion), so a *receiver*
(e.g., a bridge or end station) should be prepared to deal with frames
sent to/from the address, and not produce undesirable results.


--
Rich Seifert Networks and Communications Consulting
21885 Bear Creek Way
(408) 395-5700 Los Gatos, CA 95033
(408) 228-0803 FAX

Send replies to: usenet at richseifert dot com

Posted by Albert Manfredi on February 8, 2006, 11:44 am
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Rich Seifert wrote:
>
> > Is 00 00 00 00 00 00 a valid mac address which could be subjected to
> > learning and forwarding ?
> >
>
> There is nothing syntactically *invalid* about that address, either as a
> SA or a DA. However, since the OUI 00-00-00 has not been assigned to any
> equipment manufacturer, no device should be using it. That said, it is
> possible that a device may emit frames to/from that address under fault
> conditions (e.g., the device is broken in some fashion), so a *receiver*
> (e.g., a bridge or end station) should be prepared to deal with frames
> sent to/from the address, and not produce undesirable results.

Didn't some antique machines, I dimly remember Suns perhaps, use the
all 0s MAC address as a broadcast address?

Bert


Posted by Albert Manfredi on February 8, 2006, 11:45 am
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Rich Seifert wrote:
>
> > Is 00 00 00 00 00 00 a valid mac address which could be subjected to
> > learning and forwarding ?
> >
>
> There is nothing syntactically *invalid* about that address, either as a
> SA or a DA. However, since the OUI 00-00-00 has not been assigned to any
> equipment manufacturer, no device should be using it. That said, it is
> possible that a device may emit frames to/from that address under fault
> conditions (e.g., the device is broken in some fashion), so a *receiver*
> (e.g., a bridge or end station) should be prepared to deal with frames
> sent to/from the address, and not produce undesirable results.

Didn't some antique machines, I dimly remember Suns perhaps, use the
all 0s MAC address as a broadcast address?

Bert


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