Valid mac address|
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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
Please log in for more thread options No. But that doesn't mean that misconfigured or malfunctioning equipment will never generate it. | |||||||||||||||||||||||||||||||||||||
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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 | |||||||||||||||||||||||||||||||||||||
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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 | |||||||||||||||||||||||||||||||||||||
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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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>learning and forwarding ?