Ordered 5 single board computer ref. design, all are same MAC addr, what to do?
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Posted by GS on February 14, 2006, 11:24 pm
Please log in for more thread options Ordered 5 single board computer ref. design, all are same MAC addr, what to do?, do I have to buy a unique MAC addr?. Please let me know. Globals | |||||||||||||||||||||||||
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Posted by Al Dykes on February 15, 2006, 8:18 am
Please log in for more thread options Every ethernet interface MAC address ever made is supposed to be unique. A few years ago a NIC card manufacturer screwed up and made a bunch of identical cards and it made the trade press. Contact the people you bought them from. -- a d y k e s @ p a n i x . c o m Don't blame me. I voted for Gore. | |||||||||||||||||||||||||
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Posted by Walter Roberson on February 15, 2006, 11:47 am
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>Every ethernet interface MAC address ever made is supposed to be
>unique. The requirement is only that it be unique per broadcast domain. It so happens that the easiest way to ensure that without hastle is to make them globally unique. If I recall correctly, SunOS uses the same MAC for all NICs in a given machine. | |||||||||||||||||||||||||
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Posted by Al Dykes on February 15, 2006, 12:34 pm
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>>Every ethernet interface MAC address ever made is supposed to be
>>unique. >
>The requirement is only that it be unique per broadcast domain. It >so happens that the easiest way to ensure that without hastle is to >make them globally unique. > >If I recall correctly, SunOS uses the same MAC for all NICs in a given >machine. VMS sets the MAC at runtime, too. So does any box functioning as a transparent bridge. The *hardware* is supposed to gave a globaly unique address with the Manufacturers's space assigned by the IEEE, or whoever does it these days, and a serial number assigned by the hardware manufacturer. It's possible that the company that made this prototype didn't burn an IEEE code becuase it's a *prototype* and whoever mass produces the design is supposed to get their own from the IEEE. -- a d y k e s @ p a n i x . c o m Don't blame me. I voted for Gore. | |||||||||||||||||||||||||
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Posted by glen herrmannsfeldt on February 20, 2006, 3:02 pm
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(snip) > VMS sets the MAC at runtime, too. So does any box functioning as a
> transparent bridge. The *hardware* is supposed to gave a globaly > unique address with the Manufacturers's space assigned by the IEEE, or > whoever does it these days, and a serial number assigned by the > hardware manufacturer. DECNet sets the MAC address based on the DECNet address, legal according to the standards, though only one protocol can do that (on a given host). -- glen | |||||||||||||||||||||||||
>what to do?, do I have to buy a unique MAC addr?. Please let me know.
>
>Globals
>