RE: [lwip-users] MAC Address?

[Roger Cover]

Howdy John,

That is my understanding. We have an OUI. The price was not that much
higher than a minimum block.

Regards,
Roger
-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
John Kennedy
Sent: Friday, April 10, 2009 10:53 AM
To: 'Mailing list for lwIP users'
Subject: RE: [lwip-users] MAC Address?

Roger,
So I assume if you purchase an OUI you get a block of 2^24 = 16M
addresses OR you can purchase a minimum block of 4,096 addresses but you
don't get an OUI?

John


 
________________________________________
John Kennedy


Idaho Technology Inc.
390 Wakara Way
Salt Lake City, UT 84108, USA

USA: 1-800-735-6544
Bus:+1 (801)736-6354 x448
Fax:+1 (801)588-0507

http://www.idahotech.com/
-----Original Message-----
From: Roger Cover [mailto:address@hidden
Sent: Friday, April 10, 2009 11:12 AM
To: Mailing list for lwIP users
Subject: RE: [lwip-users] MAC Address?


Howdy Folks,

Here is a bit of information about MAC addresses that might be
applicable to this discussion:

MAC addresses can either be "universally administered" or "locally
administered."

A universally administered address is assigned to a device by its
manufacturer. The first three octets are the Organizationally Unique
Identifier (OUI) of the manufacturer (issued by the IEEE). The remaining
octets are assigned by the manufacturer.

A locally administered address can be assigned to a device by any
network administrator. Locally administered addresses must not contain
OUIs.

Universally administered and locally administered addresses are
identifiable by the bit who's value is 2 in the most significant byte of
the address. A zero in that bit indicates a universally administered
address. A one indicates a locally administered address. For example:
02-12-34-56-78-90 is a locally administered address, 00-1B-21-11-74-58
is the address of my NIC (00-1B-21 is Intel's OUI). The IEEE will not
issue an OUI with this bit set.

Locally administered addresses are the responsibility of the network
administrator where they are used. Universally administered address are
the responsibility of device manufacturers.

>>> Are there some pre-allocated MAC addresses one can use temporarily
>>> for testing?

If you want a MAC address for testing a product under development, you
can just pick any locally administered address you want (subject to your
network administrator's guidance). If you want a MAC address for
shipping a product, you need to buy a block of addresses or buy a
company OUI. Both of them are reasonably inexpensive and can be used for
any number of products.

Regards,
Roger


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