WhereCanIGetAValidMACAddress < DULG

%SECTION0{name=WhereCanIGetAValidMacAddress}% Where Can I Get a Valid MAC Address from?

   Question:: Where can I get a valid MAC address from?
                                                                                
   Answer:: You have to buy a block of 4096 MAC addresses (IAB =
     Individual Address Block) or a block of 16M MAC addresses (OUI =
     Organizationally Unique Identifier, also referred to as 'company
     id') from IEEE Registration Authority. The current cost of an
     IAB is $550.00, the cost of an OUI is $1,650.00. See
     [[http://standards.ieee.org/regauth/oui/index.shtml]]
     %BR% %BR%
     You can buy Eproms containing MAC addresses from:
     [[http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3748][Maxim]] or
     [[http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2018&mcparam=en538890][Microchip]].
     %BR% %BR%
     You can set the "locally administered" bit to make your own MAC
     address (no guarantee of uniqueness, but pretty good odds if you
     don't do something dumb). Ref:
     [[http://en.wikipedia.org/wiki/MAC_address][Wikipedia]]
     <blockquote>
     Universally administered and locally administered addresses are
     distinguished by setting the second least significant bit of the
     most significant byte of the address. If the bit is 0, the
     address is universally administered. If it is 1, the address is
     locally administered. The bit is 0 in all OUIs. For example,
     02-00-00-00-00-01. The most significant byte is 02h. The binary
     is 00000010 and the second least significant bit is 1.
     Therefore, it is a locally administered address.
     </blockquote>
     In U-Boot, you can use the ="gen_eth_addr"= tool to generate a
     random "locally administered" MAC address. Here are the needed
     commands:
     <verbatim>
$ make tools/gen_eth_addr
cc     tools/gen_eth_addr.c   -o tools/gen_eth_addr
$ tools/gen_eth_addr
ba:d0:4a:9c:4e:ce
     </verbatim>
14.2.13. Ethernet Does Not Work		1. Abstract		14.2.15. Why do I get TFTP timeouts?
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