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10.3: Change Ethernet MAC address from the Terminal
Authored by: Crawdad on Nov 12, '03 11:43:47AM

Not all MAC addresses are expected to be unique across the world. If the second-lowest bit of the first octet is set, the address is "locally administered" and not assumed to be worldwide-unique.

Warning! If you set the lowest-order bit of the first octet to a "1" (in other words, if the first byte is odd) strange and bad things may happen, because that indicates an ethernet multicast address. In a very small network envirnment you might not notice, but elsewhere it may bite you.

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