PXE

There’s an odd thing with PXE imaging using MAC addresses. You have to specify them with 7 bytes.

MAC addresses are manufacturer assigned 6 byte numbers. The first 3 are assigned to identify the manufacturer, the last 3 used for uniqueness. A manufacturer can be assigned more than one 3 byte sequence of course.

So where does the seventh byte come from? The format of PXE MAC addresses are 01-xx-xx-xx-xx-xx-xx where the 01 stands for the version of ARP being used. It has never incremented to version 2.

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