[Cialug] DHCP question - Vendor info.

Morris Dovey mrdovey at iedu.com
Wed Aug 12 12:49:38 CDT 2009


Josh More wrote:
> The vendor code is the first three bytes of the MAC address.

AIUI, that's true only if the first two bits (I/G and U/L) are both 
zero. When I/G is set to one, then the address is a multicast address. 
If the U/L bit is set to 1, then the address is locally administered.

If those two bits are zeros, then the remainder of the first three bytes 
are the OUI, which identifies the manufacturer.

-- 
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/

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