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Globally administered MAC address ranges are assigned to manufacturers. The slide said "random, "locally* administered" addresses, which aren't assigned that wa
by yuubi 12y ago
Globally administered MAC address ranges are assigned to manufacturers. The slide said "random, "locally* administered" addresses, which aren't assigned that way. There's a bit in the first octet to distinguish them; see https://en.wikipedia.org/wiki/Ethernet_address#Address_details https://en.wikipedia.org/wiki/Ethernet_address#Address_detai... .
- maguirre 12y agoexcuse my ignorance but does that mean if one is to use a locally administered address a device is free to take whatever they please? What would be advantage of paying to the IEEE for a universally administered block?
- yuubi 12y ago> does that mean if one is to use a locally administered address a device is free to take whatever they please? I think those have traditionally been set by network admins, not randomly chosen by devices, but pretty much: nobody apart from local admin coordinates addresses with the local bit set. > What would be advantage of paying to the IEEE for a universally administered block? The promise that no device built by other legit companies will have an address from that assigned block, so customers won't have to worry about MAC address conflicts, provided they use only widgets from those who honor the assignment scheme.
- eli 12y agoLegit devices have had duplicate Mac addresses even though they're not supposed to. In practice a totally random MAC is probably safer than the one assigned to a cheap network card.
- ciupicri 12y agoSpeaking of practice, I've found recently this: "Five thin client machines with same MAC Address?" ( http://superuser.com/q/760238/2357 http://superuser.com/q/760238/2357 )