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I'd suggest starting with what the answer to the old question says. An OUI of 00:00:00 is assigned to Xerox; that either means 1) there's Xerox hardware that uses it or 2) it's assigned to Xerox, the original inventors of Ethernet, to keep it permanently reserved. If you don't have any Xerox equipment on your network, those packets are probably coming from a device that's putting bad packets on the network.