The VMware OUI MAC addresses
Every virtual machine and vmkernel interface that you create on an ESXi host will need a layer-2 identity to interface with the network. Much like in the physical world, MAC addresses provide this unique identity to all the virtual machines or interfaces that connect to a virtual switch. Every physical network interface will have a burned-in 48-bit MAC address whose numbering is organizationally unique. This is because every vendor that makes the card will have a set of Organizationally Unique Identifiers (OUI) assigned to them by the IEEE (Institute of Electrical and Electronics Engineers). In fact, the vendor purchases OUIs from IEEE's Registration Authority. VMware also has a set of OUIs assigned to it, and those ...
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