Networks You configure network settings so that a virtual machine can communicate with the host and with other virtual machines. Virtual Network InterfacesYou can add a virtual network interface to a virtual machine using a subclass of VirtualEthernetCard, you can set the addressType to Manual, Generated, or Assigned. If you choose Assigned, you can specify a MAC address explicitly. Virtual Machine MAC AddressUpon virtual machine creation, ESXi or vCenter Server systems assign each virtual network interface its own unique MAC address. The first three bytes of the MAC address that is generated for each virtual network adapter consists of a manufacturer-specific Organizationally Unique Identifier (OUI). The MAC address-generation algorithm produces the other three bytes. vSphere generates MAC addresses that are checked for conflicts. After the MAC address has been generated, it does not change unless the virtual machine is moved to a different location.Parent topic: Configuring a Virtual Machine