The last two bytes are assigned in the mechanism so that each MAC address is assigned would be unique. I have confirmed the Same from the few of Virtual Machine MAC Address. The automatically generated MAC address has the fourth octet is equal to 128 + the vCenter instance ID converted to hexadecimal.Ĥth Octet of MAC = ( 128+ vCenter Instance ID) Convert it to HexadecimalĤth Octet of VM MAC = 98 (Conversion of 152 to Hexadecimal)
How to Calculate 4th Octet of the VM MAC Address? To get the vCenter Server Instance ID -> Login to vSphere Client ->Administration -> vCenter Server Settings -> Runtime Settings. How does 4th octet of VM MAC address are calculated? Let’s begin the Calculation.Ĥth Octet of MAC = ( 128+ vCenter Instance ID) Convert it to Hexadecimal This is the VMware Organizational Unique Identifier (OUI). How vCenter Assigns Virtual MAC Address to VMware Virtual Machine?Īs we aware that, First 3 Octects will be 00:50:56.
ESXi host which is not managed by the vCenter server will have the different mechanism to generate the MAC address for Virtual Machine. This post only applies to the VM MAC generation, in which ESXi host is managed by vCenter Server. This may be the biggest question in our mind? Let’s discuss How MAC addresses are assigned to VMware Virtual Machines by the vCenter server. We all aware that first 3 octets will be 00:50:56. I have been asked by many VMware Administrators about how MAC addresses are assigned to Virtual Machine?. Diff VCenter 5.5 appliance and vCenter on WIndows.