How to change MAC of a virtual machine to MAC which belongs to reserved VmWare MACs

Sometimes it is necessary to change MAC address of a virtual machine and in most cases there is no any issue except MAC-addresses which belong to reserved VmWare MACs. In this situation ESXi shows such error:

 To fix the problem you can use the algorithm described below (all information about it you can find in this article). 

Some old versions of ESXi distributions have a bug which doesn’t allow to change MAC address (expression ethernetx.checkMACAddress is not working). For ESXi 5.1 you have to apply this patch: ESXi510-201307401-BG. You can download it from this page.

BR,
Vadim

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