- Remove virtual machine from inventory

- Download the vmx file from datastore to local drive

- Delete vmx file from datastore

- Edit the vmx file with configuration settings :

remove lines begins with (N is the number of the network adapter)

ethernetN.generatedAddress
ethernetN.addressType
ethernetN.generatedAddressOffset

add

ethernetN.address = "00:50:56:XX:YY:ZZ"
ethernetN.addressType="static"

- Upload the new vmx file to datastore
- Register the vmx file with ESX server