Some time ago I built a secondary VMware cluster for doing some specific testing.
From the primary VMware cluster I copy a virtual machine over SCP to the new secondary VMware cluster.

I then boot up the virtual machine on the new secondary VMware cluster and I experienced some network connectivity issues.

The problem was that the MAC address of the virtual machine was the same MAC address the virtual machine on the main site had and they were running on the same VLAN.

When VMware prompts you about if you Copied or Moved a Virtual Machine make sure you enter that you copied, so that it generates the following unique attributes:

uuid.location
uuid.bios
ethernet0.generatedAddress

In this case there was no prompts so I had to make the following changes on the Virtual Machine configuration files so that the next time it boots new identifiers are generated.

1) Power off Virtual Machine

2) Go to the Service Console and open the configuration file for the virtual machine in question:

[root@esx4 ~]# vi /vmfs/volumes/[datastore]/[vmname]/[vmname].vmx

Delete the following lines:
uuid.location
uuid.bios
ethernet0.generatedAddress

3) Power on Virtual Machine and new values will be generated.