[dba-VB] Setting up a test VM

Using a VM running on my server, I want to emulate as closely as possible a workstation running out 
on the internet connecting in to my server over Hamachi.  I have the VM running but it was part of 
my workgroup.  I changed the workgroup name for the VM but I am still able to access it remote 
desktop by the machine name which means that very likely the router is using stored info and 
assigning the VM an IP.  I really wanted to isolate it as much as I can from my internal network.

I tried assigning the machine an entirely different IP range (192.168.122.x instead of 192.168.1.x) 
but when I did that it appears that hamachi instantly loses it's tunnel through the firewall.

Any suggestions for how to go about making this thing isolated?

-- 
John W. Colby
www.ColbyConsulting.com