http://blogs.msdn.com/virtual_pc_guy/archive/2004/11/12/256294.aspxOne of the cool 'hidden' features of Virtual PC / Virtual Server is the ability to dedicate a physical network to be used only by virtual machines. This can be done simply by going to the 'Control Panel' on the host computer and then going to the 'Networken-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/virtual_pc_guy/archive/2004/11/12/256294.aspx#256428Fri, 12 Nov 2004 14:26:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:256428Peter da SilvaThis capability should be something that you can tune on a protocol-by-protocol and service-by-service level, everywhere in the OS. If you could do that you could eliminate the need for firewalls for most purposes, there's no need to firewall off a service that's only listening to localhost. :)