Creating Inturnal Domain/Network

HI

I have 4 Vms im about to build (as a test environment)
2 Win 2k8 standard
1 Vista
1 win 7

the hope is to have them all connected in a Virtual Domain with one of the Servers running DHCP. but also need the 4 computers to connect to the internet (to download updates and such)

the network im hoping to use is 10.0.0.X 255.255.255.0 and the gateway as 10.0.0.1
Im Using Shared networking (figuring that they could all talk together and all Connect to the internet)


in Networking (on the host)
i have set the Parrallels Shared networking adapter
ip: 10.0.0.1
Sub: 255.255.255.0
Router: is blank

the first Win2k8 server (used for DHCP)
is set to
ip: 10.0.0.10
subnet: 255.255.255.0
Default gateway: 10.0.0.1

when i ping the Default Gateway from the VM i get pings (the ip address in the Parallels Shared network ad)
from the host i can ping the internet
but from the VMs i cannot

before i tried to change these settings i could ping the web from the VMs
but need to change the settings to reflect the work im doing

Obviously this is a Route issue (but i have no ideas were the routes are set so that the VM and the Host can talk and so that the VM's can talk to the Internet)


Host: Mac 10.6.3 host Mac Pro
Build 5.0.9344
6gb ram (on host) 1gb for all 4 vm's
no boot camp
Parallels tools are installed on all 4 computer, however i have stopped access to the host drives