Makes sense that it's not true as then you could have some VM's internally using this network setup and have no access outside the vApp (such as app and DB VM's) and then a multi-honed web VM to this network and an external network.
That's absolutely not true
I finally had time to do some testing in my environment. I setup the internal network and disabled NAT/Firewall and setup DHCP on the network. When I deployed the VM the guest customization script locked up my RHEL 5.5 VM. When I reset the VM it did pull DHCP properly.
Do you still have your VM set to do guest customization?
Eric