I am using VMware Player and a Host-only network for various VMs for testing purposes. I'd like to be able to on-demand launch a very simple (and free) app on the host PC (which is behind a NAT router) to route between the VMware host-only LAN and my physical LAN (and therefore the Internet). This is for occasional use only - eg when I want to download an update or something to them from Windows Update.
Any ideas what I could use for this? I'd prefer proper routing software rather than just a proxy app. It needs to be something simple that isn't normally running and doesn't require reboots when turning on or off. The host machine is Windows 7 x64.