I have a VPN set up box to box using Netgear VPN routers. If I turn off the windows fire wall on the windows 7 machine, I can access shared printers and files. But, when I turn on the firewall, it blocks access, and even stops responding to pings. The computers that are on the same side of the VPN as the Windows 7 machine access shares just fine. What exeptions do I need to make in the firewall to allow traffic from across the VPN Tunel?