According to the OpenVPN HOWTO, to expand the scope of the VPN to include additional machines on the server side when using a routed VPN (dev tun): [quote]Make sure that you've enabled IP and TUN/TAP forwarding on the OpenVPN server machine.[/quote] I understand that, in a windows server environment, enabling IP forwarding requires setting the value of IPEnableRouter to 1 in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters But what is TUN/TAP forwarding and how do I enable it in windows?

[Resolved] TUN/TAP forwarding on the OpenVPN server machine?

gipadm

According to the OpenVPN HOWTO, to expand the scope of the VPN to include additional machines on the server side when using a routed VPN (dev tun):

Make sure that you've enabled IP and TUN/TAP forwarding on the OpenVPN server machine.

I understand that, in a windows server environment, enabling IP forwarding requires setting the value of IPEnableRouter to 1 in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

But what is TUN/TAP forwarding and how do I enable it in windows?