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The following screenshots and configuration are from Windows XP. If you use Windows 2000, Windows Vista or Windows 7 then these will likely not be identical but will be similar enough to be useful.
Windows does not have a 'TAP' driver built in like Linux, so you must install one provided by the OpenVPN project.
Download the OpenVPN client Windows Installer, and run the installer (the guide was tested with v2.1.1 and v2.1.3). We only need to install the 'TAP' device, so only select that from the installer.
Installing the driver may pop up a dialog box about installing an unsigned device driver. RPCEmu requires this driver to do networking.
Find the newly created device in Control Panel -> Network Connections and rename the device (it will likely have been created with the name 'Local Area Connection (Highest number)', I recommend renaming to 'rpcemu' (all lower case).
Right click the 'rpcemu' TAP interface and select 'Properties' click on the 'Configure' button and then select the 'Advanced' tab.
Set the MAC Address variable to '060203040506'.
Set the Media Status to 'Always Connected'.
In the Control Panel -> Network Connections window, select both the 'rpcemu' interface and the interface you wish to bridge it with e.g. 'Local Area Connection' (using ctrl-click to select multiple). Then right-click and select 'Bridge Connections'. When you bridge the connections you will probably see all of your computers network connections to other machines close down, and networking will return after a short delay.
On Windows XP (and possibly others) the full configuration of the Bridge Interface is not remembered across reboots of the Host operating System. Delete and recreate the bridge interface on each reboot if need be.
You need to configure Windows 7 and Windows Vista to behave in a manner more similar to Windows XP with regard to packet forwarding over the Network Bridge interface.
You will need to run the following commands as 'Administrator' on the command line (if necessary create a shortcut to 'cmd.exe' and then right click that shortcut and select 'Run as Administrator').
First discover the interface number of the Network bridge interface:
netsh interface ipv4 show interface
You should have output similar to this, the number is the Idx of the 'Network Bridge' Interface, in this case it's 17.
Idx Met MTU State Name --- ---------- ---------- ------------ --------------------------- 1 50 4294967295 connected Loopback Pseudo-Interface 1 17 20 1500 connected Network Bridge
Then enter the following 4 commands, altering the number to the Idx of the 'Network Bridge' interface discovered above.
netsh interface ipv4 set interface 17 weakhostsend=enabled netsh interface ipv4 set interface 17 weakhostreceive=enabled netsh interface ipv6 set interface 17 weakhostsend=enabled netsh interface ipv6 set interface 17 weakhostreceive=enabled
Run RPCEmu and open the networking configuration GUI (on the main menu, Settings -> Networking).
Select the 'Ethernet Bridging' option, Set the bridgename to be the same CASE SENSITIVE name of the TAP driver configured earlier ('rpcemu'), and click on OK. RPCEmu will reset and RISC OS will restart.
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