Add the BBA page from Google code.

How-to-use-the-BroadBand-Adapter-(BBA).md

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+## Setup a TAP device
+---
+
+This section will explain how to install and configure the software necessary for BBA use.
+
+
+### Windows
+---
+
+Install OpenVPN TAP Adapter V9, included in the OpenVPN installer:
+
+[OpenVPN download page](http://openvpn.net/index.php/download/community-downloads.html)
+
+- In `Control Panel\Network and Sharing Center\Change adapter settings`, select the TAP device and the adapter you use to connect to the internet.
+- Right-click and select "Bridge Connections".
+
+
+### Linux
+---
+
+Install OpenVPN from your distribution package manager, then run the following commands (as root) to create the virtual interface and bridge it to your physical Ethernet adapter: 
+
+```
+openvpn --mktun --dev Dolphin --dev-type tap
+brctl addbr br0
+brctl addif br0 Dolphin
+brctl addif br0 eth0    # or whatever your network interface is
+ip l set Dolphin up
+ip l set Dolphin promisc on
+```
+
+You'll also need to change your network settings to configure IP/gateway on br0 instead of your usual adapter.
+Linux doesn't support adding a wireless interface to a bridge as of July 2012 so you need a wired NIC for that to work.
+
+
+## Configure Dolphin
+---
+
+Config -> Gamecube -> SP1, select BBA.
+
+Now you may play any games which use the BBA.