You can probably do this with OpenVPN, but the specifics are going to be a bit more detailed than that. Any particular reason you want to do this? HE.net is free, highly available, and works very, ...
I've got IPv6 enabled on my network, so I can get to either IPv4 or IPv6 websites. If I start an OpenVPN connection (Windows Vista client), I've got the IPv4 address from the remote OpenVPN server, ...