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, ...

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, ...

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