How is Hamachi what you're looking for? I could be mistaken but I gave Hamachi a whirl cause it was quick to get up and running and basically it just lets you browse the machine you install hamachi on in the remote network. I'm not sure about this user but for me VPN needs to let me logon to the domain remotely. For example, my client has his company laptop at home and he logs onto the company domain via vpn so as far as he's concerned he's connected to the lan. Can you do this with OpenVPN?