VPN host using VPS with only one network interface

I'm trying to route all network traffic from an iPad through a VPS. I tried to setup a PPTP-VPN host using net/mpd5 based on the explanations in Poptop / iphone problem thread. However, I got stuck and I think the reason may be that I'm unable to create an internal network with my VPS with only one network interface. Does anyone know if it can be done?
 
You don't need any more interfaces, it should work with just one.
 
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