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I'm trying to get my iDevice to use its USB connection for all network access, instead of WiFi. I had thought it would be as simple as using a VPN, and routing that VPN through some ports I'm forwarding from the iDevice, but that's not quite working.

Have I misconfigured something, or is it simply not possible to tunnel PPTP over SSH?

I've forwarded ports 1723 and 47 (using ssh -R) from the device to the PPTP server and configured the client to connect to localhost. However, it fails to connect.

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SSH tunnels TCP. AFAIK it is not possible to ssh tunnel GRE.

The 47 is the IP protocol number for GRE. It is not a port number. GRE is a protocol at the same layer as TCP or UDP. GRE is directly above IP.

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