PPTP error when using 3G

[Thijxx]

Hi all,

I've got a Pi with the PPTP server running, it works great, local, remote, almost from everywhere. It just doesn't work from iOS when I'm not on the local network.

I suspect the router (WRT610N) does something different to incoming PPTP over 3G, I can see the request to connect gets to my PPTP daemon and then it drops with GRE problems.

Mac -> WiFi > External IP > Raspberry = Fine
Mac -> Local WiFi > Raspberry = Fine
iOS -> 3G -> External IP = Error

Cheers,

Thijs