I'm a real Ubuntu newbie but at the school where I work I managed to install Ubuntu then install pptpd.
I was feeling very pleased with myself when last evening from home with my Apple iPhone through my wi-fi, I was able to connect and access all resources on the network. Same thing with my Mac.
However, when I turned off the wi-fi on my phone and tried to access through 3G it didn't work. When I had a "Proper" VPN server installed at school it worked fine so I can't see that it's my network provider turning off VPN...
Anyone any ideas?
BTW - the commands that seemed to make the difference on connecting to all resources seems to be the following:
sudo iptables -t nat -A POSTROUTING -0 eth0 -j MASQUERADE sudo sysctl net.ipv4.ip_forward=1