If you’ve wondered how you can get your windows to connect to a VPN server without having to pay Microsoft Terminal Services Licenses then you’re in luck. There is a linux solution called Poptop. I’ve tried Openssh and Openvpn either solution requires installing a windows client and not reusing the existing vpn connectivity interface offered by Windows. I have confirmed this working on Windows 7 connecting to Ubuntu. My Ubuntu is a small virtual machine running off another server costing little overhead. Please note however that the encryption used is not secure enough. Microsoft client supports pptp using 128bit strength which is the point of failure. Not fault of microsoft per se. they support stronger encryption that, at this time, does not exist in a free open source solution that we can use.
net.ipv4.ip_forward = 1
echo 1 > /proc/sys/net/ipv4/ip_forward
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