If you are you using Mac OS X and want to share the VPN connection to a device that doesn’t support VPNs?
With Tunnelblick you can do it.

• Create a filed called blackvpn_tunnelblick.sh or anything you like.
  
• chmod +x blackvpn_nat_on.sh
• start the file by running sudo ./blackvpn_nat_on.sh (You will be asked for you admin password)
• When you type the command you will see output like the following:
  
• Thats it, now connect your other devices set their default gateway to to the IP of the Mac OS X computer.
• Turning off the sharing, create another file named blackvpn_nat_off.sh
• 
• chmod +x blackvpn_nat_off.sh
• start the file by running sudo ./blackvpn_nat_off.sh (You will be asked for you admin password)