8.1.4 PPTP (Point-to-Point Tunneling Protocol)
Select PPTP as your WAN connection type if your ISP provides information about IP Address,
Subnet Mask, Default Gateway (Optional), DNS (Optional), Server IP, Username, and Password.
Internet Connection
Type
MTU
Select PPTP to begin configuration of the PPTP connection.
Specify the Maximum Transmit Unit size. Suggest remain in Auto.