Chapter 10 IPsec VPN : L2TP and IPsec (Microsoft VPN) : Configuring the FortiGate unit
  
Configuring the FortiGate unit
To configure the FortiGate unit, you must:
Configure LT2P users and firewall user group.
Configure the L2TP VPN, including the IP address range it assigns to clients.
Configure an IPsec VPN with encryption and authentication settings that match the Microsoft VPN client.
Configure security policies.