Draytek Vigor 2820 User Manual page 126

Allowed Dial-In Type
ISDN
PPTP
IPSec Tunnel
L2TP
120
Determine the dial-in connection with different types.
Allow the remote ISDN LAN-to-LAN connection. You
should set the User Name and Password of remote dial-in user
below. This feature is useful for i model only. In addition, you
can further set up Callback function below.
Allow the remote dial-in user to make a PPTP VPN
connection through the Internet. You should set the User
Name and Password of remote dial-in user below.
Allow the remote dial-in user to trigger an IPSec VPN
connection through Internet.
Allow the remote dial-in user to make a L2TP VPN
connection through the Internet. You can select to use L2TP
alone or with IPSec. Select from below:
None - Do not apply the IPSec policy. Accordingly, the VPN
connection employed the L2TP without IPSec policy can be
viewed as one pure L2TP connection.
Nice to Have - Apply the IPSec policy first, if it is applicable
during negotiation. Otherwise, the dial-in VPN connection
becomes one pure L2TP connection.
Must - Specify the IPSec policy to be definitely applied on
the L2TP connection.
Vigor2820 Series User's Guide