Draytek Vigor2830 Series User Manual page 241

Allowed Dial-In Type
Specify Remote VPN
Gateway
Determine the dial-in connection with different types.
PPTP - 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.
IPSec Tunnel- Allow the remote dial-in user to trigger an IPSec
VPN connection through Internet.
L2TP with IPSec Policy - 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.
You can specify the IP address of the remote dial-in user or peer
ID (should be the same with the ID setting in dial-in type) by
checking the box. Also, you should further specify the
corresponding security methods on the right side.
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Vigor2830 Series User's Guide