Draytek Vigor2912 User Manual page 309

Available settings are explained as follows:
Item
User account and
Authentication
Allowed Dial-In Type
Description
Enable this account - Check the box to enable this
function.
Idle Timeout- If the dial-in user is idle over the limitation
of the timer, the router will drop this connection. By
default, the Idle Timeout is set to 300 seconds.
User Name - This field is applicable when you select PPTP
or L2TP with or without IPsec policy above. The length of
the name/password is limited to 23 characters.
Password - This field is applicable when you select PPTP
or L2TP with or without IPsec policy above. The length of
the name/password is limited to 19 characters.
Enable Mobile One-Time Passwords (mOTP) - Check
this box to make the authentication with mOTP function.
PIN Code – Type the code for authentication (e.g, 1234).
Secret – Use the 32 digit-secret number generated by
mOTP in the mobile phone (e.g., e759bb6f0e94c7ab4fe6).
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 make 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
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Vigor2912 Series User's Guide