Draytek VigorPro 5510 Series User Manual page 164

Enable this account
ISDN
PPTP
IPSec Tunnel
L2TP
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.
Allow the remote ISDN dial-in connection. You can further
set up Callback function below. You should set the User
Name and Password of remote dial-in user below. This
feature is for i model only.
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 make 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.
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VigorPro5510 Series User's Guide