Draytek Vigor2120n-plus User Manual page 295

Dial-Out Settings

Both:-initiator/responder

Dial-Out- initiator only

Dial-In- responder only.
Always On-Check to enable router always keep VPN
connection.
Idle Timeout: The default value is 300 seconds. If the
connection has been idled over the value, the router will
drop the connection.
Enable PING to keep IPsec Tunnel alive - This function
is to help the router to determine the status of IPsec VPN
connection, especially useful in the case of abnormal VPN
IPsec tunnel disruption. For details, please refer to the note
below. Check to enable the transmission of PING packets to
a specified IP address.
It is used to handle abnormal IPsec VPN connection
disruption. It will help to provide the state of a VPN
connection for router's judgment of redial. Normally, if any
one of VPN peers wants to disconnect the connection, it
should follow a serial of packet exchange procedure to
inform each other. However, if the remote peer disconnect
without notice, Vigor router will by no where to know this
situation. To resolve this dilemma, by continuously sending
PING packets to the remote host, the Vigor router can know
the true existence of this VPN connection and react
accordingly. This is independent of DPD (dead peer
detection).
PING to the IP - Enter the IP address of the remote host
that located at the other-end of the VPN tunnel.
Type of Server I am calling –
PPTP - Build a PPTP VPN connection to the server
through the Internet. You should set the identity like User
Name and Password below for the authentication of remote
server.
IPsec Tunnel - Build an IPsec VPN connection to the
server through Internet.
L2TP with IPsec Policy - Build 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-out
VPN connection becomes one pure L2TP connection.

Must: Specify the IPsec policy to be definitely
applied on the L2TP connection.
User Name - This field is applicable when you select,
PPTP or L2TP with or without IPsec policy above. The
length of the name is limited to 49 characters.
Password - This field is applicable when you select PPTP
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Vigor2120 Series User's Guide