Draytek Vigor2820 Series User Manual page 146

Call Direction
Always On or Idle Timeout Always On-Check to enable router always keep VPN
Enable PING to keep alive This function is to help the router to determine the status of
PING to the IP
ISDN
PPTP
IPSec Tunnel
L2TP with ...
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as the only channel for VPN connection.
WAN2 First - While connecting, the router will use WAN2
as the first channel for VPN connection. If WAN2 fails, the
router will use another WAN interface instead.
WAN2 Only - While connecting, the router will use WAN2
as the only channel for VPN connection.
Specify the allowed call direction of this LAN-to-LAN profile.
Both:-initiator/responder
Dial-Out- initiator only
Dial-In- responder only.
connection.
Idle Timeout: The default value is 300 seconds. If the
connection has been idled over the value, the router will drop
the connection.
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.
Enter the IP address of the remote host that located at the
other-end of the VPN tunnel.
Enable PING to Keep Alive 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).
Build ISDN LAN-to-LAN connection to remote network. You
should set up Link Type and identity like User Name and
Password for the authentication of remote server. You can
further set up Callback (CBCP) function below. This feature is
useful for n model only.
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.
Build an IPSec VPN connection to the server through Internet.
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
Vigor2820 Series User's Guide