Draytek VIGOR2925 SERIES User Manual page 415

Dial-Out Settings
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 disconnects 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.
SSL Tunnel - Build an SSL VPN connection to the server
through Internet.
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
or L2TP with or without IPSec policy above. The length of
the password is limited to 15 characters.
PPP Authentication - This field is applicable when you
select, PPTP or L2TP with or without IPSec policy above.
PAP/CHAP/MS-CHAP/MS-CHAPv2 is the most common
selection due to compatibility.
VJ compression - This field is applicable when you select
PPTP or L2TP with or without IPSec policy above. VJ
Compression is used for TCP/IP protocol header
compression. Normally set to On to improve bandwidth
utilization.
IKE Authentication Method - This group of fields is
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Vigor2925 Series User's Guide