Draytek Vigor2110 Series User Manual page 204

Multicast via VPN
Call Direction
Always On or Idle
Timeout
Enable PING to keep
alive
Type of Server I am
calling
both sides of VPN Tunnel in connecting, such function can
block data transmission of Netbios Naming Packet inside the
tunnel.
Some programs might send multicast packets via VPN
connection.
Pass – Click this button to let multicast packets pass through
the router.
Block – This is default setting. Click this button to let multicast
packets be blocked by the router.
Specify the allowed call direction of this LAN-to-LAN profile.
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.
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.
PING to the IP - 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).
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.
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Vigor2110 Series User's Guide