Draytek Vigor2710 Series User Manual page 223

WAN1 First - While connecting, the router will use
WAN1 as the first channel for VPN connection. If
WAN1 fails, the router will use another WAN interface
instead.
WAN1 Only - While connecting, the router will use
WAN1 as the only channel for VPN connection.
3G Backup Only - While connecting, the router will
use 3G modem as the only channel for VPN
connection.
Netbios Naming Packet
Pass – click it to have an inquiry for data transmission
between the hosts located on both sides of VPN Tunnel
while connecting.
Block – When there is conflict occurred between the
hosts on both sides of VPN Tunnel in connecting, such
function can block data transmission of Netbios Naming
Packet inside the tunnel.
Multicast via VPN - 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.
Call Direction - 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.
Enable PING to keep 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.
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
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Vigor2710 Series User's Guide