Draytek Vigor2830 Series User Manual page 233

Enable this profile - Check here to activate this profile.
VPN Dial-Out Through - Use the drop down menu to
choose a proper WAN interface for this profile. This setting
is useful for dial-out only.
WAN1 /WAN2 /WAN3 First - While connecting, the
router will use WAN1 /WAN2 /WAN3 as the first
channel for VPN connection. If WAN1 fails, the
router will use another WAN interface instead.
WAN1 /WAN2 /WAN3 Only - While connecting, the
router will use WAN1 /WAN2 /WAN3 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
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Vigor2830 Series User's Guide