Draytek Vigor2912 Series User Manual page 284

Vigor2912 Series User's Guide
WAN1 First/ WAN2 First/ WAN3 First - While
connecting, the router will use WAN1/WAN2/WAN3
as the first channel for VPN connection. If
WAN1/WAN2/WAN3 fails, the router will use
another WAN interface instead.
WAN1 Only /WAN2 Only/WAN 3 Only- While
connecting, the router will use WAN1/WAN2/WAN3
as the only channel for VPN connection.
WAN1 Only: Backup WAN2 - If WAN2 failed, the
router will use WAN1 for VPN connection.
WAN2 Only: Backup WAN1- If WAN1 failed, the
router will use WAN2 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
disconnect without notice, Vigor router will by no where to
know this situation. To resolve this dilemma, by
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