Draytek Vigor2820 Series User Manual page 167

Netbios Naming Packet Pass – click it to have an inquiry for data transmission between the
Multicast via VPN
Call Direction
Always On or Idle
Timeout
Enable PING to keep
alive
PING to the IP
ISDN
PPTP
first channel for VPN connection. If WAN2 fails, the router will
use another WAN interface instead.
WAN2 Only - While connecting, the router will use WAN2 as the
only channel for VPN connection.
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.
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.
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).
Build ISDN LAN-to-LAN connection to remote network. You
should set up Link Type and identity like User Name and Password
for the authentication of remote server. You can further set up
Callback (CBCP) function below. This feature is useful for s model
only.
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.
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Vigor2820 Series User's Guide