2WAN 3LAN VPN QoS Security Router
78
identical to those of the connected VPN device. For the Incoming SPI parameters,
users must set it the same with the Outgoing SPI string of the remote VPN device.
And the Outgoing SPI string must be the same with the coming SPI string of the
remote VPN device.
7.2.3 VPN Advanced
IKE Preshared Key Only
Aggressive
Mode
：
：
：
：
This mode is mostly adopted by remote devices. The IP
connection is designed to enhance the security control if
dynamic IP is used for connection.
Compress
：
：
：
：
If this option is selected, in the connected VPN tunnel, the
device supports IP Payload Compression Protocol.
Keep-Alive
：
：
：
：
If this option is selected, VPN tunnel will keep this VPN connection.
This is mostly used to connect the remote node of the branch office
and headquarter or used for the remote dynamic IP address.
NetBIOS
Broadcast
：
：
：
：
If this option is selected, the connected VPN tunnel allows the
passage of NetBIOS broadcast packet. This facilitates the easy
connection with other Microsoft network; however, the traffic using
this VPN tunnel will increase.
NAT Traversal
：
：
：
：
It will let VPN related packs transcend
the front NAT rules without
any limits.
Dead Peer
Detection(DPD)
：
：
：
：
If this option is selected, the connected VPN tunnel will regularly
transmit HELLO/ACK message packet to detect whether there is
connection between the two ends of the VPN tunnel. If one end is
