Amit IOG851-0T031, User Manual, Page: 27 / 389

Industry Cellular Gateway
Operation Mode:
There are three option items “Always on”, “Failover”, and “Disable” for the operation mode setting.
Always on: Set this WAN interface to be active all the time. When two or more WAN are established at
"Always on" mode, outgoing data will through these WAN connections base on load balance policies.
Failover:
A failover interface is a backup connection to the
primary. That means only when its primary WAN
connection is broken, the backup connection will be
started up to substitute the primary connection.
As shown in the diagram, WAN-2 is backup WAN for
WAN-1. WAN-1 serves as the primary connection with
operation mode "Always on". WAN-2 won’t be
activated until WAN-1 disconnected. When WAN-1
connection is recovered back with a connection, it will
take over data traffic again. At that time, WAN-2
connection will be terminated.
Seamless Failover:
In addition, there is a "Seamless" option for Failover
operation mode. When seamless option is activated
by checking on the "Seamless" box in configuration
window, both the primary connection and the
failover connection are started up after system
rebooting. But only the primary connection executes
the data transfer, while the failover one just keeps
alive of connection line. As soon as the primary
connection is broken, the system will switch,
meaning failover, the routing path to the failover
connection to save the dial up time of failover
connection since it has been alive.
When the “Seamless” enable checkbox is activated, it
can allow the Failover interface to be connected
continuously from system booting up. Failover WAN
interface just keeps connecting without data traffic.
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