Failover - Vololink VoloAccess User Manual

VoloAccess™

Failover

Failover is the capability to switch automatically to a secondary network when the primary network fails.
By default Failover is disabled. Once enabled, the VoloAccess supports failover between multiple WAN
interfaces. Automatic failover provides enhanced availability and reliability.
WAN failover takes place when a WAN device fails due to disconnection, for example, the 3G network
goes offline. If the primary WAN interface fails, the VoloAccess redirects network traffic through the
secondary WAN interface until the primary WAN interface becomes available and its connectivity is
verified.
By default, the WAN Ethernet is established as the primary interface together with the embedded 3G
wireless module as the secondary interface.
The preference (primary or secondary) of the WAN interfaces is configurable. Factors that may contribute
to the selection of the primary interface are items like cost, reliability and speed.
The following diagram shows the VoloAccess utilizing both a 3G wireless broadband connection and a
wired connection (ADSL modem) to implement automatic failover.
The connectivity of the WAN interfaces is verified by regular monitoring of reliable hosts. When a DNS
lookup of a reliable host via an interface fails, the VoloAccess marks that interface as failed and
automatically activates an alternate interface.
Setting up Failover
Following is an example of setting up a wired modem as the secondary WAN interface.
Do not connect a WAN Ethernet cable until Failover has been enabled and configured.
To access the WAN Failover page select WAN then Failover in the navigation panel – the Failover page
appears.
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Select Enabled from the drop-down list box and click the Apply button.
Copyright © Vololink Pty Ltd 2006-2010 V1.43 July 2010
User Manual
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