About dual WAN configuration
The Digi EX15 is a Dual-WAN device, meaning that by default, it has two interfaces capable of providing
Internet access: its WAN Ethernet port and the plug-in cellular modem. The additional LAN port may
also be reconfigured for supplemental Internet access.
Note By default, the Digi EX15 device is in cellular passthrough mode. The device must be in router
mode to use the dual WAN functionality. See Enable router mode for instructions.
Failover
Active WAN connections can provide both failover and load balancing per user-defined parameters.
By default, this allows the plug-in modem to serve as a secondary (backup) WAN that becomes the
active connection when the Ethernet WAN port is detected as offline. The Digi EX15 then monitors the
offline connection to see when it comes back online, which prompts the backup interface to once
again become inactive.
Each interface has a Metric value associated with its IPv4 configuration. By default, the WAN
interfacewill take priority over all other interfaces, because its default Metric value is 1).
Connectivity monitoring
Note Both tests are set via the default group configuration in aView. It is not built into the firmware.
Devices that have not synced with aView will not have these tests enabled by default.
To properly trigger a failover (or failback) scenario, test parameters must be defined to monitor the
primary connection. Both a Ping and HTTP test come built into the Digi EX15 WAN port configuration
by default. After 4 failed attempts, the secondary connection will take over Internet access for the Digi
EX15. Similarly, the monitoring tests trigger the restoration of the primary WAN connection when they
detect that the interface with a higher metric has come back up.
Note Best practices dictate that redundant tests (with divergent failure conditions) will be the best
way to ensure proper connectivity monitoring and active recovery. With only a single test type, false
positives could be reported. Two different tests are recommended to prevent false positives.
Digi EX15 User Guide
33
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