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SonicOS Enhanced 4.0 Administrator Guide
Understanding WWAN Failover
When the WAN Connection Model is set to Ethernet with WWAN Failover, the WAN
(Ethernet) interface is the primary connection. If the WAN interface fails, the SonicWALL TZ
190 fails over to the WWAN interface.
Note It is important to note that the WAN-to-WWAN failover process is different for the three
different WWAN Connection Profile dial types: Persistent, Dial on Data, and Manual Dial.
The following sections describe the three different methods of WAN-to-WWAN failover:
• “Persistent Connection WWAN Failover” on page 373
• “Dial on Data WWAN Failover” on page 374
• “Manual Dial WWAN Failover” on page 375
Persistent Connection WWAN Failover
The following diagram depicts the sequence of events that occur when the WAN ethernet
connection fails and the WWAN Connection Profile is configured for Persistent Connection.
1. Primary Ethernet connection available – The Ethernet WAN interface is connected and
used as the primary connection. WWAN is never connected while the Ethernet WAN
interface is available (unless an explicit route has been configured which specifies WWAN
as the destination interface).
2. Primary Ethernet connection fails – The WWAN connection is initiated and remains in an
“always-on” state while the Ethernet WAN connection is down.