3G/4G Failover: Connect on Data Configuration depicts the sequence of events that occur when the WAN Ethernet connection fails and the 3G/4G Connection Profile is configured for Connect on Data.
3G/4G Failover: Connect on Data Configuration
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1
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Primary Ethernet connection available – The Ethernet WAN interface is connected and used as the primary connection. 3G/4G is never connected while the Ethernet WAN interface is available (unless an explicit route has been configured which specifies the U0/U1/M0 interface as the destination interface).
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2
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Primary Ethernet Connection Fails – The U0/U1/M0 interface connection is not established until qualifying outbound data attempts to pass through the SonicWall appliance.
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3
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3G/4G Connection Established – The U0/U1/M0 interface connection is established when the device or a network node attempts to transfer qualifying data to the Internet. The U0/U1/M0 interface stays connected until the Maximum Connection Time (if configured) is reached.
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4
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Reestablishing WAN Ethernet Connectivity After Failover – When an Ethernet WAN connection becomes available again or the inactivity timer (if configured) is reached, all LAN-to-WAN traffic is automatically routed back to the available Ethernet WAN connection. The U0/U1/M0 interface connection is terminated.
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