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SonicOS 5.8.1 Administrator Guide
Persistent Connection 3G Failover
The following diagram depicts the sequence of events that occur when the WAN ethernet
connection fails and the 3G Connection Profile is configured for Persistent Connection.
1. Primary Ethernet connection available – The Ethernet WAN interface is connected and
used as the primary connection. 3G is never connected while the Ethernet WAN interface
is available (unless an explicit route has been configured which specifies 3G as the
destination interface).
2. Primary Ethernet connection fails – The 3G connection is initiated and remains in an
“always-on” state while the Ethernet WAN connection is down.
If a secondary Ethernet WAN (the OPT port) is configured, the
appliance will first failover
to the secondary Ethernet WAN before failing over to the 3G. In this situation, 3G failover
will only occur when both the WAN and OPT paths are unavailable.
3. Reestablishing Primary Ethernet Connectivity After Failover – When the Ethernet WAN
connection (either the WAN port or the OPT port, if so configured) becomes available again,
all LAN-to-WAN traffic is automatically routed back to the available Ethernet WAN
connection. This includes active connections and VPN connections. The 3G connection is
closed.
Caution It is not recommended to configure a policy-based route that uses the 3G connection when
the WAN Connection Model is set for Ethernet with 3G Failover. If a policy-based route
is configured to use the 3G connection, the connection will remain up until the Maximum
Connection Time (if configured) is reached.
Internet
Internet
WWAN
Ethernet
WAN
link/spd
activity
NSA 240
Primary Ethernet
connection re-established
(successive pings succeed)