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Page 60 SonicWALL Internet Security Appliance Administrator’s Guide
4 Configuring the TELE3 SP Modem Connection
To improve the operational availability of networks and ensure fast recovery from network failures,
the SonicWALL has the capability of using a modem to dial a secondary network connection for the
WAN. In the event that the WAN Ethernet connection is lost or failing, the modem dials an ISP using
a preconfigured profile preventing a lengthy interruption in active network connectivity.
Alert Using the WAN failover feature may cause disruption of some features such as One-to-One
NAT. See the SonicWALL TELE3 SP Administrator’s Manual for affected features.
After configuring your computer on the LAN, you can configure the TELE3 SP modem connection for
ISP failover or as a primary dial-up access port.
Alert You cannot use the WAN failover feature if you have configured the TELE3 SP to use Standard
mode in the Network section of the Management interface.
Configuring the TELE3 SP WAN Failover Feature
The TELE3 SP modem can be used as a failover option when your “always on” DSL or cable
connection fails. The SonicWALL automatically detects the failure of the WAN connection and uses
the parameters configured for the modem to establish another active connection.
Alert The TELE3 SP modem can only dial out. Dialing into the internal modem is not supported.
However, an external modem can be connected to the CLI port for remotely accessing the
SonicWALL for out-of-band support.
To access the modem configuration section of your SonicWALL, log onto the Management interface,
and click Modem. There are two tabs used for modem configuration: Profiles and Configure.