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56 01-28008-0018-20050128 Fortinet Inc.
Selecting a modem mode Configuring the modem interface
For the FortiGate unit to switch from an ethernet interface to the modem you must
select the name of the interface in the modem configuration and configure a ping
server for that interface. You must also configure firewall policies for connections
between the modem interface and other FortiGate interfaces.
To configure backup modeTo configure a redundant modem connection
1 Go to System > Network > Modem.
2 Select Redundant for the mode.
3 From the Redundant for list, select the ethernet interface that you want the modem to
back up.
4 Configure other modem settings as required.
“Configuring modem settings” on page 57.
5 Configure a ping server for the ethernet interface selected in step 3.
See “Defining a Ping Server” on page 59.
6 Configure firewall policies for connections to the modem interface.
See “Adding firewall policies for modem connections” on page 60.
Standalone mode configuration
In standalone mode, you manually connect the modem to a dialup account. The
modem interface operates as the primary connection to the Internet. The FortiGate
unit routes traffic through the modem interface, which remains permanently connected
to the dialup account.
If the connection to the dialup account fails, the FortiGate unit automatically redials
the modem. The modem redials the ISP number based on the amount of times
specified by the redial limit, or until it connects to a dialup account.
In standalone mode the modem interface replaces the WAN1 or WAN2 ethernet
interface. When configuring the modem, you must set Redundant for to the name of
the ethernet interface that the modem interface replaces. You must also configure
firewall policies for connections between the modem interface and other FortiGate
interfaces.
To operate in standalone mode
1 Go to System > Network > Modem.
2 From the Redundant for list, select the ethernet interface that the modem is replacing.
Note: Do not add policies for connections between the modem interface and the interface that
the modem is backing up.
Note: Do not add a default route to the ethernet interface that the modem interface replaces.
Note: Do not add firewall policies for connections between the ethernet interface that the
modem replaces and other interfaces.