Configuring the modem interface System Network
FortiGate Version 4.0 Administration Guide
142 01-400-89802-20090424
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To configure the modem in Redundant mode, see “Redundant mode configuration” on
page 142.
To configure the modem in Standalone mode, see “Standalone mode configuration” on
page 143.
Redundant mode configuration
In redundant mode the modem interface backs up a selected ethernet interface. If that
ethernet interface disconnects from its network, the modem automatically dials the
configured dialup accounts. When the modem connects to a dialup account, the FortiGate
unit routes IP packets normally destined for the selected ethernet interface to the modem
interface.
The FortiGate unit disconnects the modem interface and switches back to the ethernet
interface when the ethernet interface is able to connect to its network. You can set a
holddown timer that delays the switch back to the ethernet interface to ensure it is stable
and fully active before switching the traffic.
The modem will disconnect after a period of network inactivity set by the value in idle
timeout. This saves money on dialup connection charges.
For the FortiGate unit to be able 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 redundant mode
1 Go to System > Network > Modem.
2 Select Redundant mode.
3 Enter the following information:
Wireless Modem Display a connected wireless modem if available.
Supported Modems Select to view a list of supported modems.
Usage History Display connections made on the modem interface. Information
displayed about connections includes:
• date and time
• duration of the connection in hours, minutes, and seconds
• IP address connected to
• traffic statistics including received, sent, and total
• current status of the connection
Dialup Account Configure up to three dialup accounts. The FortiGate unit tries
connecting to each account in order until a connection can be
established.
The active dialup account is indicated with a green check mark.
Phone Number The phone number required to connect to the dialup account. Do not add
spaces to the phone number. Make sure to include standard special
characters for pauses, country codes, and other functions as required by
your modem to connect to your dialup account.
User Name The user name (maximum 63 characters) sent to the ISP.
Password The password sent to the ISP.
Note: Do not add policies for connections between the modem interface and the ethernet
interface that the modem is backing up.
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