FortiWiFi-60A/AM FortiOS 3.0 MR4 Install Guide
50 01-30004-0283-20070215
Selecting a modem mode Configuring the mode m interface
Selecting a modem mode
The modem interface can work in one of two modes:
• redundant mode
• stand alone mode

Redundant mode configuration

The redundant modem interface serves as a backup to the Ethernet interface. If
that Ethernet interface disconnects from its network, the modem automatically
dials the configured dial-up account(s). When the modem connects to a dial-up
account, the FortiWiFi unit routes IP packets normally destined for the selected
Ethernet interface to the modem interface. During this time, the unit pings the
Ethernet connection to check when it is back online.
When the Ethernet interface can connect to its network again, the FortiWiFi unit
disconnects the modem interface and switches back to the Ethernet interface.
For the FortiWiFi 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 FortiWiFi interfaces.
To configure a redundant modem connection for the FortiWiFi-60AM
1Go to System > Network > Modem.
2Select Enable modem.
3Select Redundant for the mode.
4From the Redundant for list, select the Ethernet interface you want the modem to
back up.
5Configure other modem settings as required.
“Configuring modem settings” on page 52.
6Configure a ping server for the Ethernet interface selected in step 4.
See “Adding a Ping Server” on page 56.
7Configure firewall policies for connections to the modem interface.
See “Adding firewall policies for modem connections” on page 56.
To configure the FortiWiFi-60A using the CLI
1Log into the CLI.
2Enter the following to configure a redundant modem:
config system modem
set status enable
set status mode redundant
end

Stand alone mode configuration

In stand alone mode, you manually connect the modem to a dial-up account. The
modem interface operates as the primary connection to the Internet. The FortiWiFi
unit routes traffic through the modem interface, which remains permanently
connected to the dial-up account.