Configuring The Modem Interface; Selecting A Modem Mode; Redundant Mode Configuration - Fortinet FortiGate FortiGate-50A Installation Manual

Configuring the modem interface

Selecting a modem mode

Redundant mode configuration

FortiGate-50A Installation Guide
FortiGate-50A Installation Guide Version 2.80 MR8
The FortiGate-50A includes the option of an external modem for use as either a
redundant interface or a standalone interface in NAT/Route mode.
• In redundant mode, the modem interface automatically takes over from a selected
ethernet interface when that ethernet interface is unavailable.
• In standalone mode, the modem interface is the connection from the FortiGate unit
to the Internet.
When connecting to an ISP in either configuration, the modem can automatically dial
up to three dialup accounts until the modem connects to an ISP.
This chapter describes:
• Selecting a modem mode
• Configuring modem settings
• Connecting and disconnecting the modem in Standalone mode
• Defining a Ping Server
• Adding firewall policies for modem connections
An external modem with the FortiGate-50A can work in one of two modes, depending
on your requirements:
• redundant mode
• standalone mode.
The redundant modem interface in redundant mode backs up a selected ethernet
interface. If that ethernet interface disconnects from its network, the modem
automatically dials the configured dialup account(s). 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. 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 FortiGate unit
disconnects the modem interface and switches back to the ethernet interface.
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