Fortinet FortiGate Series Administration Guide

Configuring the modem interface System Network
FortiGate Version 4.0 MR1 Administration Guide
202 01-410-89802-20090903
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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:
4 Select Apply.
5 Configure a ping server for the ethernet interface the modem backs up.
6 Configure firewall policies for network connectivity through the modem interface.
See “Adding firewall policies for modem connections” on page 203.
Standalone mode configuration
In standalone mode, the modem connects to a dialup account to provide a connection to
the Internet. You can configure the modem to dial when the FortiGate unit restarts or when
there are unrouted packets. You can also hang up or redial the modem manually.
If the connection to the dialup account fails, the FortiGate unit will redial the modem. The
modem redials the number of times specified by the redial limit, or until it connects to a
dialup account.
The modem will disconnect after a period of network inactivity set by the value in idle
timeout. This saves money on dialup connection charges.
You must configure firewall policies for connections between the modem interface and
other FortiGate interfaces.
You must also go to Router > Static to configure static routes to route traffic to the modem
interface. For example, if the modem interface is acting as the FortiGate unit external
interface you must set the device setting of the FortiGate unit default route to modem.
To configure standalone mode
1 Go to System > Network > Modem.
Note: Do not add policies for connections between the modem interface and the ethernet
interface that the modem is backing up.
Redundant for From the list, select the interface to back up.
Holddown timer Enter the number of seconds to continue using the modem after the
network connectivity is restored.
Redial Limit Enter the maximum number of times to retry if the ISP does not answer.
Dialup Account 1
Dialup Account 2
Dialup Account 3
Enter the ISP phone number, user name and password for up to three
dialup accounts.

Fortinet FortiGate Series Specifications

General

Model	FortiGate Series
Category	Firewall
Throughput	Varies by model
Interfaces	Varies by model
Concurrent Sessions	Varies by model
VPN Support	Yes
High Availability	Yes
Firewall Throughput	Varies by model
VPN Throughput	Varies by model
IPS Throughput	Varies by model
NGFW Throughput	Varies by model
Threat Protection Throughput	Varies by model
New Sessions per Second	Varies by model
Power Supply	Varies by model
Security Features	Firewall, IPS, Application Control, Web Filtering, Antivirus, VPN
Virtual Domains	Yes
Form Factor	Desktop, Rackmount