Network Router User Manual

Configuring the FortiGate unit Planning the FortiGate configuration
FortiGate-50A/50B, FortiWiFi-50B and FortiGate-100 FortiOS 3.0 MR4 Install Guide
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Configuring the FortiGate unit
This section provides an overview of the operating modes of the FortiGate unit.
Before beginning to configure the FortiGate unit, you need to plan how to
integrate the unit into your network. Your configuration plan depends on the
operating mode you select: NAT/Route mode or Transparent mode.
This section includes the following topics:
• Planning the FortiGate configuration
• Preventing the public interface from responding to ping requests
• NAT/Route mode installation
• Transparent mode installation
• Next steps
Planning the FortiGate configuration
Before you configure the FortiGate unit, you need to plan how to integrate the unit
into the network. Among other things, you must decide whether you want the unit
to be visible to the network, which firewall functions you want it to provide, and
how you want it to control the traffic flowing between its interfaces.
Your configuration plan depends on the operating mode you select. You can also
configure the FortiGate unit and the network it protects using the default settings.
NAT/Route mode
In NAT/Route mode, the FortiGate unit is visible to the network. Like a router, all
its interfaces are on different subnets. The following interfaces are available in
NAT/Route mode:
Modem is the interface for connecting an external modem to the FortiGate-50A.
See “Configuring the modem for the FortiGate-50A” on page 53.
You can add firewall policies to control whether communications through the
FortiGate unit operating in NAT or Route mode. Firewall policies control the flow
of traffic based on the source address, destination address, and service of each
packet. In NAT mode, the FortiGate unit performs network address translation
before it sends the packet to the destination network. In Route mode, there is no
address translation.
Table 11: NAT/Route mode network segments
FortiGate Unit Internal Interface External
Interface
Other
FortiGate-50A Internal External Modem
FortiGate-50B Internal WAN1 WAN2
FortiWiFi-50B Internal WAN1 WAN2
FortiGate-100A Internal External DMZ