FortiGate-800 and FortiGate-800F FortiOS 3.0MR4 Install Guide
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Planning the FortiGate configuration
Configuring the FortiGate unit
You typically use NAT/Route mode when the FortiGate unit is operating as a
gateway between private and public networks. In this configuration, you would
create NAT mode firewall policies to control traffic flowing between the internal,
private network and the external, public network (usually the Internet).
Figure 6: Example NAT/Route mode network configuration.
NAT/Route mode with multiple external network connections
In NAT/Route mode, you can configure the FortiGate unit with multiple redundant
connections to the external network (usually the Internet).
For example, you could create the following configuration:
• External is the default interface to the external network (usually the Internet)
• Internal is the interface to the internal network
• DMZ is the interface for the DMZ network
• Port 1 is the redundant interface to the external network (usually the Internet)
You must configure routing to support redundant Internet connections. Routing
can automatically redirect connections from an interface if its connection to the
external network fails.
Otherwise, security policy configurations is similar to a NAT/Route mode
configuration with a single Internet connection. You would create NAT mode
firewall policies to control traffic following between the internal, private network
and the external, public network (usually the Internet).
Note:
If you have multiple internal networks, such as a DMZ network in addition to the
internal, private network, you could create route mode firewall policies for traffic flowing
between them.
Internet
DMZ
network
DMZ
10.10.10.1
10.10.10.2
Internal
network
Internal
192.168.1.99
192.168.1.3
Route policies controlling
traffic between
Internal networks.
NAT policies controlling
traffic between internal
and external networks.
External
204.23.1.5
Note:
If you have multiple networks, such as a DMZ network in addition to the internal
private network, you could create route mode firewall policies for traffic flowing between
them.
