Transparent Mode; Configuration Options - Fortinet FortiGate FortiGate-300 Installation Manual

Planning the FortiGate configuration

Transparent mode

Configuration options

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Otherwise, security policy configuration is similar to a NAT/Route mode configuration
with a single Internet connection. 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 multiple internet connection configuration
External
204.23.1.5
Internet
DMZ
64.83.32.45
In Transparent mode, the FortiGate unit is invisible to the network. Similar to a
network bridge, all FortiGate interfaces must be on the same subnet. You only have to
configure a management IP address so that you can make configuration changes.
The management IP address is also used for antivirus and attack definition updates.
You typically use the FortiGate unit in Transparent mode on a private network behind
an existing firewall or behind a router. The FortiGate unit performs firewall functions,
IPSec VPN, virus scanning, IPS, web content filtering, and Spam filtering.
Figure 7: Example Transparent mode network configuration
Gateway to
public network
192.168.1.1
204.23.1.5
Internet
(firewall, router)
You can connect up to three network segments to the FortiGate unit to control traffic
between these network segments.
• External can connect to the external firewall or router.
• Internal can connect to the internal network.
• DMZ/HA can connect to another network segment. Interface DMZ/HA can also
connect to other FortiGate-300s if you are installing an HA cluster.
Once you have selected Transparent or NAT/Route mode operation, you can
complete the configuration plan and begin to configure the FortiGate unit.
01-28004-0021-20040830
FortiGate-300 Unit
in NAT/Route mode
Esc Enter
192.168.1.1
NAT mode policies controlling
traffic between internal and
external networks.
FortiGate-300 Unit
in Transparent mode
Esc Enter
External
192.168.1.2
Management IP
Transparent mode policies
controlling traffic between
internal and external networks
Internal network
Internal
Internal network
Internal
Getting started
192.168.1.3
192.168.1.3
Fortinet Inc.