Getting started Planning the FortiGate configuration
FortiGate-3000 Installation Guide 01-28005-0026-20041101 23
Figure 6: Example NAT/Route multiple internet connection configuration
Transparent mode
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
You can connect up to six 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.
• Port 1, 2, and 3 can connect to other network segments.
• Port 4/HA can connect to another network segment. Port 4/HA can also connect to
other FortiGate-3000s if you are installing an HA cluster.
FortiGate-3000 Unit
in NAT/Route mode
Route mode policies
controlling traffic between
internal networks.
Internal network
DMZ network
Internal
192.168.1.1
Port 2
10.10.10.2
192.168.1.3
10.10.10.23
NAT mode policies controlling
traffic between internal and
external networks.
External
204.23.1.5
Port 1
64.83.32.45
Internet
POWER
Hi-Temp
12
3
INT
EXT
4/HA
Esc Enter
123 4/HA INTERNAL EXTERNAL
Internal network
10.10.10.3
FortiGate-3000 Unit
in Transparent mode
10.10.10.1
Management IP
Internal
10.10.10.2
Transparent mode policies
controlling traffic between
internal and external networks
204.23.1.5
(firewall, router)
Gateway to
public network
Internet
POWER
Hi-Temp
12
3
INT
EXT
4/HA
Esc Enter
123 4/HA INTERNAL EXTERNAL
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