Fortinet FortiGate 100 - Manual (Page 60)

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Fortinet Inc.
Configure the Transparent mode default gateway Transparent mode installation
Connecting the FortiGate unit to your networks
When you have completed the initial configuration, you can connect the FortiGate unit
between your internal network and the Internet. You can also connect a network to the
DMZ interface.
There are three 10/100Base-TX connectors on the FortiGate-100:
• Internal for connecting to your internal network
• External for connecting to the Internet
• DMZ for connecting to another network
To connect the FortiGate unit running in Transparent mode:
1 Connect the Internal interface to the hub or switch connected to your internal network.
2 Connect the External interface to the Internet.
Connect to the public switch or router provided by your Internet Service Provider.
3 Connect the DMZ interface to another network.
Figure 9: FortiGate-100 Transparent mode connections
In Transparent mode, the FortiGate unit does not change the layer 3 topology. This
means that all of its interfaces are on the same IP subnet and that it appears to other
devices as a bridge. Typically, the FortiGate unit would be deployed in Transparent
mode when it is intended to provide antivirus and content scanning behind an existing
firewall solution.