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Planning the configuration
NAT/Route mode
Transparent mode
28
In NAT/Route mode, the FortiCarrier-5001A security system is visible to the
networks that it is connected to. Each interface connected to a network must be
configured with an IP address that is valid for that network. In many
configurations, in NAT/Route mode all of the FortiGate interfaces are on different
networks, and each network is on a separate subnet.
You would typically use NAT/Route mode when the FortiCarrier-5001A security
system is deployed as a gateway between private and public networks. In the
default NAT/Route mode configuration, the FortiCarrier-5001A security system
functions as a firewall. Firewall policies control communications through the
FortiCarrier-5001A security system. No traffic can pass through the
FortiCarrier-5001A security system until you add firewall policies.
In NAT/Route mode, firewall policies can operate in NAT mode or in Route mode.
In NAT mode, the FortiGate firewall performs network address translation before
IP packets are sent to the destination network. In Route mode, no translation
takes place.
Figure 9: Example FortiCarrier-5001A board operating in NAT/Route mode
NAT mode policies
controlling traffic between
internal and external
networks.
192.168.1.99
In Transparent mode, the FortiCarrier-5001A security system is invisible to the
network. All of the FortiCarrier-5001A interfaces are connected to different
segments of the same network. In Transparent mode you only have to configure a
management IP address so that you can connect to the FortiCarrier-5001A
security system to make configuration changes and so the FortiCarrier-5001A
security system can connect to external services such as the FortiGuard
Distribution Network (FDN).
Internet
port2
FortiCararier-5001A board
204.23.1.2
in NAT/Route mode
port1
Internal Network
FortiCarrier-5001A Security System Guide
Quick Configuration Guide
01-400-91945 -20090223
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