Nat/Route Mode With Multiple External Network Connections - Fortinet FortiGate FortiGate-3016B Install Manual

Planning the FortiGate configuration

NAT/Route mode with multiple external network connections

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Figure 4: Example NAT/Route mode configuration.
Port1
Internet
NAT policies controlling
traffic between internal
and external networks.
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:
• Port 1 is the default interface to the external network (usually the Internet)
• Port 2 is the internal interface to the internal network
• Port 3 is the redundant interface to the external network
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 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.
FortiGate-3016B, FortiGate-3600A and FortiGate-3810A FortiOS 3.0 MR5 Install Guide
Port2
FortiGate-3600A
Port 3
Configuring
Internal
network
Route mode policies
controlling traffic between
Internal networks.
DMZ
network
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