Planning the FortiGate configuration

Getting started

 

 

You must configure routing to support the redundant WAN1 and WAN2 internet connections. Routing can be used to automatically redirect connections from an interface if its connection to the external network fails.

You can add firewall policies to control whether communications through the FortiGate unit operate in NAT or Route mode. Firewall policies control the flow of traffic based on the source address, destination address, and service of each packet. In NAT mode, the FortiGate unit performs network address translation before it sends the packet to the destination network. In Route mode, there is no address translation.

You typically use NAT/Route mode when the FortiGate unit is operating as a gateway between private and public networks. In this configuration, you would create NAT mode firewall policies to control traffic flowing between the internal, private network and the external, public network (usually the Internet).

If you have multiple internal 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.

Figure 6: Example NAT/Route mode network configuration

 

 

 

 

 

 

 

 

Internal network

 

FortiGate-60 Unit

 

 

 

192.168.1.3

 

 

 

Internal

 

 

in NAT/Route mode

 

 

 

 

 

 

192.168.1.99

 

 

 

 

 

 

 

 

 

 

 

WAN1

 

 

 

 

 

 

 

 

Internet

204.23.1.5

INTERNAL

 

 

 

 

 

Route mode policies

PWR STATUS 1

2

3

4

DMZ

WAN1

WAN2

 

controlling traffic between

 

 

 

 

 

 

 

 

 

 

LINK 100

LINK 100

LINK 100

LINK 100

LINK 100

LINK 100

LINK 100

 

internal networks.

 

 

 

 

 

 

 

 

DMZ

DMZ network

 

NAT mode policies controlling

 

10.10.10.1

 

 

 

 

traffic between internal and

 

 

 

 

 

external networks.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10.10.10.2

NAT/Route mode with multiple external network connections

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:

WAN1 is the default interface to the external network (usually the Internet).

WAN2 is the redundant interface to the external network. You can also use the modem interface as a redundant connection to the external network.

Internal is the interface to the internal network.

You must configure routing to support redundant Internet connections. Routing can be used to automatically redirect connections from an interface if its connection to the external network fails.

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Fortinet Inc.

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Fortinet 60c manual NAT/Route mode with multiple external network connections, Example NAT/Route mode network configuration