Planning The Fortigate Configuration; Nat/Route Mode - Fortinet FortiGate 50A Installation And Configuration Manual

Getting started

Planning the FortiGate configuration

NAT/Route mode

FortiGate-50A Installation and Configuration Guide
Unfiltered content profile
Use the unfiltered content profile if you do not want to apply content protection to
traffic. You can add this content profile to firewall policies for connections between
highly trusted or highly secure networks where content does not need to be protected.
Table 9: Unfiltered content profile
Options
Antivirus Scan
File Block
Web URL Block
Web Content Block
Web Script Filter
Web Exempt List
Email Block List
Email Exempt List
Email Content Block
Oversized File/Email Block
Pass Fragmented Emails
Before you configure the FortiGate unit, you need to plan how to integrate the unit into
the network. Among other things, you must decide whether you want the unit to be
visible to the network, which firewall functions you want it to provide, and how you
want it to control the traffic flowing between its interfaces.
Your configuration plan depends on the operating mode that you select. The FortiGate
unit can be configured in one of two modes: NAT/Route mode (the default) or
Transparent mode.
In NAT/Route mode, the unit is visible to the network. Like a router, all its interfaces
are on different subnets. The following interfaces are available in NAT/Route mode:
• External is the interface to the external network (usually the Internet).
• Internal is the interface to the internal network.
You can add security policies to control whether communications through the
FortiGate unit operate in NAT or Route mode. Security 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 translation.
By default, the FortiGate unit has a NAT mode security policy that allows users on the
internal network to securely download content from the external network. No other
traffic is possible until you have configured further security policies.
Planning the FortiGate configuration
HTTP FTP IMAP
pass pass pass
POP3 SMTP
pass pass
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