Fortinet FortiGate Series Administration Guide

Firewall Virtual IP Configuring virtual IPs
FortiGate Version 4.0 MR1 Administration Guide
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4 Select OK.
To add a static NAT virtual IP for a single IP address to a firewall policy
Add a external to dmz1 firewall policy that uses the virtual IP so that when users on the
Internet attempt to connect to the web server IP address packets pass through the
FortiGate unit from the external interface to the dmz1 interface. The virtual IP translates
the destination address of these packets from the external IP to the DMZ network IP
address of the web server.
1 Go to Firewall > Policy and select Create New.
2 Configure the firewall policy:
3 Select NAT.
4 Select OK.
Adding a static NAT virtual IP for an IP address range
The IP address range 192.168.37.4-192.168.37.6 on the Internet is mapped to
10.10.10.42-10.10.123.44 on a private network. Packets from Internet computers
communicating with 192.168.37.4 are translated and sent to 10.10.10.42 by the FortiGate
unit. Similarly, packets destined for 192.168.37.5 are translated and sent to 10.10.10.43,
and packets destined for 192.168.37.6 are translated and sent to 10.10.10.44. The
computers on the Internet are unaware of this translation and see three computers with
individual IP addresses rather than a FortiGate unit with a private network behind it.
External IP
Address/Range
The Internet IP address of the web server.
The external IP address is usually a static IP address obtained from your
ISP for your web server. This address must be a unique IP address that is
not used by another host and cannot be the same as the IP address of the
external interface the virtual IP will be using. However, the external IP
address must be routed to the selected interface. The virtual IP address and
the external IP address can be on different subnets. When you add the
virtual IP, the external interface responds to ARP requests for the external IP
address.
Mapped IP
Address/Range
The IP address of the server on the internal network. Since there is only one
IP address, leave the second field blank.
Source Interface/Zone external
Source Address All (or a more specific address)
Destination Interface/Zone dmz1
Destination Address simple_static_nat
Schedule always
Service HTTP
Action ACCEPT

Fortinet FortiGate Series Specifications

General

Brand	Fortinet
Model	FortiGate Series
Category	Firewall
Language	English