FortiGate Administration Guide - FirewallShop.com

Configuring virtual IPs
Firewall Virtual IP
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:
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
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.
Figure 197:Static NAT virtual IP for an IP address range example
To add a static NAT virtual IP for an IP address range
1 Go to Firewall > Virtual IP > Virtual IP.
2 Select Create New.
FortiGate Version 3.0 MR5 Administration Guide
312 01-30005-0203-20070830