D-Link DFL-1600 User Manual page 139

14.3. Scenarios: IP Rules Configuration 119
Note
For NAT rules it is possible to specify the IP address that internal IP
addresses should be translated to. This can be done on the "NAT" tab
when configuring the rule. As default, the address of the destination
interface is used.
Example:
SAT rule
Publicly Accessible Server with a Private Address in a DMZ
Figure 14.1: SAT Example.
This example features a web server with a private address located in a
DMZ, and internal machines located on a local network that want to browse
the Internet. In order to enable external users to access the web server, the
server must be reachable from a public address. Thus, we translate port 80
on the firewalls external address to port 80 on the web server:
1. Add a "HTTP" service object that use TCP port 80.
D-Link Firewalls User's Guide