User's Manual

UTT Technologies Chapter 8 NAT
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from the ISP. Therein, 218.1.21.1/29 is used as the Internet connection¶s gateway IP
address, 218.1.21.2/29 is used as the Device¶s WAN1 interfacH¶s IP address.
The organization wants a LAN server (IP Address: 192.168.16.88) to open SMTP service
(Protocol: TCP; Port: 25) to the outside users. And the Device will use 2025 as the
external port and 218.1.21.3 as the external IP address.
Firstly, we need to create a NAT rule, and set its External IP Address to 218.1.21.3, see
section 8.3.5 How to Add the NAT Rules for detailed information. Then we need to
create the port forwarding rule, and select the NAT rule¶s ID (4 in this example) from the
Bind to drop-down list.
The following figure shows the detailed settings.
Figure 8-5 Port Forwarding Settings - Example Three