Specifications

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Start Port No. field above and then enter it again in this field.
To forward a series of ports, enter the last port number in a
series that begins with the port number in the Start Port No. field
above.
Local IP
Address
Enter your server IP address in this field.
Let's say you want to assign ports 22-25 to one server, port 80 to another and
assign a default server IP address of 192.168.1.35 as shown in the next figure.
6.4 Selecting the NAT Mode
Click Advanced Setup then NAT to open the following screen chose Multiple
(Numbers of IP).