ZyXEL Communications Corporation VSG1435B101 Manual De Usuario

 Chapter 12 Network Address Translation (NAT)

VSG1435-B101 Series User’s Guide

Note: Many residential broadband ISP accounts do not allow you to run any server 

processes (such as a Web or FTP server) from your location. Your ISP may 
periodically check for servers and may suspend your account if it discovers any 
active services at your location. If you are unsure, refer to your ISP.

Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in 
the example), port 80 to another (B in the example) and assign a default server IP 
address of 192.168.1.35 to a third (C in the example). You assign the LAN IP 
addresses and the ISP assigns the WAN IP address. The NAT network appears as a 
single host on the Internet.

Figure 63   Multiple Servers Behind NAT Example

Click Network Settings > NAT > Port Forwarding to open the following 
screen.

 for port numbers commonly used for particular 

services. 

Figure 64   Network Settings > NAT > Port Forwarding

A=192.168.1.33

D=192.168.1.36

C=192.168.1.3

B=192.168.1.34