ZyXEL Communications NBG420N - Manual (Page 138)

Chapter 11 Network Address Translation (NAT)
NBG420N User’s Guide
138
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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.
11.2.2 Configuring Servers Behind Port Forwarding Example
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 89 Multiple Servers Behind NAT Example
11.3 General NAT Screen
Click Network > NAT to open the General screen.
Figure 90 Network > NAT > General