Configuring Servers Behind Port Forwarding Example; Port Forwarding Screen; Figure 57 Multiple Servers Behind Nat Example - ZyXEL Communications NBG-510S User Manual

Chapter 11 NAT and Firewall (WAN to LAN)
Some 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.

11.2.1 Configuring Servers Behind Port Forwarding Example

The following example shows the IP addresses of computers on the LAN. You can use port
forwarding to send web and FTP traffic to computer A at IP address 192.168.1.33 and Telnet
traffic to computer B at 192.168.1.34. You could make computer C (at 192.168.1.35) the
default. 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 57 Multiple Servers Behind NAT Example

11.3 Port Forwarding Screen

Port forwarding allows traffic from the WAN to be forwarded through the ZyXEL Device. To
change your ZyXEL Device's port forwarding settings, click Network > NAT > Port
Forwarding. The screen appears as shown. Use this screen to define the local servers to which
to forward incoming services.
If you do not assign a default host, the ZyXEL Device discards all packets
received for ports that are not specified in this screen or remote management.
Refer to Appendix B on page 177
82
for port numbers commonly used for particular services.
NBG-510S User's Guide