Chapter 17 Network Address Translation (NAT)
The following example has two web servers on a LAN. Server A uses IP address 192.168.1.33 and server B uses 192.168.1.34. Both servers use port 80. The letters a.b.c.d represent the WAN port’s IP address. The ZyWALL translates port 8080 of traffic received on the WAN port (IP address a.b.c.d) to port 80 and sends it to server A (IP address 192.168.1.33). The ZyWALL also translates port 8100 of traffic received on the WAN port (also IP address a.b.c.d) to port 80, but sends it to server B (IP address 192.168.1.34).
"In this example, anyone wanting to access server A from the Internet must use port 8080. Anyone wanting to access server B from the Internet must use port 8100.
Figure 222 Port Translation Example
17.6 Port Forwarding Screen
Click ADVANCED > NAT > Port Forwarding to open the Port Forwarding screen.
"If you do not assign a Default Server IP address, the ZyWALL discards all packets received for ports that are not specified here or in the remote management setup.
Refer to Appendix D on page 653 for port numbers commonly used for particular services.
"The last port forwarding rule is reserved for Roadrunner services. The rule is activated only when you set the WAN Encapsulation to Ethernet and the Service Type to something other than Standard.
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