ZyXEL Communications P-660H-T1 v3s User Manual page 120

Chapter 8 Network Address Translation (NAT)
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).
Note: 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 45 Port Translation Example
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P-660H-T1v3s User's Guide