ZyXEL Communications eir F1000 - Page 155

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eir F1000 Modem User’s Guide
Chapter 9 Network Address Translation (NAT)
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 81 Multiple Servers Behind NAT Example
A=192.168.1.33
B=192.168.1.34
LAN
192.168.1.1
WAN
IP Address assigned by ISP
C=192.168.1.3
D=192.168.1.36
Click Network Setting > NAT > Port Forwarding to open the following screen.
See Appendix F on page 347 for port numbers commonly used for particular services.
Figure 82 Network Setting > NAT > Port Forwarding
The following table describes the fields in this screen.
Table 54 Network Setting > NAT > Port Forwarding
LABEL
DESCRIPTION
Add new rule
Click this to add a new rule.
#
This is the index number of the entry.
Status
This field displays whether the NAT rule is active or not. A yellow bulb signifies that this rule
is active. A gray bulb signifies that this rule is not active.
Service Name
This shows the service’s name.
WAN Interface
This shows the WAN interface through which the service is forwarded.
WAN IP
This field displays the incoming packet’s destination IP address.
Server IP
Address
This is the server’s IP address.
Start Port
This is the first external port number that identifies a service.
End Port
This is the last external port number that identifies a service.
Translation
Start Port
This is the first internal port number that identifies a service.
Translation End
Port
This is the last internal port number that identifies a service.