Zyxel VMG1312-B10B [187/394] Wan lan

Chapter 11 Network Address Translation (NAT)

VMG1312-B10B / VMG1312-B30B Series User’s Guide

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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 75 Multiple Servers Behind NAT Example

Click Network Setting > NAT > Port Forwarding to open the following screen.

See Appendix G on page 379 for port numbers commonly used for particular services.

Figure 76 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.

A=192.168.1.33

D=192.168.1.36

C=192.168.1.3

B=192.168.1.34

WAN

LAN

192.168.1.1

IP Address assigned by ISP