Chapter 17 Network Address Translation (NAT)

 

Table 115 ADVANCED > NAT > NAT Overview (continued)

 

LABEL

DESCRIPTION

 

WAN 1, 2

 

 

 

 

 

Enable NAT

Select this check box to turn on the NAT feature for the WAN interface. Clear this

 

 

check box to turn off the NAT feature for the WAN interface.

 

 

 

 

Address

Select SUA if you have just one public WAN IP address for your ZyWALL. This lets

 

Mapping Rules

the ZyWALL use its permanent, pre-defined NAT address mapping rules.

 

 

Select Full Feature if you have multiple public WAN IP addresses for your ZyWALL.

 

 

This lets the ZyWALL use the address mapping rules that you configure. This is the

 

 

equivalent of what used to be called full feature NAT or multi-NAT.

 

 

The bar displays how many of the ZyWALL's possible address mapping rules are

 

 

configured. The first number shows how many address mapping rules are

 

 

configured on the ZyWALL. The second number shows the maximum number of

 

 

address mapping rules that can be configured on the ZyWALL.

 

 

 

 

Port Forwarding

The bar displays how many of the ZyWALL's possible port forwarding rules are

 

Rules

configured. The first number shows how many port forwarding rules are configured

 

 

on the ZyWALL. The second number shows the maximum number of port

 

 

forwarding rules that can be configured on the ZyWALL.

 

 

 

 

Port Triggering

The bar displays how many of the ZyWALL's possible trigger port rules are

 

Rules

configured. The first number shows how many trigger port rules are configured on

 

 

the ZyWALL. The second number shows the maximum number of trigger port rules

 

 

that can be configured on the ZyWALL.

 

 

 

 

Copy to WAN 2

Click Copy to WAN 2 (or Copy to WAN 1) to duplicate this WAN interface's NAT

 

(and Copy to

port forwarding or trigger port rules on the other WAN interface.

 

WAN 1)

 

 

 

Note: Using the copy button overwrites the other WAN interface's

 

 

existing rules.

 

 

The copy button is best suited for initial NAT configuration where you have

 

 

configured NAT port forwarding or trigger port rules for one interface and want to

 

 

use similar rules for the other WAN interface. You can use the other NAT screens to

 

 

edit the NAT rules after you copy them from one WAN interface to the other.

 

 

 

 

Apply

Click Apply to save your changes back to the ZyWALL.

 

 

 

 

Reset

Click Reset to begin configuring this screen afresh.

 

 

 

17.4 NAT Address Mapping

Click ADVANCED > NAT > Address Mapping to open the following screen.

17.4.1 What NAT Does

In the simplest form, NAT changes the source IP address in a packet received from a subscriber (the inside local address) to another (the inside global address) before forwarding the packet to the WAN side. When the response comes back, NAT translates the destination address (the inside global address) back to the inside local address before forwarding it to the original inside host. Note that the IP address (either local or global) of an outside host is never changed.

See Section 17.1 on page 385 for more on NAT.

Use this screen to change your ZyWALL’s address mapping settings.

 

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ZyWALL 2WG User’s Guide