ZyXEL Communications 5 Series User Manual

Chapter 22 Network Address Translation (NAT)

ZyWALL 5/35/70 Series User’s Guide

The following table summarizes the NAT mapping types.

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Port numbers do not change for One-to-One and Many-One-to-One NAT 
mapping types. 

SUA (Single User Account) is a ZyNOS implementation of a subset of NAT that supports two 
types of mapping: Many-to-One and Server. The ZyWALL also supports Full Feature NAT 
to map multiple global IP addresses to multiple private LAN IP addresses on your network.

When you select SUA, WAN-to-LAN and WAN-to-DMZ address translation is performed. If 
you want (some) computers on your DMZ to have public IP addresses, then select Full 
Feature (not SUA) and don’t configure NAT mapping rules to those computers with public IP 
addresses on the DMZ.

You must create a firewall rule in addition to setting up SUA/NAT, if you want to allow traffic 
originating from the WAN to be forwarded through the ZyWALL.

Click ADVANCED > NAT to open the NAT Overview screen. 

Table 129   NAT Mapping Types

One-to-One

ILA1 

IJ IGA1

1-1

Many-to-One (SUA/PAT)

ILA1 

IJ IGA1

ILA2 

IJ IGA1

…

M-1

Many-to-Many Overload

ILA 

IJ IGA1

ILA2 

IJ IGA2

ILA3 

IJ IGA1

ILA4 

IJ IGA2

…

M-M Ov

Many-One-to-One

ILA1 

IJ IGA1

ILA2 

IJ IGA2

ILA3 

IJ IGA3

…

M-1-1

Server

Server 1 IP 

IJ IGA1

Server 2 IP 

IJ IGA1

Server 3 IP 

IJ IGA1

Server