ZyXEL p-660r-t1 v2 Manual Do Utilizador

P-660R-Tx v2 Series User’s Guide

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Chapter 7 Network Address Translation (NAT) Screens

• One to One: In One-to-One mode, the ZyXEL Device maps one local IP address to one 

global IP address.

• Many to One: In Many-to-One mode, the ZyXEL Device maps multiple local IP 

addresses to one global IP address. This is equivalent to SUA (for instance, PAT, port 
address translation), ZyXEL’s Single User Account feature that previous ZyXEL routers 
supported (the SUA Only option in today’s routers). 

• Many to Many Overload: In Many-to-Many Overload mode, the ZyXEL Device maps 

the multiple local IP addresses to shared global IP addresses.

• Many-to-Many No Overload: In Many-to-Many No Overload mode, the ZyXEL Device 

maps each local IP address to a unique global IP address. 

• Server: This type allows you to specify inside servers of different services behind the 

NAT to be accessible to the outside world.

Note: Port numbers do not change for One-to-One and Many-to-Many No 

Overload NAT mapping types. 

The following table summarizes these 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 ZyXEL Device also supports Full 
Feature NAT to map multiple global IP addresses to multiple private LAN IP addresses of 
clients or servers using mapping types as outlined in 

Table 15   NAT Mapping Types

One-to-One

ILA1ÅÆ IGA1

Many-to-One (SUA/PAT)

ILA1ÅÆ IGA1
ILA2ÅÆ IGA1
…

Many-to-Many Overload

ILA1ÅÆ IGA1
ILA2ÅÆ IGA2
ILA3ÅÆ IGA1
ILA4ÅÆ IGA2
…

Many-to-Many No Overload

ILA1ÅÆ IGA1
ILA2ÅÆ IGA2
ILA3ÅÆ IGA3
…

Server

Server 1 IPÅÆ IGA1
Server 2 IPÅÆ IGA1
Server 3 IPÅÆ IGA1