ZyXEL Communications AMG1302 User Manual

 Chapter 11 Network Address Translation (NAT)

AMG1302/AMG1202-TSeries User’s Guide

• One to One: In One-to-One mode, the AMG1302/AMG1202-TSeries maps one local IP address 

to one global IP address.

• Many to One: In Many-to-One mode, the AMG1302/AMG1202-TSeries 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 AMG1302/AMG1202-TSeries 

maps the multiple local IP addresses to shared global IP addresses.

• Many-to-Many No Overload: In Many-to-Many No Overload mode, the AMG1302/AMG1202-

TSeries 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.

Port numbers do NOT change for One-to-One and Many-to-Many No Overload NAT mapping 
types.

The following table summarizes these types.

NAT Mapping Types

One-to-One

ILA1 IGA1

Many-to-One (SUA/PAT)

ILA1 IGA1

ILA2 IGA1

…

Many-to-Many Overload

ILA1 IGA1

ILA2 IGA2

ILA3 IGA1

ILA4 IGA2

…

Many-to-Many No Overload

ILA1 IGA1

ILA2 IGA2

ILA3 IGA3

…

Server

Server 1 IP IGA1

Server 2 IP IGA1

Server 3 IP IGA1