Prestige 660RU-Tx Series User’s Guide

•One to One: In One-to-One mode, the Prestige maps one local IP address to one global IP address.

•Many to One: In Many-to-One mode, the Prestige 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 Prestige maps the multiple local IP addresses to shared global IP addresses.

•Many-to-Many No Overload: In Many-to-Many No Overload mode, the Prestige 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-Oneand Many- to-Many No Overload NAT mapping types.

The following table summarizes these types.

Table 15 NAT Mapping Types

TYPE

IP MAPPING

SMT ABBREVIATION

 

 

 

One-to-One

ILA1ÅÆ IGA1

1:1

 

 

 

Many-to-One (SUA/PAT)

ILA1ÅÆ IGA1

M:1

 

ILA2ÅÆ IGA1

 

 

…

 

 

 

 

Many-to-Many Overload

ILA1ÅÆ IGA1

M:M Ov

 

ILA2ÅÆ IGA2

 

 

ILA3ÅÆ IGA1

 

 

ILA4ÅÆ IGA2

 

 

…

 

 

 

 

Many-to-Many No Overload

ILA1ÅÆ IGA1

M:M No OV

 

ILA2ÅÆ IGA2

 

 

ILA3ÅÆ IGA3

 

 

…

 

 

 

 

Server

Server 1 IPÅÆ IGA1

Server

 

Server 2 IPÅÆ IGA1

 

 

Server 3 IPÅÆ IGA1

 

 

 

 

7.2 SUA (Single User Account) Versus NAT

SUA (Single User Account) is a ZyNOS implementation of a subset of NAT that supports two types of mapping, Many-to-Oneand Server. The Prestige 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.

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Chapter 7 Network Address Translation (NAT) Screens