ZyWALL 2 Series User’s Guide

Many to One: In Many-to-One mode, the ZyWALL maps multiple local IP addresses to one global IP address. This is equivalent to SUA (i.e., PAT, port address translation), the Single User Account feature (the SUA Only option).

Many to Many Overload: In Many-to-Many Overload mode, the ZyWALL maps the multiple local IP addresses to shared global IP addresses.

Many One to One: In Many-One-to-One mode, the ZyWALL 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-Oneand Many-One-toOneNAT mapping types.

TABLE 8-2 NAT MAPPING TYPES

TYPE

IP MAPPING

SMT ABBREVIATION

 

 

 

 

One-to-One

ILA1

IGA1

1-1

 

 

 

 

Many-to-One (SUA/PAT)

ILA1

IGA1

M-1

 

ILA2

IGA1

 

 

…

 

 

 

 

 

 

Many-to-Many Overload

ILA1

IGA1

M-M Ov

 

ILA2

IGA2

 

 

ILA3

IGA1

 

 

ILA4

IGA2

 

 

…

 

 

 

 

 

 

Many-One-to-One

ILA1

IGA1

M-1-1

 

ILA2

IGA2

 

 

ILA3

IGA3

 

 

…

 

 

 

 

 

 

Server

Server 1 IP

IGA1

Server

 

Server 2 IP

IGA1

 

 

Server 3 IP

IGA1

 

 

 

 

 

The following table summarizes these types.

8.2Using NAT

You must create a firewall rule in addition to setting up SUA/NAT, to allow traffic

from the WAN to be forwarded through the ZyWALL.

8-4

NAT