ZyWALL 2 and ZyWALL 2WE

2.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), ZyXEL’s Single User Account feature (the SUA Only option).

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

4.Many One to One: In Many-One-to-One mode, the ZyWALL maps each local IP address to a unique global IP address.

5.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-to-OneNAT mappingtypes.

The following table summarizes these types.

Table 12-2 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-One-to-One

ILA1ÅÆ IGA1

M-1-1

 

ILA2ÅÆ IGA2

 

 

ILA3ÅÆ IGA3

 

 

…

 

 

 

 

NAT

12-5