ZyWALL 10/50 Internet Security Gateway

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 the each local IP addresses to unique global IP addresses.

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 mapping types.

The following table summarizes these types.

Table 9-2 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

 

 

…

 

 

 

 

Server

Server 1 IPÅÆ IGA1

Server

 

Server 2 IPÅÆ IGA1

 

 

Server 3 IPÅÆ IGA1

 

 

 

 

NAT

9-5