ZyAIR G-2000 Plus User’s Guide

Figure 55 NAT Application With IP Alias

10.1.5 NAT Mapping Types

NAT supports five types of IP/port mapping. They are:

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

•Many to One: In Many-to-One mode, the ZyAIR 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).

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

•Many One-to-One: In Many-One-to-One mode, the ZyAIR 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-One and Many

One-to-One NAT mapping types.

139

Chapter 10 Single User Account (SUA) / Network Address Translation (NAT)