Справочник Пользователя для ZyXEL Communications G-2000 Plus

ZyAIR G-2000 Plus User’s Guide

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

Figure 55   NAT Application With IP Alias

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.