ZyXEL g-2000 plusv2 Mode D'Emploi

ZyXEL G-2000 Plus v2 User’s Guide

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Chapter 8 Single User Account (SUA) / Network Address Translation (NAT)

Figure 40   NAT Application With IP Alias

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

• One to One: In One-to-One mode, the ZyXEL device maps one local IP address to one 

global IP address.

• Many to One: In Many-to-One mode, the ZyXEL device 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 ZyXEL device maps 

the multiple local IP addresses to shared global IP addresses.

• Many One-to-One: In Many-One-to-One mode, the ZyXEL device 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.

The following table summarizes these types.