ZyXEL Communications NBG410W3G Series User Manual

 Chapter 12 Network Address Translation (NAT)

NBG410W3G Series User’s Guide

Figure 138   Port Restricted Cone NAT Example

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 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 although, it is highly recommended that you use 
the DMZ port for these servers instead.

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Port numbers do not change for One-to-One and Many-One-to-One NAT 
mapping types. 

1, A

2, B

3, C

4, D

4, E

5