ZyXEL Communications P-2302R Series User Manual

P-2302R Series User’s Guide

Chapter 12 Network Address Translation (NAT) Screens

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The following figure illustrates a possible NAT application, where three inside LANs (logical 
LANs using IP Alias) behind the Prestige can communicate with three distinct WAN 
networks. More examples follow at the end of this chapter.

Figure 47   NAT Application With IP Alias

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

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

IP address.

• Many to One: In Many-to-One mode, the Prestige 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 Prestige maps the 

multiple local IP addresses to shared global IP addresses.

• Many One-to-One: In Many-One-to-One mode, the Prestige 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.