ZyXEL Communications P-660 series Guía de usuario descargar pdf (Pagina 77)

Chapter 6 Network Address Translation (NAT) Screens

P-660R-F1 Series User’s Guide

6.1.4 NAT Application

The following figure illustrates a possible NAT application, where three inside LANs (logical LANs

using IP Alias) behind the ZyXEL Device can communicate with three distinct WAN networks. More

examples follow at the end of this chapter.

Figure 41 NAT Application With IP Alias

6.1.5 NAT Mapping Types

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 (for instance, PAT, port address translation), ZyXEL’s

Single User Account feature that previous ZyXEL routers supported (the SUA Only option in

today’s routers).

• 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-to-Many No Overload:

In Many-to-Many No Overload 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.

Port numbers do NOT change for One-to-One and Many-to-Many No Overload NAT mapping

types.

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ZyXEL Communications P-660 series Guía de usuario Pagina 77