Zyxel-communications P-660HN-TxA Manual de usuario descargar pdf (Pagina 148)

Chapter 9 Network Address Translation (NAT)

P-660HN-TxA User’s Guide

148

9.6.4 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.

Figure 72 NAT Application With IP Alias

9.6.5 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.

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Zyxel-communications P-660HN-TxA Manual de usuario Pagina 148