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5 nat mapping types, Figure 90 nat application with ip alias – ZyXEL Communications P-2602HWLNI User Manual

Page 157

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Chapter 10 Network Address Translation (NAT) Screens

P-2602HWLNI User’s Guide

157

Figure 90 NAT Application With IP Alias

10.1.5 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.