ZyXEL Communications P-660H-D Series 7.1.4 NAT Application, 7.1.5 NAT Mapping Types, Server, SUA Only, One to One, Many to One, No Overload, Many-to-Many, Many to Many Overload

P-660R/H-D Series User’s Guide

7.1.4 NAT Application

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 29 NAT Application With IP Alias

7.1.5 NAT Mapping Types

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 (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 Prestige maps the multiple local IP addresses to shared global IP addresses.

•Many-to-Many No Overload: In Many-to-Many No Overload 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.

Chapter 7 Network Address Translation (NAT) Screens 84