Nat Application; Nat Mapping Types - ZyXEL Communications P-792H User Manual

Chapter 8 Network Address Translation (NAT)

8.6.4 NAT Application

The following figure illustrates a possible NAT application, where three inside LANs
(logical LANs using IP alias) behind the P-792H v2 can communicate with three
distinct WAN networks.
Figure 48 NAT Application With IP Alias

8.6.5 NAT Mapping Types

NAT supports five types of IP/port mapping. They are:
• One to One: In One-to-One mode, the P-792H v2 maps one local IP address to
one global IP address.
• Many to One: In Many-to-One mode, the P-792H v2 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 P-792H v2
maps the multiple local IP addresses to shared global IP addresses.
• Many-to-Many No Overload: In Many-to-Many No Overload mode, the P-
792H v2 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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P-792H v2 User's Guide