Figure 8-2 Nat Application With Ip Alias; Table 8-2 Nat Mapping Types - ZyXEL Communications Prestige 662HW Series User Manual

8.1.5 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.
Port numbers do not change for One-to-One and Many-to-Many No Overload NAT mapping types.
The following table summarizes these types.
One-to-One
Many-to-One (SUA/PAT)
Network Address Translation (NAT) Screens

Figure 8-2 NAT Application With IP Alias

Table 8-2 NAT Mapping Types

TYPE IP MAPPING
ILA1
ILA1
Prestige 662HW Series User's Guide
SMT ABBREVIATION
IGA1 1:1
IGA1 M:1
8-3