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P-660R-Tx v2 Series User’s Guide
69 Chapter 7 Network Address Translation (NAT) Screens
• 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.
Note: Port numbers do not change for One-to-One and Many-to-Many No
Overload NAT mapping types.
The following table summarizes these types.
7.2 SUA (Single User Account) Versus NAT
SUA (Single User Account) is a ZyNOS implementation of a subset of NAT that supports two
types of mapping, Many-to-One and Server. The ZyXEL Device also supports Full
Feature NAT to map multiple global IP addresses to multiple private LAN IP addresses of
clients or servers using mapping types as outlined in Table 15 on page 69.
Table 15 NAT Mapping Types
TYPE IP MAPPING
One-to-One ILA1ÅÆ IGA1
Many-to-One (SUA/PAT) ILA1ÅÆ IGA1
ILA2ÅÆ IGA1
…
Many-to-Many Overload ILA1ÅÆ IGA1
ILA2ÅÆ IGA2
ILA3ÅÆ IGA1
ILA4ÅÆ IGA2
…
Many-to-Many No Overload ILA1ÅÆ IGA1
ILA2ÅÆ IGA2
ILA3ÅÆ IGA3
…
Server Server 1 IPÅÆ IGA1
Server 2 IPÅÆ IGA1
Server 3 IPÅÆ IGA1