ZyXEL Communications Prestige 645R-A Series, User Manual, Page: 60 / 251

Prestige 645R-A Series User’s Guide
6-4 NAT
4. 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.
5. 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.
Table 6-2 NAT Mapping Types
TYPE IP MAPPING SMT ABBREVIATION
One-to-One ILA1 IGA1 1:1
Many-to-One (SUA/PAT) ILA1 IGA1
ILA2 IGA1
…
M:1
Many-to-Many Overload ILA1 IGA1
ILA2 IGA2
ILA3 IGA1
ILA4 IGA2
…
M:M Ov
Many-to-Many No Overload ILA1 IGA1
ILA2 IGA2
ILA3 IGA3
…
M:M No OV
Server Server 1 IP IGA1
Server 2 IP IGA1
Server 3 IP IGA1
Server
6.2 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 Prestige 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 6-2 .