ZyXEL Communications Prestige 645R-A Series - Manual (Page 60)

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.