Nat Mapping Types; Table 6-2 Nat Mapping Types - ZyXEL Communications ZyXEL ZYWALL10 User Manual

6.1.4 NAT Mapping Types

NAT supports five types of IP/port mapping. They are:
1. One to One: In One-to-One mode, the ZyWALL maps one local IP address to one global IP address.
2. Many to One: In Many-to-One mode, the ZyWALL maps multiple local IP addresses to one global IP
address. This is equivalent to SUA (i.e., PAT, port address translation), ZyXEL's Single User Account
feature that previous ZyXEL routers supported (the SUA Only option in today's routers).
3. Many to Many Overload: In Many-to-Many Overload mode, the ZyWALL maps the multiple local IP
addresses to shared global IP addresses.
4. Many to Many No Overload: In Many-to-Many No Overload mode, the ZyWALL maps the each local
IP addresses to unique global IP addresses.
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
The following table summarizes these types.
One-to-One
Many-to-One (SUA/PAT)
Many-to-Many Overload
Many-to-Many No Overload
NAT
mapping types.

Table 6-2 NAT Mapping Types

TYPE
ILA1!" IGA1
ILA1!" IGA1
ILA2!" IGA1
...
ILA1!" IGA1
ILA2!" IGA2
ILA3!" IGA1
ILA4!" IGA2
...
ILA1!" IGA1
ILA2!" IGA2
ILA3!" IGA3
...
ZyWALL 10 Internet Security Gateway
IP MAPPING SMT ABBREVIATION
1:1
M:1
M:M Ov
M:M No Ov
6-3