Table 97 Nat Mapping Types - ZyXEL Communications ZyWall 35 User Manual

ZyWALL 35 User's Guide
• One to One: In One-to-One mode, the ZyWALL maps one local IP address to one global
IP address.
• 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 (the SUA option).
• Many to Many Overload: In Many-to-Many Overload mode, the ZyWALL maps the
multiple local IP addresses to shared global IP addresses.
• Many One to One: In Many-One-to-One mode, the ZyWALL 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 although, it is highly recommended that you
use the DMZ port for these servers instead.
The following table summarizes these types.

Table 97 NAT Mapping Types

TYPE
One-to-One
Many-to-One (SUA/PAT)
Many-to-Many Overload
Many-One-to-One
296
Note: Port numbers do not change for One-to-One and Many-
One-to-One NAT mapping types.
IP MAPPING
Server
ILA1 IGA1
ILA1 IGA1
ILA2 IGA1
...
ILA1 IGA1
ILA2 IGA2
ILA3 IGA1
ILA4 IGA2
...
ILA1 IGA1
ILA2 IGA2
ILA3 IGA3
...
Server 1 IP IGA1
Server 2 IP IGA1
Server 3 IP IGA1
Chapter 16 Network Address Translation (NAT)
SMT ABBREVIATION
1-1
M-1
M-M Ov
M-1-1
Server