Table 6-2 Nat Mapping Types - ZyXEL Communications ZyXEL ZyWALL 50 User Manual

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 mapping
The following table summarizes these types.
TYPE
One-to-One
Many-to-One (SUA/PAT)
Many-to-Many Overload
Many-to-Many No Overload
Server
NAT
types.

Table 6-2 NAT Mapping Types

IP MAPPING
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
ZyWALL 50 Internet Security Gateway
SMT ABBREVIATION
1:1
M:1
M:M Ov
M:M No Ov
Server
6-5