ZyXEL Communications 50 User Manual
ZyWALL 50 Internet Security Gateway
NAT 6-5
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
types.
The following table summarizes these types.
Table 6-2 NAT Mapping Types
TYPE
IP MAPPING
SMT ABBREVIATION
One-to-One ILA1ÅÆ IGA1
1:1
Many-to-One (SUA/PAT)
ILA1ÅÆ IGA1
ILA2ÅÆ IGA1
…
M:1
Many-to-Many Overload
ILA1ÅÆ IGA1
ILA2ÅÆ IGA2
ILA3ÅÆ IGA1
ILA4ÅÆ IGA2
…
M:M Ov
Many-to-Many No Overload
ILA1ÅÆ IGA1
ILA2ÅÆ IGA2
ILA3ÅÆ IGA3
…
M:M No Ov
Server
Server 1 IPÅÆ IGA1
Server 2 IPÅÆ IGA1
Server 3 IPÅÆ IGA1
Server