ZyXEL Communications ZyXEL ZyWALL 2WG - Manual (Page 333)

Chapter 17 Network Address Translation (NAT)
ZyWALL 2WG User’s Guide
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• 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.
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Port numbers do not change for One-to-One and Many-One-to-One NAT
mapping types.
The following table summarizes the NAT mapping types.
17.2 Using NAT
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You must create a firewall rule in addition to setting up SUA/NAT, to allow
traffic from the WAN to be forwarded through the ZyWALL.
17.2.1 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 ZyWALL also supports Full Feature NAT
to map multiple global IP addresses to multiple private LAN IP addresses of clients or servers
using mapping types. Select either SUA or Full Feature in NAT Overview.
Table 110 NAT Mapping Types
TYPE IP MAPPING SMT ABBREVIATION
One-to-One ILA1 IJ IGA1 1-1
Many-to-One (SUA/PAT) ILA1 IJ IGA1
ILA2 IJ IGA1
… M-1
Many-to-Many Overload ILA IJ IGA1
ILA2 IJ IGA2
ILA3 IJ IGA1
ILA4 IJ IGA2
… M-M Ov
Many-One-to-One ILA1 IJ IGA1
ILA2 IJ IGA2
ILA3 IJ IGA3
… M-1-1
Server Server 1 IP IJ IGA1
Server 2 IP IJ IGA1
Server 3 IP IJ IGA1 Server