Figure 15-2 Nat Application With Ip Alias - ZyXEL Communications ZyWALL 5 User Manual

15.1.5 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
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 Only 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.
Port numbers do not change for One-to-One and Many-One-to-
One NAT mapping types.
The following table summarizes these types.
NAT

Figure 15-2 NAT Application With IP Alias

ZyWALL 5 Internet Security Appliance
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