ZyXEL Communications G-2000 Plus - Manual (Page 140)

ZyAIR G-2000 Plus User’s Guide
139 Chapter 10 Single User Account (SUA) / Network Address Translation (NAT)
Figure 55 NAT Application With IP Alias
10.1.5 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
• One to One: In One-to-One mode, the ZyAIR maps one local IP address to one global IP
address.
• Many to One: In Many-to-One mode, the ZyAIR 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 ZyAIR maps the
multiple local IP addresses to shared global IP addresses.
• Many One-to-One: In Many-One-to-One mode, the ZyAIR 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.
Note: Port numbers do not change for One-to-One and Many
One-to-One NAT mapping types.