ZyXEL Communications P-334 - Manual (Page 90)

Prestige 334 User’s Guide
89 Chapter 7 Network Address Translation (NAT) Screens
Figure 28 NAT Application With IP Alias
7.1.5 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
• One to One: In One-to-One mode, the Prestige maps one local IP address to one global
IP address.
• Many to One: In Many-to-One mode, the Prestige 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 Prestige maps the
multiple local IP addresses to shared global IP addresses.
• Many One-to-One: In Many-One-to-One mode, the Prestige 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.