ZyXEL Communications Prestige 861H-G1, User Manual

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Prestige 861H User’s Guide
Network Address Translation (NAT) Screens 8-3
Figure 8-2 NAT Application With IP Alias
8.1.5 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 (for instance, PAT, port address translation), ZyXEL’s
Single User Account feature that previous ZyXEL routers supported (the
SUA Only option in
today’s routers).
Many to Many Overload : In Many-to-Many Overload mode, the Prestige maps the multiple
local IP addresses to shared global IP addresses.
Many-to-Many No Overload : In Many-to-Many No Overload 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.
Port numbers do not change for One-to-One and Many-to-Many No Overload NAT mapping
types.
The following table summarizes these types.