User's Manual

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7.3.3 NAT Application
The following figure illustrates a possible NAT application, where three inside LANs (logical
LANs using IP Alias) behind the router can communicate with three distinct WAN networks.
More examples follow at the end of this chapter.
7.3.4 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
a. One-to-One: In One-to-One mode, the TC3162 EVM maps one local IP address to one
global IP address.
b. Many-to-One: In Many-to-One mode, the TC3162 EVM maps multiple local IP addresses to
one global IP address.
c. Many-to-Many Overload: In Many-to-Many Overload mode, the TC3162 EVM maps
multiple local IP addresses to shared global IP addresses.
d. Many-to-Many No Overload: In Many-to-Many No Overload mode, the TC3162 EVM maps
each local IP address to a unique global IP address.
e. Server: This type allows you to specify inside servers of different services behind the NAT
to be accessible to the outside world.
The following table summarizes these types.