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.
55
TYPE IP MAPPING
One-to-One ILA1 IGA1
Many-to-One (SUA/PAT) ILA1 IGA1
ILA2 IGA1
…
Many-to-Many Overload ILA1 IGA1
ILA2 IGA2
ILA3 IGA1
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