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6.1.5 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
1. One to One: In One-to-One mode, the BIPAC 5100S maps one local IP address to one
global IP address.
2. Many to One: In Many-to-One mode, the BIPAC 5100S maps multiple local IP addresses to
one global IP address. This is equivalent to SUA (for instance, PAT, port address translation),
Billion’s Single User Account feature that previous Billion routers supported (the SUA Only
option in today’s routers).
3. Many to Many Overload: In Many-to-Many Overload mode, the BIPAC 5100S maps the
multiple local IP addresses to shared global IP addresses.
4. Many-to-Many No Overload: In Many-to-Many No Overload mode, the BIPAC 5100S maps
each local IP address to a unique global IP address.
5. 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.
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
ILA4 IGA2
…