- Billion ADSL Modem/Router With Single Ethernet Port User's Manual

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

…