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 |
| … | |
| | 37 |
