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7.1.4 NAT Application

The following figure illustrates a possible NAT application, where three inside LANs (logical LANs using IP Alias) behind the ADSL Router can communicate with three distinct WAN networks. More examples follow at the end of this chapter.

7.1.5 NAT Mapping Types

NAT supports five types of IP/port mapping. They are:

1.One to One: In One-to-One mode, the ADSL Router maps one local IP address to one global IP address.

2.Many to One: In Many-to-One mode, the ADSL Router maps multiple local IP addresses to one global IP address.

3.Many to Many Overload: In Many-to-Many Overload mode, the ADSL Router 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 ADSL Router 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

 

 

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