ZyXEL Communications 2602H-6XC manual What IP/Port mapping does Multi-NAT support?, One to One

Prestige 2602H-6xC Support Notes

What IP/Port mapping does Multi-NAT support?

NAT supports five types of IP/port mapping. They are: One to One, Many to One, Many to Many Overload, Many to Many No Overload and Server. The details of the mapping between ILA and IGA are described as below.Here we define the local IP addresses as the Internal Local Addresses (ILA) and the global IP addresses as the Inside Global Address (IGA),

1.One to One

In One-to-One mode, the Prestige maps one ILA to one IGA.

2.Many to One

In Many-to-One mode, the Prestige maps multiple ILA to one IGA. This is equivalent to SUA (i.e., PAT, port address translation), ZyXEL's Single User Account feature that previous ZyNOS routers supported (the SUA only option in today's routers).

3.Many to Many Overload

In Many-to-Many Overload mode, the Prestige maps the multiple ILA to shared IGA.

4.Many to Many No Overload

In Many-to-Many No Overload mode, the Prestige maps each ILA to unique IGA.

5.Server

In Server mode, the Prestige maps multiple inside servers to one global IP address. This allows us to specify multiple servers of different types behind the NAT for outside access. Note, if you want to map each server to one unique IGA please use the One-to-One mode.

The following table summarizes these types.

NAT Type	IP Mapping
One-to-One	ILA1<--->IGA1
Many-to-One	ILA1<--->IGA1
	ILA2<--->IGA1
(SUA/PAT)
	...
Many-to-Many	ILA1<--->IGA1

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