Руководство Пользователя для ZyXEL P-791R v2

P-791R v2 Support Notes

13. What IP/Port mapping does Multi-NAT support?

Multi-NAT supports five types of IP/port mapping: 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),

• One to One: In One-to-One mode, the P-791R v2 maps one ILA to one

IGA.

• Many to One: In Many-to-One mode, the P-791R v2 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 is optional in today's P-791R v2 routers).

• Many to Many Overload: In Many-to-Many Overload mode, the

P-791R v2 maps multiple ILA to shared IGA.

• Many One-to-One: In Many One-to-One mode, the P-791R v2 maps

each ILA to unique IGA.

• Server: In Server mode, the P-791R v2 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 the five types.

NAT 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
...

Many

One-to-One

ILA1<--->IGA1
ILA2<--->IGA2
ILA3<--->IGA3
ILA4<--->IGA4
...

Server

Server 1 IP<--->IGA1