What Is The Difference Between Sua And Multi-Nat - ZyXEL Communications P-2812HNU-51c Support Notes

In Server mode, the device 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
ILA1<--->IGA1
Many-to-One
ILA2<--->IGA1
(SUA/PAT)
...
ILA1<--->IGA1
ILA2<--->IGA2
Many-to-Many
ILA3<--->IGA1
Overload
ILA4<--->IGA2
...
ILA1<--->IGA1
ILA2<--->IGA2
Many-to-Many
ILA3<--->IGA3
No Overload
ILA4<--->IGA4
...
Server 1 IP<--->IGA1
Server
Server 2 IP<--->IGA1

What is the difference between SUA and Multi-NAT?

SUA (Single User Account) in previous ZyNOS versions is a NAT set with 2 rules,
Many-to-One and Server. The device now has Full Feature NAT support to map
global IP addresses to local IP addresses of clients or servers. With multiple global IP
addresses, multiple severs of the same type (e.g., FTP servers) are allowed on the
LAN for outside access. In previous ZyNOS versions that supported SUA 'visible'
servers had to be of different types. The device supports NAT sets on a remote node
basis. They are reusable, but only one set is allowed for each remote node. The
device supports 2 sets since there is only one remote node. The default SUA (Read
Only) is a convenient, pre-configured, read only, Many-to-One mapping set,
sufficient for most purposes and helpful to people already familiar with SUA in
previous ZyNOS versions.
All contents copyright (c) 2009 ZyXEL Communications Corporation.
P-2812HNU-51C Support Notes