ZyXEL Communications 2304R-P1 - Manual (Page 88)

Prestige 2304 Support Notes
All contents copyright (c) 2005 ZyXEL Communications Corporation.
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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
(SUA/PAT)
ILA1<--->IGA1
ILA2<--->IGA1
...
Many-to-Many
Overload
ILA1<--->IGA1
ILA2<--->IGA2
ILA3<--->IGA1
ILA4<--->IGA2
...
Many-to-Many No
Overload
ILA1<--->IGA1
ILA2<--->IGA2
ILA3<--->IGA3
ILA4<--->IGA4
...
Server
Server 1 IP<--->IGA1
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 Prestige 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 Prestige supports NAT sets on a remote node basis. They are reusable, but only one set is
allowed for each remote node. The Prestige supports 2 sets since there is only one remote node. The default
SUA (Read Only) Set in menu 15.1 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.