ZyWALL 70 Support Notes
All contents copyright (c) 2005 ZyXEL Communications Corporation.
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1. One to One
In One-to-One mode, the ZyWALL maps one ILA to one IGA.
2. Many to One
In Many-to-One mode, the ZyWALL 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 ZyWALL maps the multiple ILA to shared IGA.
4. Many One to One
In Many One to One, the ZyWALL maps each ILA to unique IGA.
5. Server
In Server mode, the ZyWALL 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 One-to-One
ILA1<--->IGA1
ILA2<--->IGA2
ILA3<--->IGA3
ILA4<--->IGA4
...
Server
Server 1 IP<--->IGA1
Server 2 IP<--->IGA1
• SUA Versus Multi-NAT
