ZyXEL Communications 10 - Manual (Page 146)

ZyWALL 10~100 Series Internet Security Gateway
12-4 NAT
12.1.4 NAT Application
The following figure illustrates a possible NAT application, where three inside LANs (logical LANs using
IP Alias) behind the ZyWALL can communicate with three distinct WAN networks. More examples follow
at the end of this chapter.
Figure 12-2 NAT Application With IP Alias
12.1.5 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
1. One to One: In One-to-One mode, the ZyWALL maps one local IP address to one global IP address.