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ZyWALL 10/50 Internet Security Gateway
9-4 NAT
Figure 9-2 NAT Application With IP Alias
9.1.5 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.
2. Many to One: In Many-to-One mode, the ZyWALL maps multiple local IP addresses to one global IP
address. This is equivalent to SUA (i.e., PAT, port address translation), ZyXEL’s Single User Account
feature that previous ZyXEL routers supported (the SUA Only option in today’s routers).