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Chapter 9 Network Address Translation (NAT)
P-660HWP-Dx User’s Guide
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Figure 85 NAT Application With IP Alias
9.1.5 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
• One to One: In One-to-One mode, the P-660HWP-Dx maps one local IP address to one
global IP address.
• Many to One: In Many-to-One mode, the P-660HWP-Dx maps multiple local IP
addresses to one global IP address. This is equivalent to SUA (for instance, PAT, port
address translation), ZyXEL’s Single User Account feature that previous ZyXEL routers
supported (the SUA Only option in today’s routers).
• Many to Many Overload: In Many-to-Many Overload mode, the P-660HWP-Dx maps
the multiple local IP addresses to shared global IP addresses.
• Many-to-Many No Overload:
In Many-to-Many No Overload mode, the P-660HWP-Dx
maps each local IP address to a unique global IP address.
• Server: This type allows you to specify inside servers of different services behind the
NAT to be accessible to the outside world.
Port numbers do NOT change for One-to-One and Many-to-Many No Overload NAT
mapping types.