Chapter 9 Network Address Translation (NAT)
P-79X Series User’s Guide
97
Figure 58 NAT Application With IP Alias
9.6.5 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
• One to One: In One-to-One mode, the P-79X maps one local IP address to one global IP
address.
• Many to One: In Many-to-One mode, the P-79X 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-79X 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-79X 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.
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