Cable Router User's Guide

Chapter 6 Network Address Translation (NAT) Screens
P-2900-4HB User’s Guide
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6.3.4 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
• One to One: In One-to-One mode, the ZyXEL Device maps one local IP address
to one global IP address.
• Many to One: In Many-to-One mode, the ZyXEL Device maps multiple local IP
addresses to one 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 NAT mapping type.
The following table summarizes these types.
Table 14 NAT Mapping Types
TYPE IP MAPPING
One-to-One ILA1ÅÆ IGA1
Many-to-One ILA1ÅÆ IGA1
ILA2ÅÆ IGA1
…
Server Server 1 IPÅÆ IGA1
Server 2 IPÅÆ IGA1
Server 3 IPÅÆ IGA1