User's Guide Part 1

Chapter 11 Network Address Translation (NAT)
AMG1302/AMG1202-TSeries User’s Guide
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• One t o One: In One-to-One mode, the AMG1302/AMG1202-TSeries maps one local IP address
to one global IP address.
• Ma n y t o One: In Many-to-One mode, the AMG1302/AMG1202-TSeries 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).
• Ma n y t o M any Ov e r loa d: In Many-to-Many Overload mode, the AMG1302/AMG1202-TSeries
maps the multiple local IP addresses to shared global IP addresses.
• Ma n y- t o- Ma n y N o Overload:
In Many-to-Many No Overload mode, the AMG1302/AMG1202-
TSeries maps each local IP address to a unique global IP address.
• Se r ver: 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 On e - t o- One and M a ny- t o- M a ny N o Over load NAT mapping
types.
The following table summarizes these types.
Table 53 NAT Mapping Types
TYPE IP MAPPING
One-to-One ILA1 IGA1
Many-to-One (SUA/PAT) ILA1 IGA1
ILA2 IGA1
…
Many-to-Many Overload ILA1 IGA1
ILA2 IGA2
ILA3 IGA1
ILA4 IGA2
…
Many-to-Many No Overload ILA1 IGA1
ILA2 IGA2
ILA3 IGA3
…
Server Server 1 IP IGA1
Server 2 IP IGA1
Server 3 IP IGA1