ZyXEL Communications P-660W-T1 v2, User Manual

Page: 101 / 244

Chapter 8 Network Address Translation (NAT) Screens
P-660W-Tx v2 User’s Guide
101
• 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. 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 ZyXEL Device maps
the multiple local IP addresses to shared global IP addresses.
• Many-to-Many No Overload : In Many-to-Many No Overload mode, the ZyXEL Device
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.
The following table summarizes these types.
8.3.6 SUA (Single User Account) Versus NAT
SUA (Single User Account) is a ZyNOS implementation of a subset of NAT that supports two
types of mapping,
Many-to-One and Server . The ZyXEL Device also supports Full
Feature NAT to map multiple global IP addresses to multiple private LAN IP addresses of
clients or servers using mapping types as outlined in Table 33 on page 101 .
• Choose SUA Only if you have just one public WAN IP address for your ZyXEL Device.
• Choose Full Feature if you have multiple public WAN IP addresses for your ZyXEL
Device.
Table 33 NAT Mapping Types
TYPE IP MAPPING
One-to-One ILA1 ÅÆ IGA1
Many-to-One (SUA/PAT) ILA1 ÅÆ IGA1
ILA2 ÅÆ IGA1
…
Many-to-Many Overload ILA1 ÅÆ IGA1
ILA2 ÅÆ IGA2
ILA3 ÅÆ IGA1
ILA4 ÅÆ IGA2
…
Many-to-Many No Overload ILA1 ÅÆ IGA1
ILA2 ÅÆ IGA2
ILA3 ÅÆ IGA3
…
Server Server 1 IP ÅÆ IGA1
Server 2 IP ÅÆ IGA1
Server 3 IP ÅÆ IGA1