Nat Application; Nat Mapping Types - ZyXEL Communications P-2612HW Series User Manual

Chapter 9 Network Address Translation (NAT)

9.5.4 NAT Application

The following figure illustrates a possible NAT application, where three inside LANs
(logical LANs using IP alias) behind the ZyXEL Device can communicate with three
distinct WAN networks.
Figure 118 NAT Application With IP Alias
Corporation B
LAN2: 192.168.1.X
Network Server
"Admin=192.168.1.1
NAT Server
192.168.1.1
LAN2: 192.168.2.X
Network Server
"Sales"=192.168.2.1
NAT Server
192.168.2.1
LAN3: 192.168.3.X
Network Server
"R&D"=192.168.3.1

9.5.5 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. 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).
182
NAT Server
192.168.3.1
Corporation A
Server in
Admin Network
=IP1 (IGA 1)
Internet
WAN Addresses: LAN Addresses: (Default IPs)
IGA 1 ---------------> 192.168.1.1
IGA 2 ---------------> 192.168.2.1
IGA 3 ---------------> 192.168.3.1
P-2612HW Series User's Guide
Server in
Sales Network
=IP2 (IGA 2)
Server in
R&D Network
=IP3 (IGA 3)