ZyXEL Communications P-3202HN-Ba, User Manual

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Chapter 9 Network Address Translation (NAT)
IAD User’s Guide
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9.6.4 NAT Application
The following figure illustrates a possible NAT application, where three inside LANs
(logical LANs using IP alias) behind the IAD can communicate with three distinct
WAN networks.
Figure 50 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 IAD maps one local IP address to one
global IP address.
• Many to One: In Many-to-One mode, the IAD 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).
Corporation B
NAT Server
192.168.3.1
LAN3: 192.168.3.X
Network Server
“R&D”=192.168.3.1
WAN Addresses: LAN Addresses: (Default IPs)
IGA 1
---------------> 192.168.1.1
IGA 2 ---------------> 192.168.2.1
IGA 3 ---------------> 192.168.3.1
NAT Server
192.168.2.1
LAN2: 192.168.2.X
Network Server
“Sales”=192.168.2.1
Server in
R&D Network
=IP3 (IGA 3)
NAT Server
192.168.1.1
LAN2: 192.168.1.X
Network Server
“Admin”=192.168.1.1
Corporation A
Server in
Sales Network
=IP2 (IGA 2)
Server in
Admin Network
=IP1 (IGA 1)