Chapter 8 Network Address Translation (NAT)

Figure 78 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

NAT Server 192.168.3.1

Corporation A

Server in Admin Network =IP1 (IGA 1)

Server in Sales Network =IP2 (IGA 2)

Server in R&D Network =IP3 (IGA 3)

WAN Addresses: LAN Addresses: (Default IPs)

IGA 1

---------------> 192.168.1.1

IGA 2

---------------> 192.168.2.1

IGA 3

---------------> 192.168.3.1

8.6.5 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).

•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.

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P-660HN-F1 User’s Guide