ZyXEL Communications ZyXEL ZyWALL 70: 6 NAT

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6 NAT

NAT (Network Address Translation - NAT, RFC 1631) means the translation of an IP address in one network 

to a different IP address in another. You can use the 

NAT Address Mapping

 screens to have the ZyWALL 

translate multiple public IP addresses to multiple private IP addresses on your LAN (or DMZ).

The following example allows access from the WAN to an HTTP (web) server on the DMZ. The server has a 

private IP address of 10.0.0.20.

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Specify an IP address and subnet mask for the 

DMZ interface. 

If you use private IP addresses on the DMZ, 

use NAT to make the servers publicly 

accessible (see 

Section 6

).

A public IP address must be on a separate 

subnet from the WAN port’s public IP address. 

If you do not configure NAT for the public IP 

addresses on the DMZ, the ZyWALL routes 

traffic to the public IP addresses on the DMZ 

without performing NAT. This may be useful for 

hosting servers for NAT unfriendly 

applications.

3

Click 

Apply

.