ZyXEL Communications 91-009-073003B ユーザーズマニュアル

 Chapter 6 Configuration Basics

ZyWALL USG 50 User’s Guide

Dynamic DNS maps a domain name to a dynamic IP address. The ZyWALL helps 
maintain this mapping. 

Use Network Address Translation (NAT) to make computers on a private network 
behind the ZyWALL available outside the private network. 

The ZyWALL only checks regular (through-ZyWALL) firewall rules for packets that 
are redirected by NAT, it does not check the to-ZyWALL firewall rules. 

Example: Suppose you have an FTP server with a private IP address connected to 
a DMZ port. You could configure a NAT rule to forwards FTP sessions from the 
WAN to the DMZ. 

Click Configuration > Network > NAT to configure the NAT entry. Add an entry.

Name the entry.

Select the WAN interface that the FTP traffic is to come in through.

Specify the public WAN IP address where the ZyWALL will receive the FTP packets.

In the Mapped IP field, list the IP address of the FTP server. The ZyWALL will 
forward the packets received for the original IP address.

In Mapping Type, select Port.

Enter 21 in both the Original and the Mapped Port fields.

Configure this feature to have the ZyWALL transparently forward HTTP (web) 
traffic to a proxy server. This can speed up web browsing because the proxy server 
keeps copies of the web pages that have been accessed so they are readily 
available the next time one of your users needs to access that page.

Interface

Interfaces, addresses (HOST)