Figure 182 Create A Firewall Rule; Figure 183 Lan Computer Queries The Dns Server - ZyXEL Communications ZyWALL USG 300 User Manual

Unified security gateway

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Figure 182 Create a Firewall Rule

NAT Loopback Example

NAT 1:1 Example on page 287

LAN SMTP mail server to allow users to access the SMTP mail server from the WAN. LAN

users can also use an IP address to access the mail server. However, you need to configure

NAT loopback for LAN users to use a domain name to access the server.

A LAN user computer at IP address 192.168.1.89 queries the domain name (xxx.LAN-

SMTP.com in this example) from a public DNS server and gets the SMTP server's 1-1 NAT

mapped public IP address of 1.1.1.1.

ZyWALL USG 300 User's Guide

maps a public IP address to the private IP address of a

xxx.LAN-SMTP.com = ?

192.168.1.21

Chapter 16 Virtual Servers

xxx.LAN-SMTP.com = 1.1.1.1

192.168.1.89