Nat 1:1 And Nat Loopback Examples; Figure 173 Nat 1:1 Example Network Topology - ZyXEL Communications ZyWALL 1050 User Manual

Internet security appliance

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Table of Contents

Chapter 16 Virtual Servers

16.3 NAT 1:1 and NAT Loopback Examples

The following sections provide examples of manually configuring NAT 1:1 mapping and a

policy route rule for NAT loopback. These are provided for your reference, you can select

options in the Virtual Server Add/Edit screen to have the ZyWALL automatically configure

these for you instead of configuring them manually.

NAT 1:1 Example

In this example, there is an SMTP mail server in the LAN zone. It has a private IP address of

192.168.1.21. The public IP address for the server is 1.1.1.1 and is on the ge3 interface.

In order for the server to be accessible to people from the Internet (WAN zone), you need to

create a 1:1 NAT mapping from the public IP address to the server's private one.

The firewall is enabled, so you also need to create a rule to allow traffic in from the WAN

192.168.1.21

ge2: 1.1.1.1

ZyWALL 1050 User's Guide