ZyXEL Communications Vantage Service Gateway VSG-1200 V2 User Manual

VSG-1200 V2 User’s Guide

Chapter 21 LAN Devices

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This chapter describes how you can remotely access devices on the LAN through the VSG.

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a 
host in a packet. Form example, the source address of an outgoing packet, used within one 
network is changed to a different IP address known within another network.

Traditionally, when you have a device (for example, a switch) on a LAN using NAT, you 
cannot access the device from the WAN since the LAN device is assigned a private IP address.

Your VSG is a NAT-enabled device that makes your whole inside network appear as a single 
computer to the outside world.

To make LAN devices behind the VSG visible to the outside world, you configure a mapping 
between a virtual port on the VSG and a server port on a LAN device. A virtual port is a port 
on the VSG that appears as a physical port to the attached devices. A server port defines a 
server to which all specified requests are forwarded.

In addition, centralized LAN device management is possible through the VSG using port 
mapping. You can access the management interface on the LAN device remotely provided that 
the LAN device has allowed remote management.

Click Advanced and LAN Devices to display the LAN Device Management screen as 
shown.