IronPort Systems ZyAIR B-4000 - Manual (Page 143)

ZyAIR B-4000 Hot Spot Gateway
LAN Devices 16-1
Chapter 16
LAN Devices
This chapter describes how you can remotely access devices on the LAN through the ZyAIR.
16.1 LAN Devices and NAT Overview
NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host in a
packet. For 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 ZyAIR is a NAT-enabled device that makes your whole inside network appear as a single computer
to the outside world.
16.1.1 Port Mapping
To make LAN devices behind the ZyAIR visible to the outside world, you configure a mapping between a
virtual port on the ZyAIR and a server port on a LAN device. A virtual port is a port on the ZyAIR 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 ZyAIR using port mapping. You
can access the management interface on the LAN device remotely provided that the LAN device has
allowed remote management.
16.2 Configuring LAN Devices Port Mapping
Click ADVANCED and LAN DEVICES to display the screen as shown next.