ZyXEL N4100 User Guide - Page 163
LAN Devices, 19.1 Overview, 19.1.1 What You Can Do in this What You Need to Know
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CHAPTER 19 LAN Devices 19.1 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 N4100 is a NAT-enabled device that makes your whole inside network appear as a single computer to the outside world. This chapter describes how you can remotely access devices on the LAN through the N4100. 19.1.1 What You Can Do in this Chapter Use the LAN Devices screen (Section 19.2 on page 164) to configure port mapping on the N4100. 19.1.2 What You Need to Know The following terms and concepts may help as you read through this chapter. Port Mapping To make LAN devices behind the N4100 visible to the outside world, you configure a mapping between a virtual port on the N4100 and a server port on a LAN device. A virtual port is a port on the N4100 that appears as a physical port to the attached devices. A server port defines a server to which all specified requests are forwarded. N4100 User's Guide 163