Universal Plug-And-Play (Upnp); Overview; What You Need To Know; Nat Traversal - ZyXEL Communications LTE2566-M634 User Manual

Universal Plug-and-Play

18.1 Overview

This chapter introduces the UPnP feature in the Web Configurator.
Universal Plug and Play (UPnP) is a distributed, open networking standard that uses TCP/IP for simple
peer-to-peer network connectivity between devices. A UPnP device can dynamically join a network,
obtain an IP address, convey its capabilities and learn about other devices on the network. In turn, a
device can leave a network smoothly and automatically when it is no longer in use.

18.2 What You Need to Know

UPnP hardware is identified as an icon in the Network Connections folder (Windows 7). Each UPnP
compatible device installed on your network will appear as a separate icon. Selecting the icon of a
UPnP device will allow you to access the information and properties of that device.

18.2.1 NAT Traversal

UPnP NAT traversal automates the process of allowing an application to operate through NAT. UPnP
network devices can automatically configure network addressing, announce their presence in the
network to other UPnP devices and enable exchange of simple product and service descriptions. NAT
traversal allows the following:
• Dynamic port mapping
• Learning public IP addresses
• Assigning lease times to mappings
Windows Messenger is an example of an application that supports NAT traversal and UPnP.
See the NAT chapter for more information on NAT.

18.2.2 Cautions With UPnP

The automated nature of NAT traversal applications in establishing their own services and opening
firewall may present network security issues. Network information and configuration may also be
obtained and modified by users in some network environments.
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