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UPnP 20-1
Chapter 20
Universal Plug-and-Play (UPnP)
This chapter introduces the UPnP feature in the web configurator.
20.1 Universal Plug and Play Overview
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.
20.1.1 How do I know if I'm using UPnP?
UPnP hardware is identified as an icon in the Network Connections folder (Windows XP). 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.
20.1.2 NAT Transversal
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 Transversal and UPnP.
See the Network Address Translation (NAT) chapter in your User's Guide for further information about
NAT.
20.1.3 Cautions with UPnP
The automated nature of NAT Transversal applications in establishing their own services and opening
firewall ports may present network security issues. Network information and configuration may also be
obtained and modified by users in some network environments.