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Chapter 15
UPnP
Universal Plug and Play Overview
15.1
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.
15.1.1
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.
15.1.2
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 SUA/NAT chapter for further information about NAT.
This chapter introduces the Universal Plug and Play feature.
Contivity 221 VPN Switch User's Guide
15-1
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