57
WLAN ADSL2+ Router
9.0 Universal Plug-and-Play (UPnP)
9.1 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. An 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.
9.2 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.
9.3 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
Network Address Translation (NAT)
chapter for further information about NAT.
9.4 Cautions with UPnP
The automated nature of NAT traversal applications in establishing their own services may
present network security issues. Network information and configuration may also be obtained
and modified by users in some network environments.
All UPnP-enabled devices may communicate freely with each other without additional
configuration. Disable UPnP if this is not your intention.
UPnP broadcasts are only allowed on the LAN.
See later sections for examples of installing UPnP in Windows XP and Windows Me as well as
an example of using UPnP in Windows.
19216811.live