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EMG2926-Q10A User’s Guide
146
C
HAPTER
21
Universal Plug-and-Play (UPnP)
21.1
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.
21.2
What You Need to Know
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.
21.2.1
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.
21.2.2
Cautions with UPnP
The automated nature of NAT traversal 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.
When a UPnP device joins a network, it announces its presence with a multicast message. For
security reasons, the EMG2926-Q10A allows multicast messages on the LAN only.
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Chapter 21 Universal Plug-and-Play (UPnP)
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147
All UPnP-enabled devices may communicate freely with each other without additional configuration.
Disable UPnP if this is not your intention.
21.3
UPnP Screen
Use this screen to enable UPnP on your EMG2926-Q10A.
Click
Management > UPnP
to display the screen shown next.
Figure 88
Management > UPnP
The following table describes the fields in this screen.
21.4
Technical Reference
The sections show examples of using UPnP.
21.4.1
Using UPnP in Windows XP Example
This section shows you how to use the UPnP feature in Windows XP. You must already have UPnP
installed in Windows XP and UPnP activated on the EMG2926-Q10A.
Make sure the computer is connected to a LAN port of the EMG2926-Q10A. Turn on your computer
and the EMG2926-Q10A.
21.4.1.1
Auto-discover Your UPnP-enabled Network Device
1
Click
start
and
Control Panel
. Double-click
Network Connections
. An icon displays under
Internet Gateway.
2
Right-click the icon and select
Properties
.
Table 58
Management > UPnP
LABEL
DESCRIPTION
UPnP
Select
Enable
to activate UPnP. Be aware that anyone could use a UPnP application to
open the web configurator's login screen without entering the EMG2926-Q10A's IP
address (although you must still enter the password to access the web configurator).
Apply
Click
Apply
to save the setting to the EMG2926-Q10A.
Cancel
Click
Cancel
to return to the previously saved settings.
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Chapter 21 Universal Plug-and-Play (UPnP)
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148
Figure 89
Network Connections
3
In the
Internet Connection Properties
window, click
Settings
to see the port mappings there
were automatically created.
Figure 90
Internet Connection Properties
4
You may edit or delete the port mappings or click
Add
to manually add port mappings.
Figure 91
Internet Connection Properties: Advanced Settings
Page 149 / 236
Chapter 21 Universal Plug-and-Play (UPnP)
EMG2926-Q10A User’s Guide
149
Figure 92
Internet Connection Properties: Advanced Settings: Add
Note: When the UPnP-enabled device is disconnected from your computer, all port
mappings will be deleted automatically.
5
Select
Show icon in notification area when connected
option and click
OK
. An icon displays in
the system tray.
Figure 93
System Tray Icon
6
Double-click on the icon to display your current Internet connection status.
Figure 94
Internet Connection Status
21.4.2
Web Configurator Easy Access
With UPnP, you can access the web-based configurator on the EMG2926-Q10A without finding out
the IP address of the EMG2926-Q10A first. This comes helpful if you do not know the IP address of
the EMG2926-Q10A.
Follow the steps below to access the web configurator.
1
Click
Start
and then
Control Panel
.
2
Double-click
Network Connections
.
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Chapter 21 Universal Plug-and-Play (UPnP)
EMG2926-Q10A User’s Guide
150
3
Select
My Network Places
under
Other Places
.
Figure 95
Network Connections
4
An icon with the description for each UPnP-enabled device displays under
Local Network
.
5
Right-click on the icon for your EMG2926-Q10A and select
Invoke
. The web configurator login
screen displays.
Figure 96
Network Connections: My Network Places
6
Right-click on the icon for your EMG2926-Q10A and select
Properties
. A properties window
displays with basic information about the EMG2926-Q10A.

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