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C
HAPTER
23
Universal Plug-and-Play (UPnP)
23.1
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.
23.2
What You Can Do
Use the UPnP screen (
Section 23.4 on page 162
) to enable UPnP on your NBG-419N.
23.3
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.
23.3.1
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.
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23.3.2
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 NBG-419N allows multicast messages on the LAN only.
All UPnP-enabled devices may communicate freely with each other without additional configuration.
Disable UPnP if this is not your intention.
23.4
UPnP Screen
Use this screen to enable UPnP on your NBG-419N.
Click
Management > UPnP
to display the screen shown next.
Figure 112
Management > UPnP
The following table describes the fields in this screen.
23.5
Technical Refereance
The sections show examples of using UPnP.
Table 72
Management > UPnP
LABEL
DESCRIPTION
Enable the Universal Plug
and Play (UPnP) Feature
Select this check box to activate UPnP. Be aware that anyone could
use a UPnP application to open the web configurator's login screen
without entering the NBG-419N's IP address (although you must still
enter the password to access the web configurator).
Apply
Click
Apply
to save the setting to the NBG-419N.
Cancel
Click
Cancel
to return to the previously saved settings.
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23.5.1
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 NBG-419N.
Make sure the computer is connected to a LAN port of the NBG-419N. Turn on your computer and
the NBG-419N.
23.5.1.1
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
.
Figure 113
Network Connections
3
In the
Internet Connection Properties
window, click
Settings
to see the port mappings there
were automatically created.
Figure 114
Internet Connection Properties
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4
You may edit or delete the port mappings or click
Add
to manually add port mappings.
Figure 115
Internet Connection Properties: Advanced Settings
Figure 116
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 117
System Tray Icon
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6
Double-click on the icon to display your current Internet connection status.
Figure 118
Internet Connection Status
23.5.2
Web Configurator Easy Access
With UPnP, you can access the web-based configurator on the NBG-419N without finding out the IP
address of the NBG-419N first. This comes helpful if you do not know the IP address of the NBG-
419N.
Follow the steps below to access the web configurator.
1
Click
Start
and then
Control Panel
.
2
Double-click
Network Connections
.
19216811.live