Chapter 17 Universal Plug-and-Play (UPnP)
AMG1202-T10A User’s Guide
179
When a UPnP device joins a network, it announces its presence with a multicast message. For 
security reasons, the ZyXEL Device 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. 
UPnP and ZyXEL
ZyXEL has achieved UPnP certification from the Universal Plug and Play Forum UPnP™ 
Implementers Corp. (UIC). ZyXEL's UPnP implementation supports Internet Gateway Device (IGD) 
1.0. 
See the following sections for examples of installing and using UPnP.
17.2  The UPnP Screen
Use the following screen to configure the UPnP settings on your ZyXEL Device. Click Advanced > 
UPnP to display the screen shown next.
See Section 17.1 on page 178 for more information. 
Figure 96   Advanced > UPnP > General
The following table describes the fields in this screen. 
Table 69   Advanced > UPnP > General
LABEL DESCRIPTION
Active 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 ZyXEL Device's IP address (although you must 
still enter the password to access the web configurator).
Allow users to make 
configuration changes 
through UPnP
Select this check box to allow UPnP-enabled applications to 
automatically configure the ZyXEL Device so that they can 
communicate through the ZyXEL Device, for example by using NAT 
traversal, UPnP applications automatically reserve a NAT forwarding 
port in order to communicate with another UPnP enabled device; this 
eliminates the need to manually configure port forwarding for the 
UPnP enabled application.