Cautions With Upnp; Upnp Screen - ZyXEL Communications NBG-419N User Manual

Chapter 23 Universal Plug-and-Play (UPnP)
• 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.

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
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NBG-419N User's Guide