Draytek Vigor2500V Manual page 102

UPnP (Universal Plug and Play)
10.1 Introduction
The UPnP protocol is intended to bring to network connected devices,
the ease of installation and configuration which is already available for
directly connected PC peripherals with the existing Windows 'Plug and
Play' system.
For NAT routers, the major feature of UPnP on the Vigor router is "NAT
Traversal". This enables applications inside the firewall to automatically
open the ports that they need to pass through a router.
reliable than requiring a router to work out by itself which ports need to be
opened and without the user having to manually set up port mappings or
a DMZ.
UPnP is available on Windows XP and the Vigor router provides the
associated support for MSN Messenger to allow full use of the voice,
video and messaging features.
Chapter 10
10-1
Vigor2500V series
It is more