Well DA-150N, User Manual

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User’s Guide Configuring your Computers
31
UPnP
UPnP is an architecture for pervasive peer-to-peer network
connectivity of intelligent appliances, Wireless devices, and PCs
of all form factors. It is designed to bring easy-to-use, flexible,
standards-based connectivity to ad-hoc or unmanaged
networks whether in the home, in a small business, public
spaces, or attached to the Internet. UPnP is a distributed, open
networking architecture that leverages TCP/IP and the Web
technologies to enable seamless proximity networking in
addition to control and data transfer among networked devices
in the home, office, and public spaces.
UPnP is more than just a simple extension of the plug and play
peripheral model. It is designed to support zero-configuration,
"invisible" networking, and automatic discovery for a breadth of
device categories from a wide range of vendors. This means a
device can dynamically join a network, obtain an IP address,
convey its capabilities, and learn about the presence and
capabilities of other devices. DHCP and DNS servers are
optional and are used only if available on the network. Finally, a
device can leave a network smoothly and automatically without
leaving any unwanted state behind.
The DSL device supports a control point for Universal Plug and
Play (UPnP) version 1.0, and supports two key features:
NAT
Traversal
and
Device Identification
. This feature requires one
active WAN interface. In addition, the host should support this
feature. In the presence of multiple WAN interfaces, select an
interface on which the incoming traffic is present.
With NAT Traversal, when an UPnP command is received to
open ports in NAT, the application translates the request into
system commands to open the ports in NAT and the firewall.
The interface to open the ports on is given to UPnP when it
starts up and is part of the configuration of the application.
For Device Identification, the application will send a description
of the DSL device as a control point back to the host making the
request.
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