6381-A4 Router Users Guide
59
Advanced
The modem supports a multitude of advanced features. For basic modem functionality you do not
need to utilize these advanced features. The features help with routing, security, port
configuration, and plug-and-play capability.
UPnP
The 6381 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 an active WAN
connection. In addition, the PC should support this feature.
The UPnP application sits on top of a HTTP based socket listening for UPnP requests. With NAT
Traversal, when an UPnP command is received to open ports in NAT, the application translates
the request into IP table commands to open the ports in NAT and the firewall, mapping them back
to the IP address of the PC on the LAN making the request. The connection 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 6381 RG as a control point
back to the device making the request. An example of how this works is with Windows XP. You
can go into the network for Windows XP and you will see the RG represented. You can then click
on the RG and get access to its web pages.