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|Why You Should Disable Universal Plug-and-Play (UPnP)|
|How and Why You Should Stealth Port 113|
|GMail - Westel VersaLink Gateway 327W|
|Computer Tips Index|
I recommend that you disable UPnP on your router and manually make port forwarding changes only when necessary. When UPnP is enabled on your router, usually by default, some programs can open ports on your router without notification. This behavior is supposed to help when certain applications have difficulty communicating with the Internet, but could be a problem if a malicious program or intruder, like a trojan horse, wants to gain access to your network and computers.
NAT traversal technology allows network applications to detect that they are behind a UPnP-enabled NAT device. Then the applications can learn the shared, globally-routable IP address, and configure port mappings to forward packets from the external port of the NAT to the internal port used by the application—and all automatically so the user doesn't have to manually configure port mappings. NAT traversal allows network devices or peer-to-peer applications to traverse a NAT gateway by dynamically opening and closings ports for communication with outside services. - Sharon Crawford, July 22, 2002