Well, OK, it depends on what you use.
It's only worth having UPnP enabled on the router *if* it is also enabled in Windows (requires 2 Services to be enabled & running: "Universal Plug 'N' Play Device Host" & "SSDP Discovery Service") *and* you have other software/hardware which makes use of it.
UPnP wiki entry:
http://en.wikipedia.org/wiki/UPNP
ADSLGuide review of the Voyager 2100 (lots of set up info, by the way):
http://www.adslguide.org.uk/hardware...oyager2100.asp
And from the ADSLGuide review of the earlier 2000:
http://www.adslguide.org.uk/hardware...q3/bt-2000.asp
Quote:
Universal Plug and Play (UPnP)
The Voyager 2000 supports UPnP which is enabled by default. UPnP is a standard that allows software running on a computer to open/close ports in a NAT router. This functionality is used by software like MSN Messenger that requires a wide range of random ports which makes the use of standard port forwarding impossible. MSN Messenger will run on any NAT based router with functionality limited to text chat, but UPnP makes it possible to hold video and voice conferences. Using UPnP is a two stage process. You must install it as an option in Windows XP as it is not installed by default.
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So if you want to do more than just text chatting on MSN, then it can be useful.
I just leave it turned off in XP & on my router.