said by Juggernaut:
Yep. I think it's on by default in pretty much every router. The funny thing is, I can't think of a reason why it should even be there.
I think its so people using certain services can get out to the net, like torrent or a game or program instead of having to set port forwarding. Portforward = port always open, upnp only opens the port when you launch an app. Correct me if im wrong, if I am I will also disable it on my router and see how it plays on the net with my apps!
Side note , if i remember correctly some mobos even have upnp in the bios, do you disable that too?