I am looking for a (preferably open source) UPnP media server. I have found TwonkyVision (http://www.twonkyvision.de/UPnP/) which does what I want (serve mp3 files to a wireless media appliance) and there is even a free (but not open) version that has just enough functionality to get me by. But I would far prefer to use an Open Source alternative (if one exists) Anyone out there played with this stuff before ? Also in the installation instructions for TwonkyVision it says "Make sure that you have a multicast route set for the server by issuing a "route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0"." Not knowing much about multicast I thought I would pass this through the ALUG sanity filter. Is there a specific subnet reserved for multicast traffic that I must use (as defined in the above route statement) ? What happens if my local subnet is different ?