Comment 32 for bug 411688

Just confirming that I'm seeing that kind of behavior on Fedora 19 too (so not ubuntu-specific), enabling the Multicast/RTP sender will cause constant UDP upload activity towards 224.0.0.56, in my case at ~180 KB/s. I think this explains my other computer (laptop) having trouble associating to the wifi, even though this desktop computer is connected through a wired connection.

My router is basically new hardware (Netgear WNR3500L/U/v2) running the Tomato firmware, and I really doubt that anything is at fault on that side.