There is an undocumented feature that Roku developers have found useful in debugging some issues. In today's world of switched hubs that lack a promiscuous mode, having tcpdump on the Roku box may enable some of you to more easily get a packet trace to aid debugging.
To enable tcpdump packet traces on the Roku box, enter the remote code: Home 5x, FF 3x, Rewind 2x
This brings you to a "secret" screen, where you can select: "enable debug logging"
tcpdump is now enabled on the box. It creates a circular log of packet traces that can be accessed at http://<ipaddrOfDvp>/pkgs/ in log0,log1, log2,log3 that can be filled circularly.
Once the log is downloaded to your host, you can view it in your favorite tcpdump viewer (mine's wireshark: http://www.wireshark.org/)