My connection was really slow today so I ran netstat to see if there was something weird going on. The first five entries surprised me:
Proto Local Address Foreign Address State TCP 10.100.2.3:2869 DJ-Blade:62606 TIME_WAIT TCP 10.100.2.3:2869 DJ-Blade:62607 TIME_WAIT TCP 10.100.2.3:2869 DJ-Blade:62609 TIME_WAIT TCP 10.100.2.3:2869 DJ-Blade:62611 TIME_WAIT TCP 10.100.2.3:2869 DJ-Blade:62618 TIME_WAIT
I looked in Explorer, and under network was a machine labelled DJ-Blade, which I'm assuming is my roommate's. From what I can find it seems port 2869 is used in UPnP and SSDP discovery, from http://support.microsoft.com/default.aspx?scid=kb;en-us;832017. I checked my sharing settings, and for some reason I was in a homegroup I hadn't joined before. Once I left that, there were two final entries from DJ:
TCP 10.100.2.3:5357 DJ-Blade:62757 TIME_WAIT TCP 10.100.2.3:52864 DJ-Blade:wsd TIME_WAIT
The first entry on port 5357 is for network discovery, which I just disabled. I'm just concerned about the mysterious homegroup and the fact that I've never seen any of my roommates show up here. Is this normal?