I am using a Windows 2008 R2 server, and NPS to authenticate all my wireless AP's. It has worked beautifully until recently. Now, all my wireless AP's are producing horrible speeds. I'm getting ping times to local resources of like 400-2000 milliseconds! If I plug in, those immediately drop to 1-5.
I have done a little testing, and changed some of my AP's to regular WPA, with a key. When I do that, my ping times are considerably faster. So it appears to have something to do with NPS, but I could be wrong.
Most of my wireless routers are Linkys boxes. Either E1000, E2000, and E3000 machines running dd-wrt, or WRT54G routers.
I don't even know where else to look. Does anyone have any ideas?