my isp is Comcast advertised speeds are 4000/368 i believe
i'm running windows xp sp2
cablenut tweak program
http://ttester.broadbandreports.com/tweak/block:24d67a8?service=cable&speed=4000&os=winXP&via=normal
tweak results
TCP/Web100 Network Diagnostic Tool v5.2.1e
click START to begin
Checking for Middleboxes . . . . . . . . . . . . . . . . . .