QUOTE(jcp @ Nov 7 2009, 11:25 PM)

then use ubuntu. very often isp cant track what you are doing then. just use a virtual machine.
ISPs can (sort of) track your Internet usage, regardless of what OS you use -- in fact, your IP traffic is OS-agnostic (it looks the same no matter what OS you use). The reason ISPs can detect that you're using BitTorrent is (a) BitTorrent generally operates over certain well-known ports (although this can be changed), and (b) BitTorrent packets look different from HTTP packets, which look different from POP3 packets, which look different from AIM packets, and so on. Combining these methods, ISPs can use
traffic shaping to eliminate or reduce BitTorrent traffic on a network. That's actually the whole point of BitTorrent encryption -- to encrypt packets such that they won't
look like BitTorrent packets.
In summary, switching to Ubuntu won't suddenly make it possible to use BitTorrent, if your ISP is filtering traffic (which some, like Comcast, have been known to do).