MacNN | Comcast caught throttling BitTorrent traffic:
Comcast has been deliberately slowing down traffic for customers using file sharing apps on its network, the Associated Press confirmed today. Beginning an investigation after speaking with a Broadband Reports user who discovered the practice shortly after Comcast began testing the platform in August, the journalist group has learned that Comcast is using technology from Sandvine that interjects itself between users running specific peer-to-peer software, including BitTorrent clients as well as programs accessing the Gnutella file sharing network. The Sandvine software can detect when complete files are being traded and breaks the connection between peers, forcing a downloading user to look for an alternative.
The service does not completely eliminate such traffic but is enough to substantially hinder download speeds on a standard connection; users can partially avoid the issue by encrypting the data packets to prevent a Sandvine scan but are rarely able to regain full speed for those files, according to the report. Comcast has officially denied implementing any performance-altering software beyond optimizations but has been unable to account for the contradictory results.