Electronic Frontier Foundation has released a tool few days ago to test if your ISP is blocking some kinds of traffic like Bittorrent and VoIP. The tool is named Switzerland and released under Open Source.
Switzerland is designed to detect the modification or injection of packets of data traveling over IP networks, including those introduced by anti-P2P tools from Sandvine (widely believed to be used by Comcast to interfere with BitTorrent uploads) and AudibleMagic, advertising injection systems like FairEagle, censorship systems like the Great Firewall of China, and other systems that we don’t know about yet.
Switzerland is a command line tool that is still in alpha and can be downloaded from here. Since this is an alpha release download only if you are comfortable in testing alpha and beta products.
Is that legal for ISPs to do?
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To: Jay, from August 13, 2008:
What’s legal for a corporation to do is whatever that company’s lobby or its industry’s lobby has paid to legislators to make such illicit activities legal.