Which likely means that your network disallows tunneling and other things too. SixXS is not meant to bypass network policies. Please talk to your network operator to what is allowed and not. They likely are blocking whatever you call "p2p" because of legal policies in place in your area or the fact that your network would become overloaded when their users are filling up their pipes which then in turns hurts all the users. Depends on the tunneling protocol used and the tools they use for checking the traffic. Neither the protocol-41 based tunnels or AYIYA is encrypted, thus an analyzer tool can easily look inside. Cisco analyzers, Wireshark etc support even AYIYA thus I guess anything should easily note it. Most Windows hosts do IPv6 per default, but using Teredo. As such, you might want to check what your settings are locally (address, routing tables etc). A website is unable to tell you these...