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One other nice benefit of IPv6? It seems that ISP's are less likely to mess with it. I use a Hurricane Electric tunnel and have not had any issues with YouTube videos on Time Warner, Comcast, or Charter. In the meantime, other customers of at least Time Warner and Comcast have reported lots of issues with network throttling.

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Hurricane Electric itself blocks some things though, for example you can't use IRC on standard ports through a HE tunnel.

This used to be a per-tunnel setting that you could turn on yourself. Now it seems that you need to email their support for approval (after completing the certification to the Sage level which isn't hard). I agree, this kind of sucks, but then again, I haven't had issues actually using IRC at all so I'm pretty happy.

If you tunnel somewhere, it doesn't matter (to how your ISP can treat it) if you send IPv4 or IPv6 over your tunnel

Right. It helps that YouTube supports IPv6 so this is all transparent to me. There's also a difference between a protocol 41 tunnel and a VPN: most VPN's encrypt the traffic so the ISP cannot mess with it at all (other than slowing down all VPN traffic), while with protocol 41 they can detect it and do deep packet inspection, but they currently don't seem to take it this far.

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