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    This is a great read. As a long-time (unfortunately) IPv6 tunnel user, I’m always amazed at how frequently Akamai can cock up PMTU within its network. Thumbs up to CloudFlare (thumbs down on their captcha showing up on every site I visit from Tor, but that’s another issue).

    Additional reading: http://en.wikipedia.org/wiki/Path_MTU_Discovery

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      Disclaimer: I work at CloudFlare, and I’m tangentially involved in our Tor working group.

      We’ve been working to improve the Tor stuff, but it’s a more difficult problem than it seems at first. Quite recently, we’ve been pushing some changes to make the Tor experience better, for what it’s worth.