[tor-talk] OBFS4 Blocking

[Flipchan]

Did u only try to connect to a bridge and proxy data throw it?

Justin <davisjustin002 at gmail.com> skrev: (17 november 2016 12:16:49 CET)
>Hi everyone,
>I’ve been doing research to see how some of the pluggable transports
>are getting blocked with DPI. I used a Cyberoam filter under my control
>for testing, and an iBoss filter at a different location.
>OBFS4 is blocked behind both filters. Cyberoam is doing some sort of
>timing attack, but I’m not sure what. When a bridge is used by lots of
>people, then it doesn’t work. Even enabling Iat mode=1 or 2 doesn’t fix
>the issue. When I tried a bridge with not many users, it worked no
>matter what Iat mode was set at. Behind iBoss, they are fingerprinting
>Packet Interarrival times. Iat mode 1 and 2 worked no matter how much
>load the bridges had on them.
>Hopefully this information can help people understand a little more
>about how these transports are filtered.
>Thanks,
>Justin.
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