#32657: Investigate Snowflake blocking in China -------------------------------------+--------------------------- Reporter: cohosh | Owner: cohosh Type: defect | Status: assigned Priority: High | Milestone: Component: Circumvention/Snowflake | Version: Severity: Normal | Resolution: Keywords: blocking, china | Actual Points: Parent ID: | Points: Reviewer: | Sponsor: Sponsor28 -------------------------------------+---------------------------
Comment (by cohosh): Even though all the file downloads failed, there is still some data getting through (at least for a while). I took a look at the logs and noticed some Tor connections through snowflake are fully bootstrapping from the VPS: {{{ [1] "Number of failed downloads: 100" [1] "Average throughput (KB/s): NaN" [1] "Standard deviation: NA" [1] "Number of failed snowflakes: 42" [1] "Number of full bootstraps: 49" [1] "Average bootstrap progress: 56.95" }}} If a snowflake doesn't bootstrap past 10% I counted it as failed. It looks like about half of boostraps succeeded. This is much lower than the > 90% success rate we get from a VPS in North America, and the fact that '''all''' file downloads fail is also concerning. These connections are over UDP, so they can't be blocked by sending a RST packet. It's possible that the GFW is more actively monitoring and blocking snowflake IP addresses, or that there is some forced packet loss happening that snowflake can't handle well. -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32657#comment:1> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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