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Re: [tor-bugs] #32657 [Circumvention/Snowflake]: Investigate Snowflake blocking in China
#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
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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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