#30639: Tor tries so connect over IPv6 in IPv4 networks with
ClientAutoIPv6ORPort
set
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Reporter: gk | Owner: (none)
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: tbb-wants | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by teor):
This bug is caused by an interaction between tor and Tor Browser:
1. Tor speculatively tries IPv4 and IPv6
2. Some of those connections fail
3. Tor Browser sets DisableNetwork on any failure
Here are some solutions that probably won't work:
* we could try to auto-detect IPv4 or IPv6 addresses (#27492), but that's
not reliable, because:
* local addresses don't guarantee internet connectivity
* some OSes and security configs don't allow tor to read local network
information
* we could downgrade the warning on the Tor side, but that might have
unintended consequences for other applications that use tor
* if fiddling with warning levels is our best option, we could defer the
warning for 30? seconds, and cancel the pending warning if another tor
connection succeeds
Here's a solution that would work, but we need to schedule it in tor's
roadmap:
* we could implement a proper "happy eyeballs" style connection design in
tor, where we always choose an IPv4 and IPv6 address for every connection,
try both, and use the first one that works
Here's a fix that Tor Browser should implement anyway:
* stop setting DisableNetwork on tor's first connection failure, because
tor's next connection attempt might work
Here's a quick fix that restores the previous behaviour (and re-opens
#29641):
* revert the change that added ClientAutoIPv6ORPort to Tor Browser alpha
Let me know how you'd like to move forward, and what you need the network
team to do.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30639#comment:3>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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