#25723: Multiplex - one client splits traffic across multiple proxies ------------------------------------------+-------------------------- Reporter: dcf | Owner: dcf Type: defect | Status: assigned Priority: Low | Milestone: Component: Circumvention/Snowflake | Version: Severity: Normal | Resolution: Keywords: anti-censorship-roadmap-2020 | Actual Points: Parent ID: #19001 | Points: Reviewer: | Sponsor: ------------------------------------------+--------------------------
Comment (by dcf): Replying to [comment:10 cohosh]: > Sounds great. As far as weighting it based on proxy bandwidth or latency, can we use something similar to the connection migration you mentioned in [https://github.com/net4people/bbs/issues/14#issuecomment-542898991 one of your initial TurboTunnel posts]? That way if more packets are coming through one snowflake, more packets will be sent out to it? Or is this going to choke out the other snowflakes too easily? I was actually thinking about weighting at the client, so connection migration at the server wouldn't come into it. But now that you mention it, some kind of prioritization may be necessary at the server as well-- currently all proxies for a client will pull from the outgoing queue equally and perhaps undo whatever prioritization the client tried to use-- though I'm not sure what would actually happen. It may interact in weird ways with SCTP's congestion control in the DataChannel layer. What I was thinking is that the client keeps a moving average of bandwidth for each of its current proxies (using EWMA or something), then allocates sends based on the ratios of those bandwidth averages. So if proxy A has recently done 100 KB/s and proxy B has 50 KB/s, you send 2/3 on proxy A and 1/3 on proxy B. But that may not be a good idea because there's not a way for a proxy to "recover" and get prioritized after the client has decided it's slower. Honestly for a first draft I would just prioritize proxies uniformly (either round-robin or uniform random selection per send) and see if the backpressure of SCTP or other layers automatically causes convergence to a good ratio. -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25723#comment:11> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
_______________________________________________ tor-bugs mailing list tor-bugs@lists.torproject.org https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-bugs