Hi all! I started a little late on this years GSoC project[0] which is about reducing the RTT of preemptively built circuits. Since begin of July I have been working on scripts for Tor path generation and Stream-RTT probing. For the path generation script "path_finder.py" I decided not to reimplement Tor's path generation logic but to ask a Tor client to choose a path without actually building it. I have written two small patches for Tor which implement the following new control commands: -) "DUMPGUARDS" removes all entry guards. (This might also be handy to work around the path selection strangeness when guards are disabled[1]). -) "FINDPATH" tells the Tor client to generate a path but do not build a circuit from it. To verify the correctness of the approach I am currently generating a few million paths and will look into the distribution of nodes. The Stream-RTT-probing script "rttprober.py" is also in a working state. Though it needs some more testing, it is already able to spawn multiple threads where each builds a circuit and runs a number of probes on that circuit, measuring the RTTs of the stream and the circuit build time. I will hopefully be able to get useful Stream-RTT-data soon to tackle the first interesting questions. All scripts and patches are available online[2]. Best, Robert [0] https://www.google-melange.com/gsoc/project/google/gsoc2013/ra_/19001 [1] https://trac.torproject.org/projects/tor/ticket/9188 [2] https://bitbucket.org/ra_/tor-rtt
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