[tor-dev] connectivity failure for top 100 relays

[dawuud]

Out of 9900 possible two hop tor circuits among the top 100 tor relays
only 935 circuit builds have succeeded. This is way worse than the last
time I sent a report 6 months ago during the Montreal tor dev meeting.


Here's the scanner I use:

https://github.com/david415/tor_partition_scanner

(I was planning on improving this testing methodology in collaboration with
Katharina Kohls but was unable to travel to Bochum University because of
visa limitations. It was either go to tor-dev meeting or Bochum but not both.)

Here's the gist of my simple testing methodology:

https://gist.github.com/david415/9875821652018431dd6d6c4407bb90c0#file-detect_tor_network_partitions

Here's exactly how I performed the scan to get those results:

wget https://collector.torproject.org/recent/relay-descriptors/consensuses/2018-03-13-01-00-00-consensus

./helpers/query_fingerprints_from_consensus_file.py 2018-03-1
3-01-00-00-consensus > top100.relays


detect_partitions.py --tor-control tcp:127.0.0.1:9051 --log-dir ./ --status-log ./status_log \
   --relay-list top100.relays --secret secretTorEmpireOfRelays --partitions 1 --this-partition 0 \
   --build-duration .25 --circuit-timeout 60 --log-chunk-size 1000 --max-concurrency 100


echo "select first_hop, second_hop from scan_log where status = 'failure';" | sqlite3 scan1.db | wc -l
8942

echo "select first_hop, second_hop from scan_log where status = 'timeout';" | sqlite3 scan1.db | wc -l
23

echo "select first_hop, second_hop from scan_log where status = 'success';" | sqlite3 scan1.db | wc -l
935
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