Hi operators, for a couple of days, I see a little bit more than twice as much inbound than outbound connections on my (non-exit, non-guard) relay [0]. I have no real concern about this but I want to explain it to myself somehow.
As my relay has the HSDir flag, I started looking at the statistics: The graph for relays with HSDir flags went down by approx. 500 relays in the past days [1], but that’s pretty much traceable to a lot of relays updating from Tor 0.2.6.x to 0.2.7.x (there’s a similar behaviour around Nov 23rd [2] where the updates started as well as around June 08th [3] where updates from 0.2.5.x to 0.2.6.x started). On the other hand, the number of HSDir flags was fluctuating quite a lot looking at the year up to now [4] which never had this effect on my relay. After all, looking at the graphs in atlas (as well in arm) shows no significant (= something like twice as much) difference between the inbound and outbound traffic - so I’m scratching my head now. Another open question would be if HSDir connections are considered as in- or outbound. Up to now, I held the HSDir flag responsible for the slightly higher outbound traffic… So, again: Still no real concern from my side (as my relay is running fine - if it would be an attack, I would be able to feel that, right?), but I would like to understand what’s going on. :-) Maybe one of you here has an idea about this or experienced something similar. To all of you an early “happy holidays”! Cheers, Jannis [0] https://atlas.torproject.org/#details/8827944C4BDCBDAC9079803F47823403C11A9B7A [1] https://metrics.torproject.org/relayflags.html?graph=relayflags&start=2015-12-01&end=2015-12-19&flag=HSDir [2] https://metrics.torproject.org/relayflags.html?graph=relayflags&start=2015-11-20&end=2015-12-19&flag=HSDir [3] https://metrics.torproject.org/relayflags.html?graph=relayflags&start=2015-06-07&end=2015-06-30&flag=HSDir [4] https://metrics.torproject.org/relayflags.html?graph=relayflags&start=2015-01-01&end=2015-12-19&flag=HSDir
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