[tor-relays] Decline in relays

[Felix]

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Am 23-Oct-17 um 15:32 schrieb David Goulet:
> Since July 2017, there has been a steady decline in relays from ~7k
> to now ~6.5k. This is a bit unusual that is we don't see often such
> a steady behavior of relays going offline (at least that I can
> remember...).
> 
> It could certainly be something normal here. However, we shouldn't
> rule out a bug in tor as well. The steadyness of the decline makes
> me a bit more worried than usual.

> That being said, I don't have an easy way to list which relays went
> offline during the decline (since July basically) to see if a
> common pattern emerges.
> 
> So few things. First, if anyone on this list noticed that their
> relay went off the consensus while still having tor running, it is
> a good time to inform this thread :).
> 
> Second, anyone could have an idea of what possibly is going on that
> is have one or more theories. Even better, if you have some tooling
> to try to list which relays went offline, that would be _awesome_.

a) Please find two pictures which show tap[1] and ntor[2] in 2016 and
2017 for a certain relay. Obviously the number of tap/ntor increases
since July 2017.

b) Taps becoming hourly massive on all my guards since October 2017.

c) An other relay had the largest amount of taps. It received 6
million taps. The tap flood took 65 minutes and the tor cpu power went
up from 60% before to 120-210% during the flood.

I can not prove but because of outbound packet abuse letters from an
ISP I start thinking if this is an other measure to damage guard/hsdir
flags. Beside the enormous consumption of cpu resources.

I hope this helps.

[TAP 1] https://i.imgur.com/jDj3M5W.jpg
[NTOR 2] https://i.imgur.com/jDncdMx.jpg

- -- 
Cheers, Felix
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