[tor-relays] Some Dir Authorities blocked

[Martin Kepplinger]

Am 17.09.2017 01:56 schrieb Roger Dingledine:
> On Sat, Sep 16, 2017 at 11:44:41PM +0000, dawuud wrote:
>> > Your only option would be to ask your ISP to uncensor the internet,
>> > unfortunately. Tor requires that all relays are able to contact all
>> > other relays, and those which cannot participate in the network.
>> 
>> I think you meant to say:
>> "Tor requires that all relays are able to contact all directory 
>> authorities"
> 
> Actually, no, we want it to be the case that all relays can reach all
> relays. The less true that becomes -- that is, the less clique-like
> the network topology becomes -- the more complicated the anonymity
> measurements become, and that is potentially quite bad.

What if the relay operator knows about her connectivity issues / 
censorship
and reflects that in her exit policy?

I thought that this would be best practice in such a case, and would not
hurt anonymity. (I don't know why :)

> 
>> Tor certainly does NOT require all relays can contact all relays.  In
>> fact, the network is *very* partitioned... but as of the past few
>> months I haven't put any energy into proving this; although I do have
>> some mostly finished twisted python code to make all two hop tor
>> circuits and records circuit build failures and circuit build 
>> timeouts.
> 
> This is a great research area that it would be good to see some
> attention for.
> 
> In particular, if there are specific relays that are doing especially
> poorly for connectivity, we should work with them to try to get them to
> fix it, and if it's unfixable, downgrade their weights and/or boot them
> from the network.
> 
> See also
> https://trac.torproject.org/projects/tor/ticket/12131
> ("Measure connectivity patterns between relays")
> and
> https://trac.torproject.org/projects/tor/ticket/19068
> ("Write and run a clique reachability test")
> 
> --Roger
> 
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