[tor-project] Analyzing bwauth disagreements

Tom Ritter tom at ritter.vg
Mon Oct 9 15:50:04 UTC 2017

On 9 October 2017 at 10:34, dawuud <dawuud at riseup.net> wrote:
> Hi Tom et al,
> I hope I'm not too far off topic here:


> I remember from the last tor-dev meeting there was some discussion
> about replacing the old torflow code with bwscanner a project that
> Aaron Gibson started and Donncha subsequently worked on. But since
> there I haven't heard of any progress on that.

No. AFAIK the code is still at
https://github.com/TheTorProject/bwscanner.git and waiting to be
tested. I intend to test it 'soon' (f a value of 'soon' that might
stretch into 4-5 months) and see how its results compare.

> Also I have recently done a few small scans for 2-hop circuit
> connectivity and shared some of the results with Roger on
> #tor-dev. One theory is that many of the circuit failures are due to
> traffic spikes at certain hours of the day.
> I was thinking that many of the relay to relay connectivity problems
> could be fixed by adjusting the consensus weights or capping their
> consensus bandwidth...  and that this scanning of "network partitions"
> shouldn't only be an interesting research project but should probably
> be a part of the bandwidth authority system.

I saw that! Or at least part of it! Awesome work!

> Meejah and I were planning to facilitate a workshop/discussion about
> these and other issues related to scanning the tor network. Are you
> coming to the meeting in Montreal?

No. Sorry. =/

Your proposal makes sense to me superficially for sure. I don't own
torflow really, I just try and help it keep limping along. I'm not
qualified enough to say it's a good idea or a bad idea, or how we
could measure its results or what. =)


> On Mon, Oct 09, 2017 at 07:59:39AM -0500, Tom Ritter wrote:
>> On 6 October 2017 at 15:40, Tom Ritter <tom at ritter.vg> wrote:
>> > Is my data correct? maatuska and moria being that close together is suspicious.
>> moria was completely missing, heh. Unfortunately trying to grapha ll
>> the data now gives me an out of memory error!
>> Here is a graph showing maatuska<->maatuska2 and maatuska<->moria.
>> They agree quite closely, much more than any other two bwauths, but
>> not identically.
>> https://raw.githubusercontent.com/tomrittervg/bwauth-tools/master/moria.png
>> It appears there's a single vote file in there that has incorrect data
>> and is throwing the scale off, but a) I like a larger scale and b)
>> trying to correct it would take me another day before notifying
>> everyone of the mistake.
>> -tom
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