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Re: [tor-talk] Double-checking a couple questions about node churn rate

Thanks so much Karsten--this is awesome and exactly what I was looking for!

On 10/07/2014 07:04 PM, Karsten Loesing wrote:
> Hello Jeremy,
> On 08/10/14 00:57, Jeremy Gillula wrote:
>> I have a couple questions which I could probably find the answer to on
>> my own by writing up some scripts and doing a little research, but I
>> figured I'd ask here first in case anyone already knows the answer and
>> can take 30 seconds to reply:
>> 1. Does anyone have an idea of what the usual churn rate is for Tor
>> nodes? (I'm guessing fairly low for most nodes, but if anyone has even
>> rough numbers, that would help...)
> As one random starting point for your research, take a look at Figure
> 4.5 on page 83 (page 106 in the PDF, 2.9M):
> http://freehaven.net/anonbib/cache/loesing2009thesis.pdf
>> 2. How common is it for a node to change its exit policy and go from
>> being a relay-only node to an exit node (and vice versa)? If a node did
>> change, how quickly would that be reflected in Onionoo? (I'm guessing
>> the answers are rare and at most an hour after the change, respectively.)
> My *guess* is that this doesn't happen very often, but I don't have any
> numbers.  And yes, Onionoo should know it after at most two hours.
>> I realize these are vague questions, so even
>> order-of-magnitude-rough-guess answers would be appreciated!
> If you want to do some more analysis, fetch the latest consensus
> tarball(s) and write a script that compares contained fingerprints ("r"
> lines) for the churn question and exit policy summaries ("p" lines) for
> the exit-policy-change question:
> https://collector.torproject.org/archive/relay-descriptors/consensuses/
> Example:
> [...]
> valid-after 2014-10-08 01:00:00
> [...]
> r gabelmoo 8gREE9rC4C49a89HNaGbyh3pcoE VFtJRYsyCcBUlLVV6wow2hh/Y5g
> 2014-10-07 10:01:26 443 80
> s Authority HSDir Running Stable V2Dir Valid
> v Tor
> w Bandwidth=20 Unmeasured=1
> p reject 1-65535
> [...]
> Parsing libraries are available here:
> https://collector.torproject.org/#libraries
> If you have some interesting results, please feel free to share them here!
> All the best,
> Karsten

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