Re: [tor-relays] How to detect Tor exit IP addresses (was Re: [SOLVED] published descriptor missing from consensus)

[Scott Bennett <bennett@xxxxxxx>]

Roger Dingledine <arma@xxxxxxx> wrote:

> On Thu, Jun 08, 2017 at 05:30:37PM -0500, Scott Bennett wrote:
> >      Consider another case.  Users have often complained that running a tor
> > relay results in their IP addresses being blocked by all manner of services
> > around the Internet.  The providers of those services say they have suffered
> > attacks originating from tor relays.  The project's response was to create
> > an automatically, frequently updated list of IP addresses of exit relays and
> > make that list available for download by anyone wishing to block traffic from
> > tor exits, while allowing traffic from all other relays.  That list of
> > addresses suffers the same problem of not including alternative IP addresses
> > for those relays.  Even worse, troublesome connections from those alternative
> > addresses *can* be traced back, in some cases, to the exit relay.  Once those
> > services have identified the offending traffic as coming from a machine they
> > had been promised by the tor project would be in the downloadable list of
> > exit relay addresses, they may decide that they had been deceived by the tor
> > project, which could lead to many bad things in the future.
>
> I think we might have to agree to disagree about a lot of these topics,
> but I wanted to correct this one.
>
> The bulk exit list:
> https://check.torproject.org/cgi-bin/TorBulkExitList.py
> along with TorDNSEL is designed to handle exactly this situation, and
> it does it pretty well.
>
     Okay, I'll take your word for it, but I'm curious to know the source
of the addresses collected if tor doesn't report them.


                                  Scott Bennett, Comm. ASMELG, CFIAG
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