On Thu, Nov 27, 2014 at 2:22 AM, Gregory Maxwell <gmaxw...@gmail.com> wrote: >> Since this attack vector has been discussed, I started making some >> measurements on how effective it is to connect to Bitcoin using Tor, >> and I found that the number of connections dropping to near-zero is >> a situation which occurs rather frequently, which suggests that there >> is still room to improve on the DoS handling. > > I'm confused by this, I run quite a few nodes exclusively on tor and > chart their connectivity and have seen no such connection dropping > behaviour.
In my experience the problem has always been getting bootstrapped. Most nodes hardly give any hidden service nodes in their getaddr. (this has been improved in master by including a set of hidden service seed nodes) But this assumes -onlynet=tor. Tor with exit nodes should be less problematic, unless someone managed to DoSban all the exit nodes as described in the paper (but I've never seen such an attack myself). > Can you tell me more about how you measured this? > > [As an aside I agree that there are lots of things to improve here, > but the fact that users can in theory be forced off of tor via DOS > attacks is not immediately concerning to me because its a conscious > choice users would make to abandon their privacy (and the behaviour of > the system here is known and intentional). There are other mechanisms > available for people to relay their transactions than connecting > directly to the bitcoin network; so their choice isn't just abandon > privacy or don't use bitcoin at all.] Right, there's something to be said for splitting your own transaction submission from normal P2P networking and transaction relay. (esp for non-SPV wallets which don't inherently leak any information about their addresses) There was a pull request about this for Bitcoin Core one, maybe I closed it unfairly https://github.com/bitcoin/bitcoin/issues/4564 . Wladimir ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
