On Tue, Jul 19, 2011 at 12:30:34PM -0400, Roger Dingledine wrote:
If you want to play around with a new feature, you might upgrade to 0.2.2.30-rc and set the PerConnBWRate and PerConnBWBurst torrc options, e.g. to 100KB and 5MB respectively. That should make the bandwidth you provide more fair without hurting most users.
Another option would be to simply upgrade to 0.2.2.30-rc. The new branch has a feature to try harder to prevent users from using you as a one-hop proxy -- that is, you won't allow a circuit from a non-relay to exit from you.
If in fact this person is using Tor in this way (which requires a modified client), upgrading should automatically stop this behavior.
--Roger