Blocking TOR exit nodes?

  • Not sure how to do this.

    I should start by saying that I'm a believer in TOR, and have been known to dedicate real amounts of bandwidth to the project on occasion.

    However, I also run a reasonably busy forum and we are seeing more and more spammers appear from behind TOR exit nodes.

    Is there a simple way to block these users at the firewall?  Or at least get a measurement of how many users access via TOR exit nodes so I can understand how many would be inconvenienced by taking this sort of action?

    Thanks.  I'm sure I'm not the only one considering this.

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