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The route selection algorithm takes this into account - nodes with
exit traffic enabled are dramatically less likely to be used for
non-exit traffic. Eliminating it entirely could theoretically harm
anonymity by limiting the selection of middle nodes further and, more
importantly, by telling 3rd parties that every node contacting that
exit is going to be a middleman in someone's route. If the exit can be
used at any point in the chain, even if it is most likely as the
endpoint, that field can be widened dramatically.

Anyway, the point is, exit nodes will receive almost entirely exit
traffic by client selection anyway.

  - John Brooks

On Sun, Nov 2, 2008 at 6:50 AM, Erilenz <erilenz@xxxxxxxxx> wrote:
> If you run as an exit node, it's my understanding that you also act as a
> middleman node. Would it be possible, and would it be a good idea, to
> add an option such that you only act as an exit node?
> It seems a bit of a waste to use potential exit bandwidth as middleman
> relaying bandwidth when exit bandwdith is more scarce.
> --
> Erilenz