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Re: Why Tor is slow and what we're going to do about it
Interesting. A couple comments.
1. The congestion control issues are interesting indeed. I really wish
I had some time to work on tor.
2. I'm not sure that user education is the way; better fairness within
tor's congestion control algorithms feels more promising to me. The TCP
community has done quite a bit of research about per-aggregate fairness of
congestion control; my favourite algorithm happens to be Stochastic Fair
Blue [1,2], which is cheap and reasonably fair.
3. One point you fail to mention is the lack of NAT traversal in tor. I'm
sure it'd help if a tor relay could be run behind a NAT without the need to
manually punch holes.
Rather than developing our own variant of STUN, I'd recommend we simply get
tor to work over IPv6. Then a user will be required to run Teredo, which
is a NAT-punching protocol for tunnelling IPv6 over IPv4; it's built into
Windows since XPSP2, and available for Unix as Free Software [3,4].