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Re: Why Tor is slow and what we're going to do about it

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Subject: Re: Why Tor is slow and what we're going to do about it
From: Juliusz Chroboczek <Juliusz.Chroboczek@xxxxxxxxxxxxxx>
Date: Mon, 16 Mar 2009 22:31:46 +0100
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In-reply-to: <20090313110658.GV14972@xxxxxxxxxxxxxx> (Roger Dingledine's message of "Fri\, 13 Mar 2009 07\:06\:59 -0400")
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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].

                                        Juliusz

[1] http://www.thefengs.com/wuchang/blue/CSE-TR-387-99.pdf
[2] http://www.pps.jussieu.fr/~jch/software/sfb/
[3] http://www.remlab.net/miredo/
[4] http://www.pps.jussieu.fr/~jch/software/ipv6-connectivity.html

References:
- Why Tor is slow and what we're going to do about it
  - From: Roger Dingledine

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