Date: Thu, 26 Jan 2012 16:39:34 +0000 From: Steven Murdoch Steven.Murdoch@cl.cam.ac.uk To: tor-dev@lists.torproject.org Subject: Re: [tor-dev] Simulating a slow connection Message-ID: CAE309A8-034E-4E6A-B05C-6B9B3EA1CDBE@cl.cam.ac.uk Content-Type: text/plain; charset=us-ascii

Hi Adam,

On 20 Jan 2012, at 10:55, Adam Katz wrote:

...

Well, I myself didn't have anything specific in mind but i have some experience with the linux tc utility as well as with generating realistic background traffic. I was wondering whether I could help on any of the existing projects or help establish a new one.

I think Nick's comments summarized the current state of thinking. ExperimenTor and Shadow are the best Tor simulators to use for this project. The big missing pieces are:

• an automated framework for setting up experiments with slow Internet connections with ExperimenTor and Shadow, then collecting and summarizing results
• Tools for generating realistic link characteristics (delay and packet dropping), and for collecting data on the link properties found in particular locations

Steven.

As Steven stated, this would be very easy to explore with Shadow. The network topology is passed in as an XML file: node properties include bandwidth up/down and link properties include latency, jitter, and packetloss.

I already have some python scripts to generate topologies, and would be happy to share them once you have realistic measurements/values for the slow links you'd like to explore. I'd also be happy to explain more about how Shadow works or the structure of the XML file.

Rob