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Re: Can P2P applications learn to play fair on networks?
On Sun, 28 Oct 2007, Mikael Abrahamsson wrote:
If you performed a simple Google search, you would have discovered many universities around the world having similar problems.
In the mean time:
Second, we know based on experience that it won't work just to double our bandwidth. It won't work to triple our bandwidth (at triple the cost). Based on studies, we'd likely need to increase the bandwidth by a factor of ten or more. And based on our analysis of the traffic that is filling the ResNet pipe, we'd be buying that bandwidth to provide more access to file-sharing programs, not to meet academic needs.
Astronomic growth of P2P pegs Resnet bandwidth at whatever cap happens to be in place Good Users impacted as well as P2P users
http://www.denison.edu/offices/computing/policies/packet_shaping.html To make it even more difficult of a challenge, a number of popular applications like Kazaa, BitTorrent, and other "peer-to-peer" file sharing applications intentionally try to capitalize on all available bandwidth the system the software is running on has at its fingertips. If our internet traffic was not shaped to ensure equitable use a very small number of systems could easily clog our internet connection making it unusable.
TSS decided to up the campus bandwidth from 10 to 30 Mbps. That fall all the students returned and for some really strange reason, they ate up every bit of the old and new bandwidth. The rest of campus was crippled. The ResNetters were filling the 30 Mbps outbound pipe 24 hours a day, every day. [...] In December of 2001, TSS implemented a new scheme called packet-shaping, which looks at the types of traffic going through and only slows the traffic going to and from file-sharing programs.
And of course, if you still believe just adding bandwidth will solve the problems