North American Network Operators Group

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Re: Can P2P applications learn to play fair on networks?

  • From: Sam Stickland
  • Date: Tue Oct 23 11:35:48 2007

Iljitsch van Beijnum wrote:
On 23-okt-2007, at 15:43, Sam Stickland wrote:

What I would like is a system where there are two diffserv traffic classes: normal and scavenger-like. When a user trips some predefined traffic limit within a certain period, all their traffic is put in the scavenger bucket which takes a back seat to normal traffic. P2P users can then voluntarily choose to classify their traffic in the lower service class where it doesn't get in the way of interactive applications (both theirs and their neighbor's).

Surely you would only want to set traffic that falls outside the limit as scavenger, rather than all of it?

If the ISP gives you (say) 1 GB a month upload capacity and on the 3rd you've used that up, then you'd be in the "worse effort" traffic class for ALL your traffic the rest of the month. But if you voluntarily give your P2P stuff the worse effort traffic class, this means you get to upload all the time (although probably not as fast) without having to worry about hurting your other traffic. This is both good in the short term, because your VoIP stuff still works when an upload is happening, and in the long term, because you get to do video conferencing throughout the month, which didn't work before after you went over 1 GB.
Oh, you mean to do this based on traffic volume, and not current traffic rate? I suspose an external monitoring/billing tool would need track this and reprogram the neccessary router/switch, but it's the sort of infrastructure most ISPs would need to have anyway.

I was thinking more along the lines of: everything above 512 kbps (that isn't already marked worse-effort) gets marked worse effort, all of the time.