This raises an interesting issue - should optimization of p2p traffic (P4P) be based on "static" network information, or "dynamic" network information. It's certainly easier for ISP's to provide a simple network map that real-time network condition data, but the real-time data might be much more effective. Or even if it's not real-time, perhaps there could be "static" network maps reflecting conditions at different times of day? Since P4P came up, I'd like to mention that the P4P Working Group is putting together another field test, where we can quantify issues like the tradeoff between static and dynamic network data, and we would love to hear from any ISP's that would be interested in participating in that test. If you'd like the details of what it would take to participate, and what data you would get out of it, please email me. Of course, independently of the test, if you're interested in participating in the P4P Working Group, we'd love to hear from you! - Laird Popkin, CTO, Pando Networks email: laird@pando.com mobile: 646/465-0570 ----- Original Message ----- From: "Alexander Harrowell" <a.harrowell@gmail.com> To: "Stephane Bortzmeyer" <bortzmeyer@nic.fr> Cc: nanog@nanog.org Sent: Tuesday, April 22, 2008 10:10:28 AM (GMT-0500) America/New_York Subject: Re: [Nanog] Lies, Damned Lies, and Statistics [Was: Re: ATT VP: Internet to hit capacity by 2010] Personally I consider P4P a big step forward; it's good to see Big Verizon engaging with these issues in a non-coercive fashion. Just to braindump a moment, it strikes me that it would be very useful to be able to announce preference metrics by netblock (for example, to deal with networks with varied internal cost metrics or to pref-in the CDN servers) but also risky. If that was done, client developers would be well advised to implement a check that the announcing network actually owns the netblock they are either preffing in (to send traffic via a suboptimal route/through a spook box of some kind/onto someone else's pain-point) or out (to restrict traffic from reaching somewhere); you wouldn't want a hijack, whether malicious or clue-deficient. There is every reason to encourage the use of dynamic preference. On Tue, Apr 22, 2008 at 2:54 PM, Stephane Bortzmeyer <bortzmeyer@nic.fr> wrote:
On Tue, Apr 22, 2008 at 02:02:21PM +0100, michael.dillon@bt.com <michael.dillon@bt.com> wrote a message of 46 lines which said:
This is where all the algorithmic tinkering of the P2P software cannot solve the problem. You need a way to insert non-technical information about the network into the decision-making process.
It's strange that noone in this thread mentioned P4P yet. Isn't there someone involved in P4P at Nanog?
http://www.dcia.info/activities/p4pwg/
IMHO, the biggest issue with P4P is the one mentioned by Alexander Harrowell. After that users have been s.....d up so many times by some ISPs, will they trust this service?
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