michael.dillon@bt.com wrote:
NNTP, the historical firehose protocol, just floods it out to everyone who hasn't seen it yet but actually, the consumers of an NNTP feed have been set up statically in advance. And this static setup does include knowledge of ISP's network topology, and knowledge of the ISP's economic realities. I'd like to see a P2P protocol that sets up paths dynamically, but allows for inputs as varied as those old NNTP setups. There was also a time when LAN's had some form of economic reality configured in, i.e. some users were only allowed to log into the LAN during certain time periods on certain days. Is there any ISP that wouldn't want some way to signal P2P clients how to use spare bandwidth without ruining the network for other paying customers?
I think it's safe to assume that isps are steering p2p traffic for the purposes of adjusting their ratios on peering and transit links... while it lacks the intentionality of playing with the usenet spam/warez/porn firehose a little TE to shift it from one exit to another when you have lots of choices is presumably a useful knob to have. Layer violations to tell applications that they should care about some peers in their overlay network vs others seems like something with a lot of potential uninteded consequences.
--Michael Dillon
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