Having built multi-Gbps nationwide ISP networks myself, I can tell you that going on an AS basis is useless.
If I have excess capacity to another ISP over a settlement-free peering link that comes out of the data center where I've homed the ATM traffic coming up from your DSL line, I'd much prefer that your BitTorrent client send lots of data to users of that ISP than send them to people on my network that are at the extreme other end of my national or international backbone net, perhaps over an ATM or MPLS tail that I pay burst charges for when you're doing that. P4P provides more data, assuming I'm willing to disclose those sorts of things to the public, but it still isn't sufficient *and* if I tell you I prefer that you get data from X but you find that you get the file you want in 1/20th the time by getting it from Y, I probably can't convince you anyway. Matthew Kaufman jul wrote: > P4P or pure AS caching. > > ~J > > On Dec 4, 2008, at 7:50 AM, [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> wrote: > >> P2P locality seems to me a red herring since most major ISPs: >> >> * have markets in several countries and geographic areas >> * lease physical facilities or IP networks from and to other >> ISPs; a very complex mapping >> * keep their L2 and L3 network maps and leasing costs very secret >> for competitive reasons. >> >> >> Having worked many years for a leading ISP with global reach, I guess >> locality would have seemed hard to define to our team. >> Unless the p2p protocol measures the latency, bandwidth and the >> number of IP hops itself. >> I have not seen any protocol that can also measure ownership of links >> by ISPs and numbers of hops between ISPs, their $$$ costs and >> populate the routing table with such metrics. >> Please share if you know such a technology. >> >> Henry _______________________________________________ p2p-hackers mailing list [email protected] http://lists.zooko.com/mailman/listinfo/p2p-hackers
