On Sat, Jul 12, 2008 at 1:42 AM, Matthew Toseland <toad at amphibian.dyndns.org> wrote: > On Friday 11 July 2008 16:36, Daniel Cheng wrote: >> On Fri, Jul 11, 2008 at 10:03 PM, Matthew Toseland >> <toad at amphibian.dyndns.org> wrote: >> > On Friday 11 July 2008 04:23, Florent Daigni?re wrote: >> >> * Matthew Toseland <toad at amphibian.dyndns.org> [2008-07-10 16:55:23]: >> >> >> >> > On Thursday 10 July 2008 10:44, Florent Daigni?re wrote: >> >> > > * Matthew Toseland <toad at amphibian.dyndns.org> [2008-07-07 >> >> > > 12:17:33]: >> >> > > > 7. Automatic bandwidth limit calibration. (Toad) >> >> > > > >> >> > > > Several other p2p apps implement this, we should too. Bandwidth is >> > *the* >> >> > > > scarce resource most of the time, we want to use as much of it as > we >> > can >> >> > > > without significantly slowing down the user's internet connection > (see >> >> > > > above). >> >> > > >> >> > > I don't think that such a thing can reliably work. It might work in > 80% >> >> > > of the cases but will badly screw up in others. >> >> > >> >> > It works for other p2p's. What specifically is the problem for Freenet? >> > Small >> >> > number of connections? >> >> >> >> Small number of connections *and* usage of UDP! Do you know any p2p >> >> protocol which uses mainly UDP and does what you call "automatic >> >> bandwidth limit calibration"? >> >> >> >> E2k uses TCP, bittorrent uses TCP... As far as I know, only their links >> >> to DHTs use UDP (Kademilia); they don't use it for data transfert. >> > >> > Then how do they get through NATs? Are you sure your information is up to >> > date? >> >> Ed2k use kademilia and/or server to ask the peer to callback. They >> can't communicate if both side are behind NAT. (This is called "LowID" >> in ed2k world) >> >> Original BT just doesn't work behind NAT. Newer variant use UDP to ask >> for callback. > > You mean when one side is behind a NAT the other side uses UDP to ask it? Or > what?
BT have another P2P/UDP network using Distributed Hash Table (they simply call them "DHT" or "Distributed Tracker"). They use the DHT network to relay callback requests.
