[BitTorrent] Re: Trackerless BitTorrent

Johan F mllist at vaste.mine.nu
Sat Jan 1 21:44:54 EST 2005

 > With the tracker not only will you get a list of 50 unique peers,
 > but those will also be widely spaced across the network. This *cannot*
 > be done by peers telling each other about other peers.

It can be done, but it's expensive. E.g. create a DHT overlay and then 
search for a random key, and get the peer supposed to store the key. A 
random peer. Do n times for n peers. Overhead: usually around n*log N. 
(Where N is the size of the swarm and n still the number of desired 
peers.) A damn lot more expensive than getting from a tracker though.

Might still be feasable though, since it's "cheap" bandwidth that's used 
(peer bandwidth vs tracker bandwidth). Surely there are smarter, more 
effective and specialized systems.


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