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In the original design of the Bit Torrent file sharing protocol, peers (users) in a file sharing group (known as a "swarm") relied upon a central computer server called a tracker to find each other and to maintain the swarm.
PEX greatly reduces the reliance of peers on a tracker by allowing each peer to directly update others in the swarm as to which peers are currently in the swarm.
The DHT is composed of nodes and stores the location of peers.
For each desired new peer one would look up a (uniformly) random key, and use the node responsible for the key as a new peer.
This is conceptually simple but would require quite some overhead.
Peer exchange cannot be used on its own to introduce a new peer to a swarm.
To make initial contact with a swarm, each peer must either connect to a tracker using a ".torrent" file, or else use a router computer called a bootstrap node to find a distributed hash table (DHT) which describes a swarm's list of peers.
A "peer" is a client/server listening on a TCP port that implements the Bit Torrent protocol.
A "node" is a client/server listening on a UDP port implementing the distributed hash table protocol.
the routing table is sufficiently populated via the bootstrap nodes). Emitted when the DHT gets an unexpected message from another DHT node.
Note that it is okay to do lookups before the 'ready' event fires.
since the mainline DHT can distribute load as necessary.
Each DHT node acting as a tracker may store only a subset of the peers, but these are maximal subsets constrained only by DHT node load rather than by a single peer's view.
Private torrents commonly disable the DHT, and for this case, PEX might be useful provided the peer obtains enough peers from the tracker.Tags: Adult Dating, affair dating, sex dating