bittorrent

I know about NAT traversal and about STUN, TURN and ICE and its use. I want to know whether these are implemented in peer to peer file sharing application like bittorrent. Whether trackers facilitate peers behind NATs to communicate with each other by helping in creating direct connection using STUN or relay through TURN. In the case of Distributed Hash Table(DHT) how one peer would communicate with other peer behind NAT ? BitTorrent does not need to connect to any particular member in a swarm, it's not a p2p chat protocol where two specific end points want to talk to each other. All it cares

I'm trying to understand how can a magnetic link work, as I've read they use DHT and PEX to get the peers, but if I'm a new node in the network how can I find peers with only the hash of the file?! Doesn't it always require a link to a known host? Thanks The bittorrent DHT can be bootstrapped in many ways. It just needs the IP and Port of any other reachable DHT node out there. Current clients generally use several of the following strategies: bootstrap from a cache of long-lived nodes from a previous session use a DNS A/AAAA record mapping to a known node (e.g. router.bittorrent.com or dht

Are there any decent BitTorrent libraries for Java? I need to program a simple torrent client, but it would be great if I didn't have to write everything from scratch. jjnguy Snark by Three Rings is a very lightweight bitorrent library that will give you basic torrent features. Was originally written by Mark Wielaard. A github source can be found here https://github.com/akerigan/born-again-snark leonm Turn's TTorrent is a pure Java bit torrent library. Toilal I have created a Bitlet Fork on Github. It's LGPLed, and it's running faster than ttorent. Anonymous Azureus (now named Vuze ) gives you

I'm using C++ to parse the info hash of a torrent file, and I am having trouble getting a "correct" hash value in comparison to this site: http://i-tools.org/torrent I have constructed a very simple toy example just to make sure I have the basics right. I opened a .torrent file in sublime and stripped off everything except for the info dictionary, so I have a file that looks like this: d6:lengthi729067520e4:name31:ubuntu-12.04.1-desktop-i386.iso12:piece lengthi524288e6:pieces27820:¡´E¶ˆØËš3í ..............(more unreadable stuff.....).......... I read this file in and parse it with this code:

For the first time I used a magnet link . Curious about how it works, I looked up the specs and didn't find any answers. The wiki says xt means "exact topic" and is followed by the format ( btih in this case) with a SHA1 hash. I saw base32 mentioned, knowing it's 5 bits per character and 32 characters, I found it holds exactly 160bits, which is exactly the size of the SHA1. There's no room for an IP address or anything, it's just a SHA1. So how does the BitTorrent client find the actual file? I turned on URL Snooper to see if it visits a page (using TCP) or does a lookup or the like, but