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The other eD2k client programs, given time, generally follow suit adopting these protocol extensions.ĮDonkey client programs connect to the network to share files. Examples of eD2k protocol extensions are "peer exchange among clients", "protocol obfuscation" and support for files larger than 4 gigabytes, etc.
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As eMule is open source, its code is freely available for peer-review of the workings of the protocol. However, the eD2k protocol is not formally documented (especially in its current extended state), and it can be said that in practice the eD2k protocol is what eMule and eserver do together when running, and also how eMule clients communicate among themselves. The original eD2k protocol has been extended by subsequent releases of both eserver and eMule programs, generally working together to decide what new features the eD2k protocol should support. Most notably, eDonkey2000, the original client by MetaMachine, closed-source but freeware, and no longer maintained but very popular in its day and eMule, a free program for Windows written in Visual C++ and licensed under the GNU GPL. There are many programs that act as the client part of the network. The eserver family is currently in active development and support, and almost all eD2k servers as of 2008 run this server software.
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There are two families of server software for the eD2k network: the original one from MetaMachine, written in C++, closed-source and proprietary, and no longer maintained and eserver, written in C, also closed-source and proprietary, although available free of charge and for several operating systems and computer architectures. The server part of the network is proprietary freeware. Like most sharing networks, it is decentralized, as there is no central hub for the network also, files are not stored on a central server but are exchanged directly between users based on the peer-to-peer principle. The eDonkey Network (also known as the eDonkey2000 network or eD2k) is a decentralized, mostly server-based, peer-to-peer file sharing network created in 2000 by US developers Jed McCaleb and Sam Yagan that is best suited to share big files among users, and to provide long term availability of files.
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Comparison of Internet Relay Chat clients.
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If you're technically minded, you can also use the info hash to bypass centralized torrent trackers and communicate directly with peers via a Distributed Hash Table (DHT).Peer-to-peer file sharing network Part of a series on Provides evidence if someone has tampered with the data. Verifies you're downloading the right data. Once the torrent hash has been made, it provides some key benefits for end-users: The hash is created by gathering specific information-such as file size, path, name, piece length, piece hashes, and privacy flags, then running it through a mathematical algorithm. SHA-1 hashes are 40 digits long (though you will also come across types of info hashes that are 32 or 64 digits). It is identical for all users and across all trackers.Īn info hash uses an SHA-1 cryptographic hash. It is best thought of as a unique ID for the torrent you are downloading.
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Otherwise, how does your torrent client know which bits to download from the P2P network? The downloaded parts arrive in small chunks from dozens of different users, then your computer pieces them back together again to make a single, usable file.īecause the file your downloading is so fragmented, there needs to be a reliable way to verify the contents. They do not require a central server in order to be operational.īehind the scenes, you are simultaneously uploading and downloading a file. Unlike regular web traffic (which connects to a central server to download a file or webpage), torrent downloads are decentralized via a peer-to-peer (P2P) network. To explain what an info hash is, we first need to take a step back and look at how torrents work.