Rechnernetze Referat: Edonkey2000

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Referat: eDonkey2000 •Filesharing –Übersicht –FilesharingDienste •eDonkey –Übersicht –Funktionsweise –Client-Software –Server –Overnet 2003 Sven Keßler Filesharing: Definition File sharing is the public or private sharing of computer data or space in a network with various levels of access privilege. (…) File sharing allows a number of people to use the same file or file by some combination of being able to read or view it, write to or modify it, copy it, or print it. Definition von whatis.com FilesharingDienste • Napster • OpenNap [FileNavigator, Rapigator] • Gnutella [LimeWire, Morpheus, BearShare] • KaZaA (FastTrack) [Grokster, KaZaALite] • WinMX (WinMXPeer Network/OpenNap) • DirectConnect • Audiogalaxy • eDonkey2000 (ed2k) [eDonkey, eMule] eDonkey2000: Übersicht • Basiert auf MultisourceFile Transfer Protokoll •FilesharingProgramm, ohne zentralen Server •Client/Server Architektur •Peer-to-PeerFunktionsweise •jede Datei eindeutig identifizierbar (Hashing) •gleichzeitiger Download von mehreren Quellen •Wiederaufnahme abgebrochener Downloads •jede Datei kann getauscht werden eDonkey2000: Funktionsweise (1) eDonkey2000: Funktionsweise (2) •Client Z hat alle Teile der Datei 1 •Client W, X und Y wollen alle Datei 1 runterladen. •Client X und Client Y haben beide unterschiedliche Teile der Datei 1 •können unterschiedlichen Teile auch voneinander runterladen •schnellere Verteilung der Datei •Bandbreite von Z wird nicht überlastet •Client W kann nun die Datei runterladen (z.B. von Client Y) auch wenn die Upload-Bandbreite von Client Z (der ursprünglich die Datei zur Verfügung gestellt hat) ausgeschöpft ist. eDonkey2000: Funktionsweise (3) •Gleicher Text, letztes Zeichen "." durch "," ersetzt. •Gleiche Dateigröße •Gleicher Dateiname (wäre möglich) •aber unterschiedliche Hashwerte Client-Software: eMule0.26b eMuleunter GPL (www.emule-project.net) weitere Client-Software: •eDonkey2000 v0.44 (erster &"originaler" Client) •eMuleMods(z.B. eMulePlus, Tarod…) •MLdonkey(auch gnutella, Direct-Connect, etc) eDonkey2000 Server •Linuxund Windows Versionen •Server ist Plattform zum Suchen –Indexserver (vgl. mit einem Telefonbuch) •auf Servern sind keine Dateien •liefert Suchergebnisse zurück •eigentliche Verbindung zwischen Clients •eDonkeywürde auch ohne Server funktionieren –aber langsamer, keine Suchfunktion Overnet (NextGeneration eDonkey) •Serverloses Netzwerk •basiert auf eDonkey2000 Protokoll •benutzt das gleiche "Netz" wie ed2k •Clients verbinden sich untereinander •Clients tauschen Informationen aus mehr Infos: www.overnet.com Quellenangabe http://www.edonkey2000.com/documentation/ http://www.emule-project.net/ http://www.esel2k.org/ http://edonkey.bei.t-online.de/ http://www.techinv.com/directconnect-edonkey-kazaa/ http://www.mp3-world.net/ http://www.overnet.com.

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