Peer-to-Peer Networks Status th Week
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1 Peer-to-Peer Networks Status th Week Department of Computer Science 1
2 Peer to Peer Networks Situation
3 Internet Traffic
4 Main Protocols 2004 Main protocols edonkey BitTorrent FastTrack Gnutella 4 4
5 P2P Share June 2004 Source: CacheLogic 5 5
6 P2P Share Germany 2007 Source: Ipoque
7 P2P Systems Germany 2007 by Volume Source: Ipoque
8 What Germans Download 2007 by Volume Source: Ipoque
9 Global Internet Traffic 2007 Ellacoya report (June 2007) worldwide HTTP traffic volume overtakes P2P after four years continues record Main reason: Youtube.com P2P 37% gaming 2% non-http video streaming 3% Newsgroups 9% VoIP 1% rest 2% HTTP 46% 9 9
10 Popular P2P Networks Gnutella 1+2 Kazaa / Fastrack Mule / edonkey / Kademlia WinMX DC++ / DirectConnect Azureus / BitTorrent Less popular Ares Soulseek Mute - based on Ant Colony algorithm Freenet 10 10
11 Gnutella 2 Hybride structure nodes with high bandwidth become P2P super nodes super nodes provide P2P network like original Gnutella normal nodes connect to the super nodes as clients Used in FastTrack, Gnutella 2, Skype Advantage improved scalability, lower latencies Disadvantage clients can try to disable super node ability scalability limited 11 11
12 FastTrack Designed by Niklas Zennström, Janus Friies, Jaan Tallinn 2001 authors of Skype (P2P-Internet- Telefonie) Hybride P2P Network Super nodes with special tasks Software detects super node ability - e.g. no NAT server, more bandwidth, good network connection super node for lookup download by HTTP - from client to client (P2P) Software not open source official client contains malware client super node communication investigated by reverse engineering - malware free clients available (Kazaa lite) - clients provide no supernode features comunication between super nodes still unknown Ares by the same developers similar network - client: Ares Galaxy 12 12
13 E-Donkey Client server index structure Server - special server software e.g. Lugdunum, satanedonkey-server - provide upload - store index information Clients - several software clients - e.g. emule, Shareaza, MLDonkey, edonkey2000, Hydranode, Morpheus,... - allow downloads from multiple other clients - some clients provide mechanisms for fair sharing Discussion vulnerable for attacks - e.g. law enforcement, denial of service - in Feb 2006 Razorback2 server was confiscated by the Belgian police Napster like P2P network Sucessor Overnet was eliminated 2006 protocol still in use by a botnet 13 13
14 Napster Sucessors OpenNap Napster clone - by reverse engineering of Napster communication adds chatting tool several clients available star topology as in Napster WinMX started as OpenNap client adds hash code to Napster clone in 2001 most successful P2P network in Japan 2005 server farm was deactivated - and moved to Vanuatu Soulseek Napster like system adds features like - interest groups - chatting - wishing list allows only single server 14 14
15 Direct Connect Client-server network for indexing by NeoModus Inc. server provide channels channels can be secured by passwords - loophole against copyright laws clients connect to server and transfer data directly from peer to peer very popular in Scandinavia Server is bottleneck Client software DC++, MLDonkey, NeoModus Direct Connect, ShakesPeer,... Hub software Direct Connect Hub link, Hexhub, Open Direct Connect Hub, PtokaX,
16 Skype Usage VoIP, video, chat, file transfer, audio and video conferences aims at a legal and free peer-to-peer communication platform Hybride Peer-to-Peer Network with super nodes by the creators of Kazaa Client-sever network for authentification and registration Obscurity layers software encoded communication encoded, possibly readable by Skype Reverse engineering of Skype failed so far Little information by Skype about internal structure privacy control security Popularity wide spread in private use companies and organizations are reluctant to grant the usage of Skype - because of security concerns 16 16
17 Legal Situation IAAL*: What Peer-to-Peer Developers Need to Know about Copyright Law, Fred von Lohmann, 2006 Direct Infringement end users share files without authorization of the copyright owner Secondary Infringement P2P tool maker Inducement - if copyright infringement by third party is supported by the tool - with intent Contributory infringement - knowingly contributes to another s infringement Vicarious Liability - direct infringement by somebody - and right and ability to control by tool maker - and direct financial benefit Defense strategies no direct infringement: All users are innocent software capable of substantial non infringing uses safe harbors for online service providers - notifies users of a policy to terminate accounts of infringers - copyright agent for legal notices - must act after notice - must not know about infringements - must not receive direct benefits from infringements 17 17
18 Companies using P2P Bittorrent, Kazaa Skype Microsoft, Intel, Sun Velocix, StratVantage, Loudcloud, Quiq, NextPage, Consilient, Sharman Networks, BlogAds, Octoshape, Joost, BigChampagne, Collanos, Vudu,... ISPs and networking companies like Verizon, France Telecom, Pando, Norwegian Telecommunication... investigate possible usages of P2P networks 18 18
19 Companies & Organizations Fighting P2P Users Fighting copyright regulations, e.g. Copyright Solutions - Blackwidow - P2P monitoring systems - monitors several systems Evidenzia - monitors Bittorrent and emule index files RIAA (Recording Industry Association of America) IFPI (International Federation of Phonographic Industry) Digital File Check - program disables P2P Networks legal actions against P2P servers and users Law Attorneys bulk legal notices ( Abmahnwelle ) search file-sharing networks for specific contents and send legal notices threatening law suits Internet Service Providers curb peer-to-peer traffic e.g. Comcast & Bell, Canada using deep packet inspection (DPI) Anagram inc. - by Lawrence Roberts - P2P traffic detection (without DPI) 19 19
20 Problems of Copyright Enforcement Automated detection and law enforcement Catherine Rampell, How It Does It: The RIAA Explains How It Catches Alleged Music Pirates, Blackwidow from Copyright Solutions - Evidenzia Log in as fake user and collect IP addresses from other peers Problem: False positives Michael Piatek, Tadayoshi Kohno, Arvind Krishnamurthy, Challenges and Directions for Monitoring P2P File Sharing Networks or Why My Printer Received a DMCA Takedown Notice provoked RIAA accusation by peers blackmailing non-active ( innocent ) IP addresses 20 20
21 Picknick at the Hochburg Friday , 2 pm Departure 13:56 Metro station Freiburg-Messe Arrival 14:37 Metro station Kollmarsreute Hiking trip to Hochburg Arrival approx. 16:00 Picknick at the Hochburg Order drinks on the forum Delivered by car Bring your own food Later: hiking trip back to Kollmarsreute Picknick auf der Hochburg Wanderung Bahnhof Kollmarsreute Treffpunkt :
22 Peer-to-Peer Networks End of 13th Week Department of Computer Science 22
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