I fail to understand the purpose of this document or of publishing it. The abstract promises three things: * a survey of P2P systems * a definition of a P2P system * a taxonomy of P2P systems I found no traces of a survey, no actual taxonomy, and only an inadequate definition in the document. A survey would enumerate P2P systems and describe them. The document only mentions two P2P systems of which, one is universally known and the other is theoretical at present. Kazaa, or current #2 behind BitTorrent eDonkey, or the numerous academically interesting P2P systems are not mentioned, let alone described or classified. There's a section called "Taxonomy for P2P Systems", but it doesn't contain any taxonomy, for P2P systems or otherwise. Instead, it contains an attempted literature survey of P2P taxonomies. An actual taxonomy would list the types of P2P systems and their differentiating principles. It would be natural to combine it with a survey, classifying known P2P systems according to the taxonomy you choose. An unmarked paragraph four of Section 2 does provide a definition of a P2P system. A discussion follows it, but it's not clear if it's part of the definition proposed by the document. The definition is weak and generic, yet needs to be substantially stretched so that even BitTorrent, the most common P2P system in use today, fits it. The document is so bad that proposing specific textual changes is besides the point. Here's a sketch of an example of what a more useful document might look like: Definition: A distributed system implemented on a computer network to provide a service is called P2P if it involves a substantial number of nodes that, in addition to consuming the service, also provide it. These nodes are called peers. Note: P2P systems are often contrasted with client/server systems. In the latter, the functions of providing (servers) and consuming (clients) the service are separated into different nodes; in the former, the same nodes (peers) can do both. The distinction sometimes goes deeper and is reflected on the wire protocol level, where P2P protocols are symmetrical in nature, with both sides being able to issue the same set of messages. This, however, is accidental and not a defining part of P2P. Taxonomy 0. Type of service P2P systems can provide various services, such as file distribution and sharing; voice and video calling; audio and video streaming, recorded or live; data backup, etc. 1. Administrative control P2P systems can be under single administrative control, provide multiple realms each under its own administrative control, or be fully administratively decentralized. 2. Tracker P2P systems can include the use of a central server that can provide functions such as peer location and possibly extra services like content indexing. Other systems are trackerless and rely on DHTs and other techniques. 3. Peer equality P2P systems can contain peers that are elected to perform specialized functions, perhaps elevating these peers to near-server status, or all peers can have the same functions. Survey [Skipping the academic systems and only giving a couple of examples. An actual survey would need many more systems.] The global constellation of NNTP servers was arguably the first widely deployed P2P system. NNTP provides message exchange and a simple form of file sharing. NNTP was developed before the term P2P became common, and so the term is not normally applied to NNTP. However, on a technical level, if we exclude NNTP clients from consideration for a moment, NNTP servers form a P2P system, fully administratively decentralized, trackerless, and with equal peers. This system lacks self-organization and peer discovery, making it a very early precursor to modern P2P architectures. NNTP as a whole, with the clients, is obviously not a P2P system. Napster was one of the original P2P systems. It provided file sharing under single administrative control and with the use of a central tracker that also provided search. Peers in Napster were equal. Kazaa was also a file sharing service under single administrative control. It was trackerless and included a form of supernodes instead. Skype is one of the most popular P2P systems today and provides voice and video calling. It is under single administrative control, trackerless, and with supernodes. BitTorrent is one of the most popular P2P systems today and provides file sharing. It has multiple realms of administrative control, usually uses a tracker (but can be trackerless), and has equal peers. On Wed, Jul 22, 2009 at 12:26 PM, IAB Chair<iab-chair@xxxxxxxx> wrote: > > The IAB intends to publish the following document and invites any comments > you might have: > > > Peer-to-peer (P2P) Architectures > draft-iab-p2p-archs-02.txt > > Abstract > > In this document we provide a survey of P2P (Peer-to-Peer) systems. > The survey includes a definition and a taxonomy of P2P systems. This > survey also includes a description of which types of applications can > be built with P2P technologies and examples of P2P applications that > are currently in use on the Internet. Finally, we discuss > architectural tradeoffs and provide guidelines for deciding whether > or not a P2P architecture would be suitable to meet the requirements > of a given application. > > > > > Please provide your feedback before August 15, 2009. > > For the IAB, > > --Olaf Kolkman > IAB Chair > _______________________________________________ > IETF-Announce mailing list > IETF-Announce@xxxxxxxx > https://www.ietf.org/mailman/listinfo/ietf-announce > -- Stanislav Shalunov BitTorrent Inc shalunov@xxxxxxxxxxxxxx personal: http://shlang.com _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf