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| About site: Internet/Protocols/NNTP - mcntp |
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| About site: http://mcntp.sourceforge.net/ |
Title: Internet/Protocols/NNTP - mcntp Freely available implementation of Usenet news via multicast.
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mcntp: Multicast NetNews Transfer Protocol[ Download mcntp ][ Mcntp Project Pages at sourceforge.net ][ What does it consist of? ][ How to use it? ][ Features ][ More information ]Newsmcntp-1.2 has been released after three months of development.Check the Download section on SourceForge for it. Jörg Dorchain has joined the mcntp development team. Jörg will take careof the move to OpenSSL.mcntp - Transport of NetNews over IP-MulticastWhat is it?Mcntp is a (Usenet-)news transport protocol and its implementation.The difference between mcntp and nntp is that with mcntp, articles are transferredover IP-multicast (which uses UDP) and not via TCP. Thus articles thatare sent by one sender once can be received by multiple receivers: So articles need only be sent once to reach all n receivers as shownin the above graphic. The result in the above example is that on theline from sender to the routers, the bandwidth needed is only one nthrelative to sending the article to all receivers separately. What does mcntp consist of?The mcntp software consists of three parts: A directory server (yawgmoth):This one coordinates the relationship between news- and multicast groups.The server sends its announcements on IANAassigned port 5418 and into multicast group mcntp-directory.mcast.net(224.0.1.51). A multicast sender (mcxmit):This one gets its articles from the filesystem and sends them over IP-multicast. A multicast receiver(mcrcv):This one receives articles that have beensent over IP-multicast and feeds them to a nntp server.The next figure will show how this might look in practical use.How to use it One sender host has one or more sender processes running that distributenews. In addition, a directory server is running which tells thesenders what multicast groups to use and which then distributes thislist to a special multicast group. Receivers listen to that group andif they want, they select an appropriate multicast group to receivearticles from it. These articles are then fed to a nntp server (whichneed not be on the same host as the multicast receiver). If thenntp server is not available, articles can be spooled to disk and fedto the server (by an external program such as rnews) when it is available again.FeaturesArticles can be compressed by using zlib to reduce bandwidth usefurther. It has been shown that the packets that are sent to the netare about 60% of the size of the original articles. In order to prevent injection of forged articles withoutleaving traces, articles are digitally signed before transport.At the moment only articles that are smaller than 64kBytes in size canbe transmitted via mcntp, as UDP packets can not contain more data.For practical use it is better to reduce the maximum size to about 20kBytes as many systems can not reserve such large socket buffers orhave problems due to bad implementations with packets larger than32kBytes. At first this sounds not good, but research hasshown that over 90%of all articles are less than 32kBytes in size. Tests that have been done in cooperation with Loral CyberStar (formerly Orion Network Systems)have shown that mcntp can also be used todistribute NetNews over Satellite. Here are some of the results and config hints.Sourceforge project pageThere is a Project pageat ![[SourceForge Logo]](http://sourceforge.net/sflogo.php?group_id=31774 "[SourceForge Logo]") . Everyone is invited in participating.This can be done in various forms:Providing patchesSending bug reportsWorking as a SF developer on one of the open sub projectsPorting to other operating systemsMore?Browse through the mcntp CVS repositoryThere exist two mailing lists aboutmcntp.Mcntp runs already on these listed platforms.Some further reading including mythesis as HTML version and manual pages.Here is a little How To to show the stepsthat are needed to send and/or receive News with mcntp.Look at this page for information about the usedRSA libraries.At 40. IETF meeting in Washington a BOF took place to find out weather a IETF working group shouldbe founded to standardize a Multicast NetNews Protocol (mnnp).Where to get it?Please look at thedownload pageofthe mcntp projectpages on SourceForgeMcntp is hosted on Homepage of Heiko W. Rupp (pilhuhn)$Id: index.html,v 1.36 2002/05/03 10:53:34 pilhuhn Exp $ |
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Freely | available | implementation | of | Usenet | news | via | multicast. |
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http://mcntp.sourceforge.net/
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Freely available implementation of Usenet news via multicast.
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