Local Peer Discovery

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The Local Peer Discovery protocol is an extension to the BitTorrent file-distribution system. It is designed to support the discovery of local BitTorrent peers, aiming to minimize the traffic through the Internet service provider's (ISP) channel and maximize use of higher-bandwidth local area network (LAN).

Local Peer Discovery is implemented[1] with HTTP-like messages on User Datagram Protocol (UDP) multicast group which is an administratively scoped multicast address. While it is implemented in several clients (µTorrent,[2] BitTorrent/Mainline,[3] MonoTorrent,[4] libtorrent[5] and its derivatives, Transmission 2.0,[6] aria2 [7]) and implementation is very simple, no formal specification had been created as of December, 2009. Alternative multicast protocol extension is published as BEP 26.


  1. ^ "Protocol Design Discussion » Local Peer Discovery Documentation". 2009-10-30. Retrieved 2009-12-12. 
  2. ^ "Announcements » µTorrent 1.7 Release Candidate 6". 2007-06-28. Retrieved 2009-12-12. 
  3. ^ "BitTorrent User Manual". Retrieved 2009-12-12. 
  4. ^ "MonoTorrent 0.80". Retrieved 2010-05-05. 
  5. ^ "libtorrent manual: features". Retrieved 2009-12-12. 
  6. ^ "Changes : Transmission 2.00". 2010-06-15. Retrieved 2010-06-23. 
  7. ^ "Aria2 Manual: OPTIONS". Retrieved 2015-09-14.