LPD (Local Peer Discovery)

A multi-protocol & multi-source, cross platform download utility

Brought to you by: antbryan, phasenoise, rossta, t-tujikawa

#168 LPD (Local Peer Discovery)

Status: closed

Owner: nobody

Labels: None

Priority: 5

Updated: 2012-09-28

Created: 2010-02-01

Creator: pp_mad

Private: No

Aria2 is one of the best downloaders but it can be improve to work "on a group"...:

Using several Aria2C in same LAN, it will be extremely usefull to add LPD protocol to Aria2c.,compatible with uTorrent .
Info on http://www.superjason.com/archive/2007/08/14/local-peer-discovery-best-new-utorrent-feature.aspx
and http://www.bittorrent.com/btusers/guides/bittorrent-user-manual/appendix-bittorrent-mainline-interface/preferences/bittorrent#Basic_BitTorrent_Features.Enable_Local_Peer_Discovery.

It's a key feature when you have more than 1 PC in same LAN that are downloading same file (at same time or in different time frame).

Thanks for your efforts!

Discussion

tujikawa - 2010-02-02

It looks like utorrent uses broadcast to detect LAN peers. Is there its specification? Or is it closed?

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pp_mad - 2010-02-03

Good question... I really don't know.
Looking at wiki says that "is used by utorrent, bittorrent simple but no formal specification.."
http://en.wikipedia.org/wiki/Local_Peer_Discovery

I will try to look for more information on that...

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pp_mad - 2010-02-03

uf... I can find only this forum topic about LSD (Local Service Discovery) and propossal fo rnew "ZeroConf " for libtorrent:
http://forum.bittorrent.org/viewtopic.php?id=42

The libtorrent "seems to be" code:
http://libtorrent.svn.sourceforge.net/viewvc/libtorrent/trunk/src/lsd.cpp?revision=4029&view=markup
(nothing for uTorrent found)

And the IP address seems to be for multicast :
http://tools.ietf.org/html/rfc2365

....

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pp_mad - 2010-02-03

one more.. I see that BEP14 is missing:
http://bittorrent.org/beps/bep_1000.html

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tujikawa - 2010-02-04

Thank you for the info.
LPD has not been documented publicly.
libtorrent implementation will help to understand the behavior of LPD.

I also found this page from wikipedia.
http://forum.utorrent.com/viewtopic.php?id=63567

It seems very simple protocol.

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pp_mad - 2010-02-09

Yes, I see that it does not have a public doc... hope is so simple as you say that it can be added without much difficulties...

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tujikawa - 2010-02-20

Added local peer discovery in svn trunk. It will be available in 1.9.0.

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pp_mad - 2010-02-22

Thanks! good news, I will try it!

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tujikawa - 2010-03-12

1.9.0 has LPD support.

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