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A friend has set up a tracker for testing purposes. When he creates a torrent, I can open it in ordinary bittorrent clients and download/upload as usual. The tracker url in the meta info is in the form http://192.168.1.X/somefolder/announce.php

How can this work? Isn't that a local ip from within a LAN? Still my bittorrent client can find the tracker and communicate with it over the internet.

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probably the good address is not this one ;) it's definetly a local ip :) – ykatchou Nov 4 '10 at 14:39
Are you on the same network as your friend? – Matt Ball Nov 4 '10 at 14:39
Are you sure it can find the tracker and isn't using DHT? – thejh Nov 4 '10 at 14:40
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Yes, I see it's using DHT. I'm not completely sure how this impacts matters but I'll read up on it more before further questions. Thanks – JoGr Nov 4 '10 at 14:46
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2 Answers

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It seems to be using DHT which means that the peer lists are exchanged decentrally.

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Other than using DHT the meta info may simply contain an announce-list entry.

If an announce-list is present most Bittorrent clients will use trackers from that list and ignore the announce entry.

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