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What happens when I download the same torrent file using BitTorrent in two different pcs and using the same internet connection?

If I have two laptops and connect them to the same internet connection then download the same torrent file using a BitTorrent software, what do the trackers see? and how will the torrent software behave??

Let's say in Laptop A I start downloading the torrent file then after 30 minutes, I download the same torrent file on Laptop B.

Will the two laptop become peers and send each other data? Will Laptop B get data from Laptop A?

Will the trackers in the torrent file think that there is only one laptop/one peer trying to download the file?

Or will the tracker only see one public IP address since they are using the same internet connection?

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Nickolai Avatar asked Jul 11 '17 09:07

Nickolai


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1 Answers

Will the two laptop become peers and send each other data? Will Laptop B get data from Laptop A?

Assuming that two BitTorrent clients are behind the same NAT:

If the torrent is public (the private flag is not set) and both clients support Local Peer Discovery, they can find each other that way.

If the NAT support Hairpinning and preserve the same external and internal port for at least one of the clients, there is a good chance that they can connect to each other that way too.

Will the trackers in the torrent file think that there is only one laptop/one peer trying to download the file?
Or will the tracker only see one public IP address since they are using the same internet connection?

They will share the same IP. If the tracker can differ between them with the help of the port they connect from and the different peer_ids they use, depends on the specific implementation the tracker use.

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Encombe Avatar answered Sep 19 '22 23:09

Encombe