𝗠𝗲𝗴𝗮𝘁𝗵𝗿𝗲𝗮𝗱 needs to be updated
Chewy @ Chewy7324 @discuss.tchncs.de Posts 96Comments 1,006Joined 2 yr. ago
Chewy @ Chewy7324 @discuss.tchncs.de
Posts
96
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1,006
Joined
2 yr. ago
How can everyone on a private tracker maintain seed ratios above 1? Is it mathematically impossible?
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Attack of the week: Airdrop tracing – A Few Thoughts on Cryptographic Engineering
That's partially correct, partially wrong. An open port is required to allow for incoming connections for torrenting over TCP.
For TCP:
If a seed does not have an open port, a potential leech with an open port shares their IP & port with the tracker. The seed regularly asks the tracker for potential leeches. If the tracker provides a leech with an open port, then the seed connects to the leeches open port. This connection then allows the leech to download from the seed.
If neither of seed and leech has an open port, no connection can be established and thus no torrenting is possible.
For uTP/UDP:
If both peers (seed & leech) have no open ports, the tracker can use UDP hole punching to temporarily open up a port for the peers. The second peer can then connect directly to the first peer's port which has been opened up by the tracker.
This only works for public torrents and with PEX enabled. For private trackers an open port is required.