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Bit Torrent Client Connectability: A Quick Question

post #1 of 10
Thread Starter 
I fully understand the need for a Bit Torrent client to be connectable - having an open incoming port enables leeches to initiate an incoming connection to a seed. However, I've been able to seed perfectly well without having my client be connectable on a specific forwarded port, and this is with me being the only seed.

Is this because a leech can somehow tell the seed to initiate the connection rather than the leech, or is it that UPnP takes care of this stuff automatically? Would it then be that my VPN provider has UPnP support at their end?

Many thanks. smile.gif
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post #2 of 10
UPnP and also the possibility of DHT.. depends on the client being used really as to what their capabilities are.
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post #3 of 10
Thread Starter 
@ardalista

Thanks for the reply. Wouldn't DHT also need a seed to be able to accept incoming connections?
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post #4 of 10
No it will just share what is has so far, even if you only have 50% of a file it will still share in the event someone else has the other 50%
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post #5 of 10
Thread Starter 
Let me reword that last question. Wouldn't DHT also need peers that were able to accept incoming connections?
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post #6 of 10
my understanding is DHT uses 'fingerprints' rather than file names.

you don't have to be sharing said file, but simply have it in a shared folder for it to be accessable.
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post #7 of 10
Thread Starter 
@Ardalista

But still, if Peer A has some data and Peer B wants it, how does Peer B get data from Peer A if Peer A has no accessible ports?
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post #8 of 10
Seeders will connect to leechers just like leechers will connect to seeders. There's essentially no difference between the 2 other than seeders have the entire torrent and their client probably won't be as aggressive to connect to new peers as leechers.

Both seeders and leechers are just considered "peers". Leechers can download from other leechers as well.

If user A only accepts outgoing connections (closed/unforwarded NAT), he can connect to user B, but not C, since B accepts both incoming and outgoing connections (open NAT), but C only accepts outgoing connections as well.
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post #9 of 10
bodgy firewall? or there is a port thats been opened.. again upnp
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post #10 of 10
Thread Starter 
@Ardalista, gonX

This is exactly my point. If I was using my router as the gateway, then yes UPnP would automatically take care of it. However, I'm torrenting over a VPN. The VPN provider forwarded a port on my behalf, but I didn't bother telling my torrent client to use that port to accept incoming connections (my client was set to a totally different port), yet I was able to accept incoming connections and seed as normal.

The only practical difference that I could see between using the forwarded port and NOT using the forwarded port is that a tracker would report me as "connectable" or not. Actual seeding (with me as the only seed) was totally unaffected either way, hence my lack of understanding.

The only thing I can think of is that my VPN provider operates a UPnP daemon at their end, but if that was the case, wouldn't the tracker report me as "connectable"?
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