Hello,

I am using qbittorrent for torrenting and my ISP has refused to open up firewall because of fucking “security” reasons. however I can still seed the torrent how is that possible? I mean all the incoming connections should be blocked right? isn’t it how firewall works?

31 points
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Stop using your ISPs router and they’re not going to have much control over it.

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21 points

no they have firewall enabled on their side so even if I use my own router it won’t do much.

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18 points

That sounds weird and super invasive…where is this?

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2 points

Who says the ISP isn’t blocking ports via a firewall?

I thought it was common practice for ISPs to block certain ports for residential connections?

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21 points

They’re probably just using CGNAT.

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8 points

Ipv4 shortage lead to a lot of IPS adopting CG-NATs where they are sharing one exit IPv4 for multiple end users and that’s why opening a port on the end user side won’t do a thing as your just opening a port in the ISP Network and not to the Internet

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7 points

Also in some places your ISPs can refuse to give you the PPPoE keys

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2 points

It sounds like everything is working, so… whats the issue?

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27 points
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however I can still seed the torrent how is that possible?

Yes you can still seed as well as download. But you are limited and can only upload and download torrent data in swarms that contain peers that are themselves fully connectable (port forwarded).

So say you join a torrent swarm that only contains peers just like you (firewalled, no ports forwarded) then no one will transfer any torrent data with each other. Everyone is stuck waiting for a fully connectable (port forwarded) peer to join that swarm.

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15 points

If the firewall just means no incoming connections, your computer can still reach out to the other side (if they open their port)

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2 points

Right, only one side of the connection needs an open port (and most clients will let that be either seed or leech side)… this is why having an open port on your end is useful if you’re downloading, since you can download from seeders that don’t have an open port.

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2 points
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