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a stupid naive question (lemmy.ca)

submitted 5 months ago by [email protected] to c/[email protected]

31 comments fedilink hide all child comments

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?

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[–] [email protected] 18 points 5 months ago (3 children)

That sounds weird and super invasive...where is this?

[–] [email protected] 8 points 5 months ago

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

[–] [email protected] 2 points 5 months ago (1 children)

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?

[–] [email protected] 4 points 5 months ago

They will usually block port 25 so you can't run a mail server. It's unusual for an ISP to block everything unless you are on CGNAT.

[–] [email protected] 22 points 5 months ago (2 children)

They're probably just using CGNAT.

[–] [email protected] 8 points 5 months ago

It's definitely not CGNAT. I have tested it using traceroute.

[–] [email protected] 9 points 5 months ago (1 children)

That's not a firewall though, which is what OP mentions.

[–] [email protected] 19 points 5 months ago (2 children)

Does OP really know exactly what technology at his ISP is preventing him from "opening ports"?

[–] [email protected] 5 points 5 months ago

Yes I know what's preventing me from opening ports. I also called my ISP they said we can't open the firewall so the incoming connections will be blocked.

[–] [email protected] 6 points 5 months ago (1 children)

Maybe not, but you and I definitely dont, so let's stick to what they're actually saying instead of guessing.

[–] [email protected] 3 points 5 months ago

You commented that it's "super weird and invasive" for an ISP to "firewall" listening ports. It just so happens that CGNAT also has the same effect and is super commonly used right now.

I think I'm good 👍