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a stupid naive question
(lemmy.ca)
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this post was submitted on 24 Jun 2024
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no they have firewall enabled on their side so even if I use my own router it won't do much.
That sounds weird and super invasive...where is this?
They're probably just using CGNAT.
That's not a firewall though, which is what OP mentions.
Does OP really know exactly what technology at his ISP is preventing him from "opening ports"?
Maybe not, but you and I definitely dont, so let's stick to what they're actually saying instead of guessing.
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 👍
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.
It's definitely not CGNAT. I have tested it using
traceroute.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
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?
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.