this post was submitted on 07 Mar 2025
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Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ
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IPv6. My stupid ISP actually shipped their router with all inbound ipv6 blocked with no way to unblock it, so I set up opnsense. Works like a charm!
At least your stupid ISP has IPv6. Mine doesn't (yet).
How does IPV6 makes port forwarding possible?
It's not v6 itself, it's rather lack of layers of nat that prevent forwarding a v4 for most folks.
Hmm, so no firewall in the router blocking ports, instead blocking happens on the actual client?
Port forwarding is necessary due to NAT not firewalls.
It's not that your router blocks new incoming connections at port X, it's that it does not know which local client it's meant for, since it's addressed to the public IP that is held by your router.
With IP6 it's lan client also gets assigned a public IP6 address (as there are plenty) and so the router receives a connection addressed to a Lan client and knows where to route it.
I'm very uneducated about this stuff. How does IPV6 fix that issue?
It doesn't fix it, per se, rather removes the need for layers of hacks such as nat and cg-nat. Every device gets a globally routable IP - no need to forward anything, just open the port you want.