For those who want to try it at home:
ping 33333333
ping 55555555
I am sorry, two random Internet users in Korea and Germany, your IP addresses are simply special.
this post was submitted on 08 Jul 2025
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Very easy to solve - just make the entire IPv6 address space have low reputation. (/s)
Yes, by default they will all have to be. So if you want any internet, you will have to allow strangers to communicate to you. You will have to be not a savage about it. But you will also have to be able to block outright abuse. So IDS, IPban, dns blocking, anti fish proxy, client side certificate and "drop all" as the default firewall policy. And compared to nat4, you'll be opening ports rather than forwarding them.
All this except ids is already standard issue in openwrt.