@Baa IPv6 is a privacy issue because now you can easily identify every home using the public 64-bit (if the ISP is penny-pinching, 70-bit or more) address prefix as a super cookie, lifetime varies but originally designed to be permanent. Use the Web long enough, a random web shop data breach would eventually allow everyone to link aaaa:bbbb:cccc​:dddd:​:random to your phone number or home address. In comparison, IPv4 address is either CGNAT or pooled. I think this is still a very real problem, but it's the cost of getting stable server connectivity. The solution is VPN, Tor, dedicated broadband for servers, as usual. Ironically, mismanaged ISPs are doing pooled IPv6 prefixes like pooled IPv4, unintentionally providing enhanced privacy at the cost of random outage (if your router does not implement Flash Renumbering protection, OpenWrt didn't until 2026). In theory users should be able to freely opt-in/out prefix rotations, and all rotations would be planned via router announcement rather than a forced "flash" one. But one can dream.