[icedchai]

IP-based "privacy" is an illusion. With IPv4, your public IP (NAT router IP address) may not change for months, years, and possibly not until your change your router/MAC address. With IPv6 privacy extensions, your address changes regularly. This seems like an improvement.

[ninkendo]

> With IPv6 privacy extensions, your address changes regularly. This seems like an improvement.

Eh… If I was a company that wanted to use IP addresses to fingerprint users, IPv4 vs IPv6+privacy extensions both seem identical to me. Multiple requests from the same IPv4 address mean “someone, perhaps more than one person, from the same household/wifi”. Whereas multiple IPv6+privacy requests from the same /64 prefix means the same thing.

ie. You just consider the first 64 bits of the IP and can assume the same amount of information you already would assume from the IPv4 address. Just ignore the trailing 64 bits because it’s expected that they’ll be randomized/shuffled even from the same client.

[talent_deprived]

The IPv4 at my router yes. That's where tracking ends. IPv6 privacy is an illusion, try the test I described, remove IPv6 from your router at home, wait a few hours or few days, the family will complain search results are odd or messed up and that's only the beginning of it.

I don't know how companies are doing it but they are able to track your IPv6 changed daily or not.

[icedchai]

They probably just track the IPv6 /64. With prefix delegation, the /64 would rarely change, unless your provider delegated a new block. This is similar to your IPv4 router changing its address w/DHCP: it happens, but is relatively rare.

[Thiez]

Also just cookies and browser fingerprinting.