On 2022-05-11 12:56 a.m., Andrei Borzenkov wrote:
Apparently you confuse privacy and temporary addresses.
No I'm not. From https://labs.ripe.net/author/johanna_ullrich/ipv6-addresses-security-and-pri... IPv6 Privacy Extension The IPv6 Privacy Extension is defined in RFC 4941. It is a format defining temporary addresses that change in regular time intervals; successive addresses appear unrelated to each other for outsiders and are a means of protection against address correlation. Their regular change is independent from the network prefix; this way, they protect against tracking of movement as well as against temporal correlation. Privacy addresses were created because of concerns the MAC based address could be used to track a mobile device. So yes, privacy addresses are temporary and you get a new one every day, up to 7, with the oldest discarded. Perhaps you're thinking of private addresses, which would be RFC1918 on IPv4 and Unique Local Addresses (ULA) on IPv6.