Does it matter if they rotate if you use prefix delegation with standard size?
Then again, the "typical" multi-user household is likely logged in to most things via SSO with Google or Facebook and probably has approximately zero fingerprinting mitigations in use so perhaps it isn't worth worrying about?
If you aren't the typical household then given 2^64 addresses and a Linux box serving as a router you've got quite a few options available. Including various creative reinventions of NAT that don't break basic functionality.
Why? With privacy extensions (which are normally enabled for user devices), then all someone can do is look at the prefix. This is identical to looking at the IPv4 address in a NAT setup, and it hasn't been that much of a privacy disaster.
As I see it, nothing is lost on that front.
It is not identical unless the OS uses a new IP for every new outbound connection. I believe that would qualify as a (very) nonstandard configuration.
> it hasn't been that much of a privacy disaster.
Indeed, it was tongue in cheek which is why I went on to point out SSO. The reality is most people aren't willing to sacrifice convenience to retain even a shred of privacy.
If you are one of the few who care then you can implement one of the many possible non-standard solutions.
If my PC uses the same IP as my partner's to talk to Google, it hardly matters for our privacy if they mix up the attribution of traffic between the two of us.
Granted any service that I consistently interact with is likely to be able to figure out at least some of that information if they put in some effort. But I don't want to be freely providing a complete picture for zero effort.
Creepy data aggregator stories pop up on the HN front page regularly so hopefully I don't need to explain why I feel this way.
Using the same IP for all of my devices, for me, generally falls into the same bucket of anti-fingerprinting techniques that are used by the Tor Browser like letterboxed resolution that I don't find practical for general use. If I want to actually prevent fingerprinting by IP, resolution, etc. then I'll actually use the Tor Browser.