[Arnt]

Well, I have two consumer DSL connections at home from different ISPs with completely independent infrastructure (a few billable hours pays for a year's redundancy). Both of them behave give me new, unpredictable v6 prefixes via DHCP every 2h/1d.

So obviously not all other ISPs work the way yours does.

[crazy8s]

So, you are dependent on the ISP cooperating to give you privacy? What could possibly go wrong? Downvote me all you like guys. This just proved my point. NSA will love IPv6 adoption.

[Arnt]

Sure. We're dependent just like we were on IPv4, except that the ISPs' address pools are bigger. The same things can go wrong.

[samuelsmith]

That sounds a bit disingenuous. IPv4 was always on a forced rotation because a) limited address space and b) ISPs wanted to milk customers for static IP charges. IPv6 eliminates a). That leaves b) which isn't really a factor on mobile devices. It really is a permanent cookie if the ISP decides to implement it that way. I can't say I trust AT&T and Verizon after their 'header enrichment' shenanigans.

[Arnt]

What do those two ISPs on another continent have to do with my argument?