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> Cloudflare - which has been a great supporter of v6 for a long time now - has been known to send 'log in from a new IP address!' notifications because my machine automatically rotated it's IPv6 privacy suffix.

Either you get that message or the IPv6 privacy mechanism is not working well enough.

Well, all the IPv6 privacy mechanism does is rotate the /64 suffix. My /64 prefix hadn't changed. From a reputation/risk modelling standpoint, it's usually correct to view a /64 of v6 as a /32 of v4 (i.e. a single address).

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