Exactly. I'm definitely not an IPv6 expert, but my (possibly wrong) understanding is that you'll never really get anything smaller than /64 (it's not a temporar

Exactly. I'm definitely not an IPv6 expert, but my (possibly wrong) understanding is that you'll never really get anything smaller than /64 (it's not a temporary thing during IPv6 roll-out). Sure, your assigned IPv6 block might be changing, but AIUI it should be less frequent than in IPv4, not more. (It's one of the proposed advantages of IPv6, isn't it, that everyone could have a stable public address. Also, if you want to have IPv6 working even inside your LAN, you want your public prefix to be stable, I'd say.)