[RulerOf]

Man... I typed that reply on my phone and dropped the ball formatting it lol.

> My understanding is v6 has two different autoconf schemes, DHCPv6 and a more "native" solution. Do these both always result in interfaces having multiple (routable) addresses?

The answer to that is "yes," but only insofar as DHCP is _not_ the norm for IPv6 networks. If you're planning to use DHCP to assign network addresses in an IPv6 range, you would run it in addition to using automatic configuration, and DHCPv6 would be responsible only for the "permanent" IPv6 address. Automatically-configured addresses (via RA with SLAAC or whatever) would still create the temporary address that you'd use for outbound internet connectivity, and the DHCP address hangs around for your use in DNS and for hosting "permanent" services like a webserver or whatever.

You've hit on one of the subtler problems of IPv6 being that it requires more things being let through the edge firewall[0], but given a stateful IPv6 firewall on the client side, the onus is on the hosting service's admin to ensure that works correctly (AFAIK).

[0]: http://shouldiblockicmp.com/