ipv6 and freebsd

[gahn]

Hi all:
 
Free questions with FreeBSD and IPV6. I am running 7.1.
 
1) My machine has multiple interfaces and some of interfaces I would like to run IP v6 but not all of them. How could I do that? Currently "ipv6_enable="YES" enables every interface of this machine, and "ipv6_network_interface="fxp0"" doesn't seem to do anything.
2) I have a router that is running IPv6 router-advertisement. How could I run autoconfiguration mode on the interface of my FreeBSD machine?

Thanks.