raspberrypi:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
	hostname raspberrypi

iface eth0 inet6 manual
	pre-up echo 1 > /proc/sys/net/ipv6/conf/eth0/accept_ra && echo 2 > /proc/sys/net/ipv6/conf/eth0/use_tempaddr

raspberrypi:~# ip -6 route
2001:db8::1:0/125 dev eth0 metric 1 pref medium
2001:db8:1::/64 dev eth0 proto kernel metric 256 expires 5851sec pref medium
fd00::/64 dev eth0 proto kernel metric 256 expires 5851sec pref medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium

otherbox:~# ip -6 route
default from 2001:db8:1::/64 via fe80::200:ff:fe00:0 dev eth0  metric 512
default from fd00::/64 via fe80::200:ff:fe00:0 dev eth0  metric 512
2001:db8:1::/64 dev eth0  metric 256
fd00::/64 dev eth0  metric 256
fe80::/64 dev eth0  metric 256
ff00::/8 dev eth0  metric 256