Assign an IPv6 address to Debian/Ubuntu

# The primary network interface
auto eth0
iface eth0 inet dhcp
iface eth0 inet6 static
address 2a04:2e00:1:c3::185.24.233.232/64
up ip -6 route add 2a04:2e00::19 dev eth0
up ip -6 route add default via 2a04:2e00::19
up ip -6 addr add 2a04:2e00:1:c3::1/64 dev eth0
up ip -6 addr add 2a04:2e00:1:c3::2/64 dev eth0