/interface gre6
add local-address=:: name=gre6-tunnel1 remote-address=2001:db8:be0:7501::1
/routing ospf instance
set [ find default=yes ] router-id=3.3.3.3
/ip address
add address=172.16.123.1/24 interface=ether4 network=172.16.123.0
add address=10.0.0.2/24 interface=gre6-tunnel1 network=10.0.0.0
/ipv6 address
add address=2001:db8:be1:6501::1 advertise=no interface=ether3
/ipv6 route
add distance=1 gateway=2001:db8:be1:6501::2
/routing ospf network
add area=backbone network=10.0.0.0/24
add area=backbone network=172.16.123.0/24