root@wr1043nd:~# cat /etc/config/radvd
config interface
        option interface        'lan'
        option AdvSendAdvert    1
        option AdvManagedFlag   0
        option AdvOtherConfigFlag 0
        option ignore           0

config prefix
        option interface        'lan'
        # If not specified, a non-link-local prefix of the interface is used
        option prefix           '2001:xxx:1f0b:xxxx::/64'
        option AdvOnLink        1
        option AdvAutonomous    1
        option AdvRouterAddr    0
        option ignore           0

config rdnss
        option interface        'lan'
        # If not specified, the link-local address of the interface is used
        option addr             '2001:xxx:1f0b:xxxx::/64'
        option ignore           1