interface enp0s3 {
  AdvSendAdvert on;
  prefix 2001:db8:0:15::/64 {
    AdvOnLink on;
    AdvAutonomous on;
    AdvPreferredLifetime 900;
    AdvValidLifetime 1500;
  };
  AdvDefaultLifetime 1500;
  AdvOtherConfigFlag on;
};