code: func UpdateDestination(svc Service, dst Destination) error {
  	ic := &ipvsCommand{
  		Service:     newIPVSService(&svc),
  		Destination: newIPVSDestination(&dst),
  	}
  	return netlink.SendMessageMarshalled(C.IPVS_CMD_SET_DEST, family, 0, ic)
  }
docs: // UpdateDestination updates the specified destination in the IPVS table.