internet                                
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                              router                     
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                             proxy                                                                                                                       
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                             app         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
     default                                                                                                                                                                             
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                         
                                                                                                                                                                                       db