dmz                                                                                                                                                                                                                                            
     210.x.x.x/24                                                                                                                                                                                                                                                                                                                                       
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                       210.x.x.1                                                                                                                                   210.x.x.2                            
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                               web01                                                                                                                                       web02        
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                       172.x.x.1                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                        
                                                internal                                                                                                                                                                                                                                                                                                
                           172.x.x.x/24                                                                                                                                                                                                                                                                                                                 
                                                                                                                                                                   172.x.x.100                                                                                                                                 172.x.x.101                              
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                        db01                                                                                                                                        db02